References

R
Raab-Straube, E. von (2018) Sapindaceae. – In: Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity [link] (accessed 2020-02-26)
Rackham, O. (1986) The History of the Countryside, J.M. Dent, London
Rackham, O. (2006) Woodlands, HarperCollins, London
Radcliffe-Smith, A. (2001) Genera Euphorbiacearum, Royal Botanic Gardens, Kew
Rafinesque, C.S. (1836 to 1838) New Flora and Botany of North America, Philadelphia [link] (accessed 2024-05-15)
Raggett, J. (2018) Plant of the Day - Saturday 1 December 2018 [link] (accessed 2019-06-28)
Rahemi, A. R., Taghavi, T. & Dale, A. (2016) A Simple Method to Improve Hazelnut Grafting in Journal of Nuts 7:2 83-87
Raimondo, F.M. (2008) A new species of Malus (Rosaceae, Maloideae) from Sicily. in Flora Mediterranea 18 5-10 [link] (accessed 2020-05-29)
Raman, G. et al. (2023) Extensive characterization of 28 complete chloroplast genomes of Hydrangea species:a perspective view of their organization and phylogenetic and evolutionary relationships. in Computational and Structural Biotechnology Journal 21 5073-5091 [link] (accessed 2023-11-30)
Rammeloo, A. (2016) Emmenopterys henryi, International Dendrological Society [link] (accessed 2019-04-12)
Rana, S.K. et al. (2018) Determining bioclimatic space of Himalayan alder for agroforestry systems in Nepal in Plant Diversity 40:1 1-18
Ranney, T.G. et al. (2003) ×Schimlinia floribunda (Theaceae): a new intergeneric hybrid between Franklinia alatamaha and Schima argentea in HortScience 38 1198–1200
Ranney, T.G. & Fantz, P.R. (2006) ×Gordlinia grandiflora (Theaceae): an intergeneric hybrid between Franklinia alatamaha and Gordonia lasianthus in HortScience 41 1386–1388
Raoul, E.F.L. (1844) Choix de Plantes de la Nouvelle-Zélande in Annales des Sciences Naturelles; Botanique 3 113-123 t.2 [link] (accessed 2021-09-16)
rarepalmseeds.com (2024) Koelreuteria elegans subsp. elegans [link]
Raulston, J.C. (1986) Plants in the NCSU Arboretum: Cercis (Redbuds) in Friends of the NCSU Arboretum Newsletter 14 140–145
Raulston, J.C. (1987) Friends of the Arboretum Newsletter – June 1987 16 [link] (accessed 2022-02-24)
Raulston, J.C. (1987) Some uncommon plants recommended for trial from the NCSU Arboretum evaluations in Friends of the NCSU Arboretum Newsletter 16 178–186
Raulston, J.C. (1991) Styrax evaluations in the NCSU Arboretum in Proceedings of the Southern Nurserymen’s Association 36th Annual Research Conference 305–309 1991, Southern Nurserymen’s Association
Raulston, J.C. (1992) Styrax in American Nurseryman:November 1 23–36 November 1, 1992
Raulston, J.C. (1993) Lindera Evaluations in the NCSU Arboretum in Southern Nurseryman's Association Research Conference 38 359-362 [link] (accessed 2023-04-11)
Raulston, J.C. (1993) The Chronicles of the NCSU Arboretum, Privately published by J.C. Raulston, Raleigh
Raulston, J.C. (1994) 1993–94 Winter hardiness evaluations in the NCSU Arboretum in Proceedings of the SNA Research Conference 39 355–358
Raulston, J.C. (1996) The NCSU evaluation of Southwestern US and Mexico native plants in Friends of the Arboretum Newsletter 83–85 July 1996
Raulston, J.C., Fairey, J. & Schoenfeld, C. (1995) The NCSU Arboretum evaluation of Southwestern US and Mexico native plants in Proceedings of the SNA Research Conference 40 317–319
Raven, J.E. (2000) Plants and Plant Lore in Ancient Greece, Leopard's Head Press, Oxford
Ravenna, P. (2000) Nothofagus rutila sp. nov. and the correct author citation of N. nervosa (Fagaceae). in Onira 5:1 1-4
Ravenscroft, E. (1884) The Pinetum Britannicum: a descriptive account of hardy coniferous trees cultivated in Great Britain 1-3, W. Blackwood & Sons, Edinburgh
Ravindran, S. et al. (1997) Distribution and variation in mulberry germplasm in Indian Journal of Plant Genetic Resources 10:2 233-242
Ray, D., Pyatt, G. & Broadmeadow, M. (2002) Modelling the future climatic suitability of plantation forest tree species in Broadmeadow, M. (ed) Climate Change: Impacts on UK Forests 125 151-167, Forestry Commission Bulletin, Forestry Commission, Edinburgh
Ray go (2009) Malus spontanea Wikimedia Commons (accessed 2020-05-08)
Razdan, M.K. & Dennis Thomas, T. (eds) (2021) Mulberry: Genetic Improvement in the Context of Climate Change, CRC Press
Redgrove, H. (1985) Pink-leaved cedrela. in The Garden 110 344-45
Reed (2004) Floral characteristics of a Hydrangea macrophylla × H. paniculata hybrid. in Proceedings of the Southern Nursery Association Research Conference 49 580-582 [link] (accessed 2023-09-27)
Reed, S.M. (2004) Self-incompatibility and time of stigma receptivity in two species of Hydrangea. in HortScience 39:2 312-315 [link] (accessed 2023-09-27)
Reed, S.M. (2010) 'Ruby Slippers’ and ‘Munchkin’ oakleaf hydrangeas. in HortScience 45:12 1908-1909 [link] (accessed 2024-05-24)
Reed, S.M. & Alexander, L.W. (2015) ‘Queen of Hearts’ oakleaf hydrangea. in HortScience 50:2 310-311 [link] (accessed 2024-05-18)
Reed, S.M., Riedel, G.L. & Pooler, M.R. (2001) Verification and establishment of Hydrangea macrophylla ‘Kardinal’x H. paniculata ‘Brussels Lace’interspecific hybrids. in Journal of Environmental Horticulture 19:2 85-88 [link] (accessed 2023-09-27)
Reed, S.M. & Rinehart, T.A. (2009) Simple-sequence Repeat Marker Analysis of Genetic Relationships within Hydrangea paniculata in HortScience 44:1 27–31 [link] (accessed 2023-09-27)
Reese Næsborg, R. (2021) Calicium sequoiae: The IUCN Red List of Threatened Species [link] (accessed 2023-10-31)
Reeves, J. (2020) UT Gardens January 2020 Plant of the Month: 'Cayenne' Silky Dogwood [link] (accessed 2020-11-03)
Regel, E. (1883) Hedysarum multijugum Maxim. in Gartenflora 32 193-4 t. 122 [link] (accessed 2023-03-15)
Rehder, A. (1901) Notes of Hybrids of Quercus ilicifolia in Rhodora 3:29 137–140 Biodiversity Heritage Library (accessed 2022-12-29)
Rehder, A. (1903) Pterocarya fraxinifolia × stenoptera (hybr. nov.) in Mitteilungen der Deutschen dendrologischen gesellschaft:12 116 [link] (accessed 2019-06-28)
Rehder, A. (1907) Einige neuere oder seltenere Gehölze in Mitteilungen der Deutschen dendrologischen gesellschaft 16 69-76 [link] (accessed 2024-05-03)
Rehder, A. (1908) Einige neue oder kritische Gehölze in Mitteilungen der Deutschen dendrologischen gesellschaft 17 157-163 [link] (accessed 2024-05-02)
Rehder, A. (1910) A New Hybrid Cornus (Cornus rugosa × stolonifera) in Rhodora 12:138 121-124
Rehder, A. (1912) Neue oder kritische Gehölze in Mitteilungen der Deutschen dendrologischen gesellschaft 21 183-195 [link] (accessed 2024-04-19)
Rehder, A. (1917) The genus Fraxinus in New Mexico and Arizona in Proceedings of the American Academy of Arts and Sciences 53 199–212
Rehder, A. (1920) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum in Journal of the Arnold Arboretum 2 42-64 [link] (accessed 2020-04-24)
Rehder, A. (1920) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum in Journal of the Arnold Arboretum 2 42-62 [link] (accessed 2020-06-12)
Rehder, A. (1922) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum. in Journal of the Arnold Arboretum 3:4 207-224 [link] (accessed 2020-04-21)
Rehder, A. (1923) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum. 4 107-116 Journal of the Arnold Arboretum (accessed 2020-04-21)
Rehder, A. (1926) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum in Journal of the Arnold Arboretum 7 22-37 [link] (accessed 2020-05-08)
Rehder, A. (1926) NEW SPECIES, VARIETIES AND COMBINATIONS FROM THE HERBARIUM AND THE COLLECTIONS OF THE ARNOLD ARBORETUM in Journal of the Arnold Arboretum 7:2 144-149
Rehder, A. (1927–1940) Manual of Cultivated Trees and Shrubs Hardy in North America (and many reprints), The MacMillan Co, New York
Rehder, A. (1933) Acer sect. Macrantha. Pax emend. Rehd 14 211-222 in Journal of the Arnold Arboretum
Rehder, A. (1933) New species, varieties and combinations from the herbarium and the collections of the Arnold Arboretum in Journal of the Arnold Arboretum 14 199-222 [link] (accessed 2020-05-08)
Rehder, A. (1936) A New Species of Acer from Guatemala in Journal of the Arnold Arboretum 17 350-351
Rehder, A. (1936) A new species of Acer from Guatemala. in Journal of the Arnold Arboretum 17 350-351
Rehder, A. (1939) New Species, Varieties and Combinations from the Collections of the Arnold Arboretum in Journal of the Arnold Arboretum 20 409-431 [link] (accessed 2021-12-30)
Rehder, A. (1940) Manual of Cultivated Trees and Shrubs Hardy in North America (2nd Edition), Macmillan, New York
Rehder, A. & Wilson, E.H. (1927) An enumeration of the ligneous plants of Anhwei. in Journal of the Arnold Arboretum 8 169-173 [link] (accessed 2020-01-08)
Rehman, S. & Park, I-H (2000) Effect of scarification, GA and chilling on the germination of goldenrain-tree (Koelreuteria paniculata Laxm.) seeds 85:4 319-324 in Scientia Horticulturae [link]
Reich, L. (1996) Cornelian Cherry from the Shores of Ancient Greece in Arnoldia 56 2-7
Reich, L. (2021) Filbert Nuts of Hazelnuts? [link] (accessed 2023-02-03)
Reiche, K.F. (1903) Flora de Chile [in Spanish] 3, Santiago de Chile [link] (accessed 2023-06-13)
Reiche, K.F. (1911) Buddleia globosa in Flora de Chile 6 97-98 Part 1
Reid, C. (1913) The Relation of the Present Plant Population of the British Isles to the Glacial Period in Journal of Ecology 1:1 42-26 [link] (accessed 2021-01-21)
Reid, E.M. & Chandler, M.E.J. (1933) The London Clay Flora, British Museum (Natural History), London
Reid, W. (1861) Catalogue for 1861 of fruit and ornamental trees, flowering shrubs etc., New York
Reid, W. (2010 onwards) Northern Pecans [link] (accessed 2019-11-22)
Ren, B. & Liu, J, (2006) Cytological study on Alnus in China in Guihaia 26:4 356-359
Ren, B., Xiang, X. & Chen, Z. (2010) Species identification of Alnus (Betulaceae) using nrDNA and cpDNA genetic markers in Molecular Ecology Resources 10:4 594-605
Renner, S.S. (1999) Circumscription and phylogeny of the Laurales: evidence from molecular and morphological data in American Journal of Botany 86 1301–1325
Renner, S. S. et al. (2008) Rooting and Dating Maples (Acer) with an Uncorrelated-Rates Molecular Clock: Implications for North American/Asian Disjunctions in Systematic Biology 57:5 795-808
Restrepo, G. & Gervais, C. (1994) Chromosome numbers of some Latin American species of Alnus (Betulaceae) in Rhodora 96:885 69-74
Reveal, J.L. & Seldin, M.J. (1976) On the identity of Halesia carolina L (Styracaceae) in Taxon 25 123–140
Reyes-Diaz, M. et al. (2005) Low temperature responses of Nothofagus dombeyi and Nothofagus nitida, two evergreen species from south central Chile in Tree Physiology 25:11 1389-98
Reyes, O., Casal, M. & Rego, F.C. (2009) Resprouting Ability of Six Atlantic Shrub Species in Folia Geobotanica 44 19-29 [link] (accessed 2022-11-30)
Reyes, R. (2014) July 2014 Plant Profile: Hydrangea integrifolia [link] (accessed 2024-03-26)
Rhora's Nut Nursery (2023) Other Edible Nut Trees [link] (accessed 2023-02-11)
RHS (2020) Cornus kousa 'Summer Fun' [link] (accessed 2020-12-08)
RHS (2020) RHS Plant Finder, Royal Horticultural Society, London, UK.
RHS (2021) Cornus kousa 'Beni-fuji' [link] (accessed 2021-01-12)
RHS (2021) Cornus kousa var. chinensis 'Wisley Queen' [link] (accessed 2021-01-12)
RHS (2024) Find a plant [link]
RHS Trials Office (2010) TRIALS REPORT 2008-2010: Buddleja davidii and its close hybrids., Royal Horticultural Society, Surrey, UK [link]
Rice, A. et al. (2015) The Chromosome Counts Database (CCDB) – a community resource of plant chromosome numbers in New Phytologist 206 19-26
Rice, G. (2015) Abelia Sunny Charms [link]
Rice, G. (2018) Super late shrub adds a golden spring [link] (accessed 2024-07-21)
Rich, E. L. (2004) Investigation of Allelopathy in an Invasive Introduced Tree Species, Norway Maple (Acer platanoides L.), Drexel University, Drexel University
Rich, T.C.G. et al. (2010) Whitebeams, rowans and service trees of Britain and Ireland. A monograph of British and Irish Sorbus L. B.S.B.I. Handbook No. 14, Botanical Society of the British Isles, London
Rich, T.C.G., Harris, S.A. & Hiscock, S.J. (2009) Five new Sorbus (Rosaceae) taxa from the Avon Gorge, England in Watsonia 27 217–228
Rich, T.C.G. & Houston, L. (2006) Sorbus whiteana (Rosaceae), a new endemic tree from Britain in Watsonia 26 1–7
Rich, T.C.G. & Proctor, M.C.F. (2009) Some new British and Irish Sorbus L taxa (Rosaceae) in Watsonia 27 207–216
Richard, L.C.M. (1826) Commentatio botanica de Conifereis et Cycadeis, Stuttgardia
Richardson, D. (2012) Oaks of the Texas Big Country in International Oaks 23 76–82 International Oak Society (accessed 2023-05-16)
Richardson, D.M. (1998) Ecology and Biogeography of Pinus, Cambridge University Press, Cambridge
Richardson, K. (2020) Promise of Bark: Eucommia ulmoides. in Arnoldia 77:3 40 [link] (accessed 2023-01-04)
Richer, S. (2017) The site that slipped through the 'Lime Decline' net: A Holocene History of Tilia at Shrawley Wood, Worcestershire, UK in Quaternary Newsletter 141 46-7. [link] (accessed 2020-01-29)
Rickett, H.W. (1945) New combinations in Cornus in Bulletin of the Torrey Botanical Club 72 223
Riddelsdell, H. J., Hedley, G. W. & Price, W. R. (eds) (1974) Flora of Gloucestershire: phanerogams, vascular cryptogams, charophyta, The Chatford House Press Ltd, Bristol
Rieck, I. & Rieck, G. (2020 onwards) Pfingstrosen aus Bad Rappenau [link] (accessed 2020-09-30)
Riedel, P. (1957) Plants for extra-tropical regions, California Arboretum Foundation, Inc., Los Angeles
Rikli, M. (1902) Die Gattung Dorycnium. Bot. Jahrb. Syst. 1901, 31, 314–404 in Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie 31 314-404 [link] (accessed 2023-03-16)
Rink, G. (1990) Juglans cinerea L., Butternut in Burns, R.M. & Honkala, B.H. (eds) Silvics of North America 2 386-390, Agriculture Handbooks (No. 654), USDA Forest Service, Washington, DC [link] (accessed 2019-10-01)
Rios, J.L. & Waterman, P.G. (1997) A review of the pharmacology and toxicology of Astragalus. in Phytotherapy Research 11:6 411-418 [link] (accessed 2023-02-14)
Ritter, M. (2012) Striving for Diversity: Fragrant Champaca in Pacific Horticulture April 2012 [link] (accessed 2021-10-06)
Rivers, M. et al. (2015) Conserving the World’s Most Threatened Trees: A global survey of ex situ collections, BGCI, Richmond, UK.
Rivers, M. et al. (2016) The Red List of Magnoliaceae: revised and extended, Botanic Gardens Conservation International; Fauna & Flora International, Richmond; Cambridge [link] (accessed 2022-04-05)
Rix, M. (2007) Pterocarya macroptera var insignis in Curtis’s Botanical Magazine 24 180–185
Rix, M. (2012) Carpinus tschonoskii in Curtis's Botanical Magazine 29:2 141-151
Rix, M. (2013) 770. Acer davidii 30:3 215-221 in Curtis's Botanical Magazine
Rix, M. (2016) 842. Acer micranthum 33:3 241-246 in Curtis's Botanical Magazine
Rix, M. & Crane, P. (2007) Tetracentron sinense in Curtis Botanical Magazine 24:3 168-173
Rix, M & Jackson, A (2004) Nothofagus moorei in Curtis's Botanical Magazine 21:1
Rix, M. & Kirkham, T. (2009) 640. QUERCUS CASTANEIFOLIA: Fagaceae in Curtis's Botanical Magazine 26:1/2 54-47, 59-63 April 2009 [link] (accessed 2020-11-03)
Rizzo, D.M. et al. (2002) Phytophthora ramorum and sudden oak death in California: I. host relationships in Standiford, R.B., McCreary, D. & Purcell, K.L. (eds) Proceedings of the fifth symposium on oak woodlands: oaks in California’s changing landscape. 2001 October 22-25; San Diego, CA. 733–740 Forest Service, U.S. Department of Agriculture (accessed 2023-05-10)
Robbins, J. (2023) Can 'Immortal' Sequoias Survive the Ravages of Climate Change?, Yale School of the Environment [link] (accessed 2024-01-16)
Robert, G-N (1838) Plantes phanérogames qui croissent naturellement aux environs de Toulon, Perreymond-Dufort, Brignoles
Robert, R. (2011) Plants of the Week – November 7 The Scott Arboretum of Swarthmore College (accessed 2023-09-23)
Robertson, C. (1892) Flowers and insects IX. in Botanical Gazette 17:9 269-276 [link] (accessed 2024-04-30)
Robertson, K.R. (1976) Cercis: the redbuds in Arnoldia 36 37–49
Robertson, K R (1977) Cladrastis: the Yellow-Woods in Arnoldia 37:3 137-150
Robertson, K.R. et al. (1991) A synopsis of genera in Maloideae (Rosaceae) in Systematic Botany 16 376–394
Robertson, K.R. et al. (1991) A Synopsis of Genera in Maloideae (Rosaceae) in Systematic Botany 16:2 376-394 [link] (accessed 2020-06-25)
Robinson, B.P. (2005) A Gardening Life: Barry Yinger in Horticulture 102:6 9 [link] (accessed 2023-12-05)
Robinson, D. (2005) Sassafras [link] (accessed 2024-06-21)
Robinson, G W (1950) Some Chilean plants cultivated in Britain 75 161-168 in Journal of the Royal Horticultural Society
Robinson Garden at Earlscliffe (2021) Plants that grow well at Earlscliffe [link] (accessed 2022-02-13)
Robinson, J.P., Harris, S.A. & Juniper, B.E. (2001) Taxonomy of the genus Malus Mill (Rosaceae) with emphasis on the cultivated apple, Malus domestica Borkh in Plant Systematics and Evolution 226 35–58
Robinson, M., Marston, J. & Foster, M. (2008) New evergreen magnolias: comments from UK growers in Rhododendrons, Camellias and Magnolias 2008 94–96
Robinson, W. (1898) The English Flower Garden (6th Edition), John Murray, London
Rocha, J. et al. (2018) Morpho-environmental strategies in the genus Ononis L.(subsections Natrix and Viscosae) in Western Mediterranean. in Plant Biosystems 152:1 14-30 [link] (accessed 2023-02-23)
Rodger, D., Stokes, J. & Ogilvie, J. (2006) Heritage Trees of Scotland, The Tree Council
Rodriguez-Coombes, M., Coombes, A. & Morales, H. (2004) Quercus insignis Martens & Galeotti: distribution and conservation in International Oaks 15 211–213
Rodriguez-Quintero, W.D. et al. (2022) From dark to darkness, negative phototropism influences the support-tree location of the massive woody climber Hydrangea serratifolia (Hydrangeaceae) in a Chilean temperate rainforest. in Plant Signaling & Behavior 17:1 2122244 [link] (accessed 2024-03-27)
Rodríguez, R & Marticorena, A (eds) (2019) Flora de Chile 3:2, Universidad de Concepción, Concepción
Rodríguez, R., Matthei, J.O. & Quezada, M. (1983) Flora Arbórea de Chile, Universidad de Concepción, Concepción
Roethling, J. (2006) Redbud resurgence in American Nurseryman 203 14–18
Rohwer, J.G. (1993a) Lauraceae in Kubitzki, K. (ed) The Families and Genera of Vascular Plants 2 366–391 (q.v.)
Rohwer, J.G. (1993b) Moraceae in Kubitzki, K. (ed) The Families and Genera of Vascular Plants 2 438–452 (q.v.)
Rojas-Sandoval, J. (2019) Buddleja madagascariensis (smokebush), Cabi, UK [link] (accessed 2020-09-07)
Roldan‐Fajardo, B.E. (1994) Effect of indigenous arbuscular mycorrhizal endophytes on the development of six wild plants colonizing a semi‐arid area in south‐east Spain. in New Phytologist 127:1 115-121 [link] (accessed 2022-12-18)
Roman, M. (2016) The Princess Tree: Stories of Paulownia Rikumo Journal (accessed 2022-08-17)
Romero, J.B. (1954) The Botanical Lore of the California Indians, Vantage Press, New York Project Gutenberg (accessed 2023-05-09)
Romero Rangel, S. (2006) Revisión taxonómica del complejo Acutifoliae de Quercus (Fagaceae) con énfasis en su representación en México in Acta Botánica Mexicana 76 1–45 SciELO (accessed 2022-12-01)
Romero Rangel, S., Rojas Zenteno, E.C. & Aguilar Enríquez, M.L. (2002) El género Quercus (Fagaceae) en el Estado de México in Annals of the Missouri Botanical Garden 89 551–593
Romero Rangel, S., Rojas Zenteno, E.C. & Rubio Licona, L.E.201 (2015) Encinos de México, Universidad Nacional Autónoma de México, México, D.F., Facultad de Estudios Superiores Iztacala
Ronse de Craene, L.P. et al. (2002) Floral anatomy and systematics of Bretschneidera (Bretschneideraceae) in Botanical Journal of the Linnean Society 139 29–45
Rosales-Castro, M. et al. (2011) Chromatographic Analysis of Bioactive Proanthocyanidins from Quercus durifolia and Quercus eduardii Barks in Acta Chromatographica 23:3 AKJournals (accessed 2024-07-03)
Rosati, C. (ed) (2000) Towards novel floral colours in Forsythia by genetic engineering in Acta Horticulturae 508 45-58
Rose, N. (2008) Silver wins Gold in Arnoldia 66:1 36-37
Rose, N. (2013) The Sweet Smell of Spring: Abelia mosanensis in Arnoldia 2013
Ross-Davis, A. et al. (2008) Morphological and molecular methods to identify butternut (Juglans cinerea) and butternut hybrids: relevance to butternut conservation in Tree Physiology 28 1127-1133 [link] (accessed 2019-10-01)
Ross, E. (1976) The great tree rip-off in Weeds, Trees & Turf October 1976 10-17 [link] (accessed 2019-09-20)
Ross, T. & Irons, J. (1997) Australian Plants: A Guide to their Cultivation in Europe, The Estate of Thomas Ross, Frankfurt-am-Main
Rosser, C. (1993) The Banksias Two volumes, Monash University, Melbourne
Roth, A,W. (1797) Catalecta Botanica (fasc. i), I.G. Müller, Leipzig [link] (accessed 2022-11-30)
Rothwell, G.W. & Holt, B. (1997) Fossils and Phenology in the Evolution of Ginkgo biloba in Ginkgo biloba - A Global Treasure
Rouse, G.D. (1989) Elms on the Royal Bath & West Showground in Quarterly Journal of Forestry 83 170–172
Rovere, A.E. & Chalcoff, V.R. (2010) Biology of Austral Species: Embothrium coccineum J.R. Forst. et G. Forst. [in Spanish] in Kurtziana 35:2 23-33 [link] (accessed 2023-05-09)
Rovere, A et al. (2006) Breeding system of Embothrium coccineum (Proteaceae) in two populations on different slopes of the Andes in Revista Chilena de Historia Natural 79:2 225-232
Rovira, M. (2021) Advances in Hazelnut (Corylus avellana L.) Rootstocks Worldwide in Horticulturae 7 267
Rowden, A. et al. (2004) Conservation genetics of Mexican beech, Fagus grandifolia var mexicana in Conservation Genetics 5 475–484
Roxburgh, W. (1832) Flora Indica; or, Descriptions of Indian Plants 3, Serampore
Royal Botanic Garden Edinburgh (2007–2008) Catalogue of the living collections (search for individual taxa) [link] (accessed 2008-07-25)
Royal Botanic Garden Edinburgh (2014) Botanics Stories: Not for Shelling [link] (accessed 2023-02-10)
Royal Botanic Garden Edinburgh (2018) Catalogue of the Living Collections [link] (accessed 2019-04-19)
Royal Botanic Garden Edinburgh (2020) The Endemic Plants of Chile [link] (accessed 2020-10-04)
Royal Botanic Garden Edinburgh (2022) The Catalogue of Plants 2021, Royal Botanic Garden Edinburgh [link] (accessed 2022-01-19)
Royal Botanic Garden Edinburgh (2023 onwards) Multisite search [link] (accessed 2020-05-08)
Royal Botanic Garden Edinburgh (ed) (2021) Forsythia [link] (accessed 2021-12-28)
Royal Botanic Gardens, Kew (1894) Hand-list of trees and shrubs grown in arboretum Part 1, Her Majesties Stationary Office, Eyre and Spottiswoode, London
Royal Botanic Gardens, Kew (1895) Handlist of Trees and Shrubs 19
Royal Botanic Gardens, Kew (1920) Miscellaneous Notes. The Fruiting of the Ginkgo at Kew. 1 31-48 in Bulletin of Miscellaneous Information
Royal Botanic Gardens, Kew (1928) Popular Official Guide to the Royal Botanic Gardens Second edition, HMSO, London
Royal Botanic Gardens, Kew (2008) Phenology at Kew Information sheet K36 [link] (accessed 2008-12-05)
Royal Botanic Gardens, Kew (2019 onwards) Plants of the World Online [link] (accessed 2019-07-19)
Royal Botanic Gardens, Kew (2020) Electronic Plant Information Centre (ePIC) Royal Botanic Gardens, Kew
Royal Botanic Gardens Kew (2022) Plants of the World Online [link]
Royal Botanic Gardens Kew (2023) Plants of the World Online: Embothrium coccineum J.R.Forst. & G.Forst. [link] (accessed 2023-09-27)
Royal Botanic Gardens Victoria (2020) HORTFLORA: Horticultural Flora of South-eastern Australia [link]
Royal Botanic Gardens Victoria (2022) Living Collection Census, Royal Botanic Gardens Victoria [link]
Royal Horticultural Society (1932) Proceedings of the Royal Horticultural Society 57 XXIV
Royal Horticultural Society (1997) The Rhododendron Handbook 1998, The Royal Horticultural Society, London [link]
Royal Horticultural Society (2009) The International Clematis Register and Checklist 2002: Third Supplement, Royal Horticultural Society, London [link] (accessed 2024-04-04)
Royal Horticultural Society (2016 onwards) Horticultural Database search [link] (accessed 2020-02-21)
Royal Horticultural Society (2018) The Plant Finder
Royal Horticultural Society (2019) RHS Plants for Pollinators [link] (accessed 2024-01-02)
Royal Horticultural Society (2020) Ornamentals – AGM plants, Royal Horticultural Society, London, UK [link] (accessed 2020-09-14)
Royal Horticultural Society (2021) Apples [link] (accessed 2021-04-12)
Royal Horticultural Society (2022) Air layering of plants [link] (accessed 2022-04-29)
Royal Horticultural Society (2022) Crinodendron hookerianum | Chile lantern tree [link]
Royal Horticultural Society (2022) How to Grow Magnolias [link] (accessed 2022-04-29)
Royal Horticultural Society (2023 onwards) Find a plant [link] (accessed 2023-03-16)
Royal Horticultural Society (2023) Medlars [link] (accessed 2023-01-13)
Royal Horticultural Society Advice (2021) Holm oak leaf-mining moths. [link] (accessed 2021-01-22)
Royal Horticultural Society Learning (2008) Gardening in the global greenhouse: planting opportunities and challenges [link] (accessed 2008-05-26)
Royal New Zealand Institute of Horticulture (2020 onwards) Duncan and Davies Nursery Catalogues [link] (accessed 2021-09-02)
Royer, D.L., Hickey, L.J. & Wing, S.L. (2003) Ecological conservatism in the “living fossil” Ginkgo 29:1 84 - 104 in Paleobiology
Rozefelds, A.C. (2008) Uniquely Tasmanian – a review of the phylogenetic and biogeographical relationships of Tasmania’s endemic vascular plant genera. in Kanunnah 2 35–86 [link] (accessed 2022-12-19)
Rozefelds, A.C. & Barnes, R.W. (2002) The systematic and biogeographical relationships of Ceratopetalum (Cunoniaceae) in Australia and New Guinea in International Journal of Plant Sciences 163 651–673
Rubin, K. (2016) The Metasequoia Mystery in Landscape Architecture Magazine [link] (accessed 2021-06-08)
Rudawska, M. et al. (2018) Mycorrhizal associations of the exotic hickory trees, Carya laciniosa and Carya cordiformis, grown in Kórnik Arboretum in Poland. in Mycorrhiza 28 549-560 [link] (accessed 2019-11-13)
Ruiz, H & Pavón, J (1798) Systema vegetabilium Florae Peruvianae et Chilensis, characteres prodromi genericos differentiales, specierum omnium differentias, durationem, loca natalia, tempus florendi, nomina vernacula, vires et usus nonnullis illustrationibus interspersis complectens, Typis Gabrielis de Sancha, Madrid.
Ruiz-JIménez, C.A., Meave, J. & Contreras-Jiménez, J.L. (1999) El bosque mesófilo de la región de Puerto Soledad (Oaxaca), México: análisis estructural in Boletín de la Sociedad Botánica de México 65 23–37 [link] (accessed 2023-01-13)
Ruiz, R L & Pavón, J (1798-1802) Flora Peruviana, et Chilensis, sive descriptiones, et icones plantarum Peruvianarum, et Chilensium, secundum systema Linnaeanum digestae, cum characteribus plurium generum evulgatorum reformatis. 1-3 vols. Madrid.
Ruizheng, F. & Stevens, P.F. (2005) Enkianthus 243-245 in Wu, Z.Y., Raven, P.H. & Hong, D.Y. (eds) Flora of China 14 Apiaceae through Ericaceae, Science Press & Missouri Botanical Garden Press, Beijing & St. Louis [link] (accessed 2022-08-25)
Rule, K. (1991) Two new subspecies within Eucalyptus leucoxylon F Muell. and notes on that species in Muelleria 7 389–403
Rule, K. (1992) Two new species of Eucalyptus (Myrtaceae) in south-eastern Australia in Muelleria 7 497–505
Rule, K. (1994) Three new endemic subspecies of snow gum for Victoria and notes on the taxonomy of the informal superspecies Pauciflora in Pryor, L.D. & Johnson, L.A.S. Muelleria 8 223–233
Rule, K. (1998) A new, rare Victorian subspecies of Eucalyptus leucoxylon F Muell in Muelleria 11 133–136
Rumsey, F., Russell, S. & Wiltshire, E. (2006) A preliminary molecular investigation to characterize and identify Fulham Oaks, their progeny and related cultivars in London in The London Naturalist 85 39-49
Rusanen, M. & Myking, T. (2003) EUFORGEN Technical Guidelines for genetic conservation and use for sycamore (Acer pseudoplatanus)., International Plant Genetic Resources Institute, Rome
Rushforth, H.M. (1975) Tree genera: 2 Betula in Arboricultural Journal 2 307–314
Rushforth, K. (1995) Acer chapaense and its systematic position in International Dendrology Society Yearbook 1994 69–71
Rushforth, K. (1999) Acer bodinieri Hector Léveillé in International Dendrology Society Yearbook 1998 71-72
Rushforth, K. (1999) Trees of Britain and Europe, HarperCollins, London
Rushforth, K. (2018) The whitebeam problem, and a solution in Phytologia 100:4 222-247 [link] (accessed 2020-04-21)
Rushforth, K.D. (1977) Tree genera: 7 The spruces: Picea in Arboricultural Journal 3: 246–255. 246–255
Rushforth, K.D. (1983) Abies chengii – A previously overlooked Chinese Silver Fir in Notes from the Royal Botanic Garden Edinburgh 41:2 333-338
Rushforth, K.D. (1984b) Abies delavayi and A. fabri in International Dendrology Society Yearbook 1983 118–120
Rushforth, K.D. (1984a) Notes on Chinese silver firs: 2 in Notes from the Royal Botanic Garden Edinburgh 41 535–540
Rushforth, K.D. (1985) Hornbeams and hop hornbeams: Part 1 in The Plantsman 7 173–191
Rushforth, K.D. (1986b) Hornbeams and hop hornbeams: Part 2 in The Plantsman 7 205–211
Rushforth, K.D. (1986a) Mexico’s spruces: rare members of an important genus in The Kew Magazine 3 119–124
Rushforth, K.D. (1986) Notes of Chinese Silver Firs 3 in Notes from the Royal Botanic Garden Edinburgh 43:2 269-275
Rushforth, K.D. (1987a) Conifers, Christopher Helm, Bromley
Rushforth, K.D. (1987b) Key to Carpinus and Ostrya in The Plantsman 8 249–256
Rushforth, K.D. (1989) Two new species of Abies from western Mexico in Notes from the Royal Botanic Garden Edinburgh 46:1 101-110
Rushforth, K.D. (1991) Bhutanese Sorbi: Part 1 in The Plantsman 13 111–124
Rushforth, K.D. (1993) Lectotypes for Himalayan Sorbus taxa in Edinburgh Journal of Botany 49 299–310
Rushforth, K.D. (1999) Abies recurvata in Curtis's Botanical Magazine 16:3 193-198
Rushforth, K.D. (1999) Taxonomic notes on some Sino-Himalayan conifers in International Dendrology Society Yearbook 1998 60–63
Rushforth, K.D. (2007) Notes on Cupressaceae in Vietnam in Journal of Ecology Vietnam 29 32–39
Rushforth, K.D. (2008) Spruces (Picea: Pinaceae) in the Yarlung Tsangpo drainage of southeast Tibet (Xizang, China) in International Dendrology Society Yearbook 2007 42–53
Rushforth, K.D. (2009) The Tibetan Silver Fir in International Dendrology Society Yearbook 2008 39-46
Rushforth, K. et al. (2003) Variation among Cupressus species from the eastern hemisphere based on Random Amplified Polymorphic DNAs (RAPDs) in Biochemical Systematics and Ecology 31 17–24
Russell, J. (1986) Review: Manual of Cultivated Broad-leaved Trees and Shrubs, Gerd Krüssmann in International Dendrology Society Yearbook 1986 130–134
Russell, P.G. & Leese, B.M. (1960) Plant Inventory No. 162 291, United States Department of Agriculture, Washington, D.C. [link] (accessed 2020-07-13)
Russell, R. (2017) Frost Damage in Aiken, South Carolina on March 15, 2017 International Oak Society (accessed 2023-01-14)
Russell, R. (2018) New Champions in New Mexico International Oak Society (accessed 2024-07-13)
Russell, R. (2019) Cultivar Close-Up: Mighty Miniatures, International Oak Society International Oak Society (accessed 2020-07-17)
Russell, R. (2019) Hybrid Highlight: Quercus ×morehus Kellogg International Oak Society (accessed 2022-12-22)
Russell, R. (2020) In Search of an Endangered Species: Quercus acerifolia International Oak Society (accessed 2023-01-11)
Russell, R. & Jablonski, E.J. (2016) New and Lesser-Known Oak Cultivars 2013-2015 in International Oaks 27 137–148 International Oak Society (accessed 2023-05-24)
Russell, R., Jablonski, E.J. & Coombes, R.A. (2021) New and Lesser-Known Oak Cultivars 2020 in International Oaks 32 113–124 [link] (accessed 2023-01-03)
Rust, S. & Savill, P.S. (2000) The root systems of Fraxinus excelsior and Fagus sylvatica and their competitive relationships. in Forestry 73 501-510
Rutgers, The State University of New Jersey (2020) Rosy Teacups® [link] (accessed 2020-11-20)
Rutgers, The State University of New Jersey (2020) Starlight® [link] (accessed 2020-11-20)
Rutgers, The State University of New Jersey (2020) Venus® [link] (accessed 2020-11-20)
Rutgers, The State University of New Jersey (2021) Scarlet Fire® [link] (accessed 2021-02-03)
RV Roger (2023 onwards) [nursery website] [link] (accessed 2023-01-13)
Ryan, M. (1999) Tour Report: North India and Nepal in International Dendrology Society Yearbook 1998 139-150
Ryan, S. (2008) Dicksonia Rare Plants Manual., Hyland House Publishing Pty Ltd., Flemington, Victoria