Tilia paucicostata Maxim.

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Credits

Owen Johnson & Julian Sutton (2020)

Recommended citation
Johnson, O. & Sutton, J. (2020), 'Tilia paucicostata' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/tilia/tilia-paucicostata/). Accessed 2020-07-05.

Genus

Glossary

section
(sect.) Subdivision of a genus.
corolla
The inner whorl of the perianth. Composed of free or united petals often showy.
cyme
Branched determinate inflorescence with a flower at the end of each branch. cymose In the form of a cyme.
dbh
Diameter (of trunk) at breast height. Breast height is defined as 4.5 feet (1.37 m) above the ground.
stellate
Star-shaped.
subspecies
(subsp.) Taxonomic rank for a group of organisms showing the principal characters of a species but with significant definable morphological differentiation. A subspecies occurs in populations that can occupy a distinct geographical range or habitat.

References

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Credits

Owen Johnson & Julian Sutton (2020)

Recommended citation
Johnson, O. & Sutton, J. (2020), 'Tilia paucicostata' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/tilia/tilia-paucicostata/). Accessed 2020-07-05.

A small tree, to about 10 m tall. Bark brownish-grey, developing narrow vertical ridges in maturity. Twigs slender (1–2 mm thick), green or red, shining and glabrous, or with sparse white stellate hairs on weaker shoots. Buds 5–7 mm long, usually with two scales visible, red and shining. Leaves 4-9 × 3-7 cm, triangular ovate and widest around the base which is obliquely truncate or even slightly cuneate rather than cordate; marginal teeth small and regular with apiculate tips 0.3–1 mm long; upper surface green and smooth, lower surface pale green, not glaucous, with tufts of brown hair under the vein axils. Floral bracts 5-11 × 1-2 cm, usually elliptical, with a slender stalk 0.5–2 cm long; both surfaces glabrous, pale green. Inflorescence drooping, with slender stalks branching 3 times at wide angles so that the small flowers (about 15 in number, 10–13 mm wide) are well-spaced. Staminodes present. Fruits small (6–8 × 4–6 mm), ellipsoidal, unribbed, covered in short dense hairs; wall fragile, 0.2–0.3 mm thick (Pigott 2012, Tang et al. 2007).

Distribution  China Gansu, Hebei, Henan, Hubei, Hunan, Shaanxi, Sichuan, Yunnan

Habitat Mountain forests.

USDA Hardiness Zone 7

RHS Hardiness Rating H5

Conservation status Least concern (LC)

Taxonomic note Pigott (2012) distinguishes ssp. dictyoneura (V. Engler) Pigott with remarkably small leaves, only about 30 mm wide, and fewer flowers per cyme, a shrub or small tree in the wild (mostly at high altitude in Shaanxi); and ssp. yunnanensis (Diels) Pigott with a tomentose underside to the leaf, from Yunnan. Neither subspecies is known to be in cultivation in the west.

Tilia paucicostata, usually a small tree in the wild, has rather small leaves, green beneath, which are perhaps less showy than those of many other Chinese limes. Described by Maximovicz in 1892 from a specimen collected in Gansu by the Russian explorer and Siberian separatist Grigory Potanin, the specific epithet implies ‘few veins’, although 5–6 major leaf veins is not notably few for the smaller-leaved species (Pigott 2012).

This is in several ways a peripheral species. While conventionally placed in Section Anastraea, characterized by a lack of stellate hairs beneath the leaves, its position is uncertain (Pigott 2012). While the widespread ssp. paucicostata lacks these hairs, they are present in ssp. yunnanensis (see taxonomic note above). Furthermore, all subspecies have short filaments (under 3 mm) so the stamens are retained within the corolla. This is useful in identification, clearly distinguishing this species from T. amurensis and T. cordata. Its wild distribution lies at the north western fringe of the genus’ distribution in central China, an area with a continental climate and predominantly summer rainfall.

Despite being in cultivation for more than a century, it remains very uncommon, and rarely mentioned in the literature. The example in the lime collection at Dibbins Wood, Deene Park, Northamptonshire, has grown into a notably graceful tree, 14 m × 31 cm dbh by 2009 (Tree Register 2018). Larger examples grow in the lime avenue at Thorp Perrow in North Yorkshire (22 m × 47 cm dbh in 2014) and at the Glasnevin National Botanic Garden in Dublin (16 m × 51 cm dbh in 2012). These trees were planted in 1936 and 1914 respectively and are probably grafts from the tree grown at Veitch’s Coombe Wood Nursery from the original seed introduction, made by Ernest Wilson in north west Hubei in 1901, under W 2422 (Bean 1981, Sargent 1916). Specimens in western England may come into growth early, suffering damage from late frosts (Pigott 2012).

In continental Europe, there are young trees at Gothenburg Botanical Garden (2008 accession, wild origin – Gothenburg Botanical Garden 2020) and the Arboretum Wespelaar (1991 accession – Arboretum Wespelaar 2020). Despite a long history of cultivation, it is a rare species in North American collections. A tree planted in 1920 at the Arnold Arboretum was measured at 56 cm dbh in 2019 (Arnold Arboretum 2020). Despite a less than encouraging provenance for such an obscure tree – the Parks Department of Rochester, NY – Pigott (2012) is confident of its identification. There are several young examples from NACPEC collections made in Gansu and Shaanxi at the Morton Arboretum, IL (Morton Arboretum 2020).


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