Acer forrestii Diels

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Article from Bean's Trees and Shrubs Hardy in the British Isles

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'Acer forrestii' from the website Trees and Shrubs Online ( Accessed 2019-12-16.



  • A. pectinatum subsp. forrestii (Diels) E. Murray


Other species in genus


A collection of preserved plant specimens; also the building in which such specimens are housed.
Angle between the upper side of a leaf and the stem.
Situated in an axil.
Spreading from the centre.
Lacking hairs smooth. glabrescent Becoming hairless.
Becoming glaucous; (incorrectly) slightly glaucous.
(of fruit) Vernacular English term for winged samaras (as in e.g. Acer Fraxinus Ulmus)
Taxonomic account of a single genus or family.
(sect.) Subdivision of a genus.
(syn.) (botanical) An alternative or former name for a taxon usually considered to be invalid (often given in brackets). Synonyms arise when a taxon has been described more than once (the prior name usually being the one accepted as correct) or if an article of the International Code of Botanical Nomenclature has been contravened requiring the publishing of a new name. Developments in taxonomic thought may be reflected in an increasing list of synonyms as generic or specific concepts change over time.


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Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Acer forrestii' from the website Trees and Shrubs Online ( Accessed 2019-12-16.

A deciduous tree up to 40 ft or more high in a wild state; young shoots purplish or red, glabrous. Leaves mostly three- (sometimes five-) lobed, slender-pointed, more or less heart-shaped at the base, finely toothed; side lobes triangular, divergent, sometimes much reduced on flowering shoots; 2 to 412 in. long, 1 to 3 in. wide; smooth on both surfaces except for axil-tufts of down beneath; stalk 1 to 212 in. long; chief veins webbed at the base. Flowers brownish green, produced with the leaves in May on slender racemes up to 4 in. long. Fruits glabrous, the wings 14 in. wide, spreading almost horizontally and giving the whole fruit (with the nutlets) a spread of 112 to 2 in.

Native of China; discovered by Forrest on the eastern flank of the Lichiang range in 1906 and introduced by him in the same year. Rehder and Wilson, in Plantae Wilsonianae, Vol. 3, p. 426, made A. forrestii a synonym of A. laxiflorum, but later Rehder withdrew this judgement and treated the two species as distinct in Journ. Arn. Arb., Vol. 14, pp. 211-22, as does Fang in his monograph on the Chinese maples. The key character by which A. forrestii may be distinguished from laxiflorum is that the leaves are glaucescent beneath and, except for tufts of down in the axillary pockets, glabrous; in the latter they are green beneath and downy on the veins, at least when young. There seems to be no other reliable character by which they may be distinguished and indeed the material in the Kew Herbarium suggests that the difference between them is slight.

A. forrestii is uncommon in cultivation. The largest specimens recorded are at Caerhays Castle, Cornwall, where there is one of 38 × 214 ft, dividing at 312 ft, raised from Forrest 30631, and another 36 × 314 ft at 2 ft, from Forrest 28395 (both measured 1966). There is a smaller plant at Westonbirt in Mitchell Drive and others in Silkwood. A. forrestii is a handsome species with the characteristic snake-bark of its group; the branching is sparse but very graceful and the beautifully formed leaves, borne on red petioles, are of a rich green and held long into the autumn. It is rather tender when young.

From the Supplement (Vol. V)

specimens: Westonbirt, Glos., pl. 1946, 44 × 212 ft (1982) and, pl. 1948, 36 × 212 ft (1978); Caerhays, Cornwall, from Forrest 28395, 50 × 6 ft at 3 ft and 46 × 634 ft (1984).

A. wardii – In his classification of the genus, de Jong places this species in a monotypic series of the section Macrantha.

A wardii W. W. Sm

A native of Upper Burma and neighbouring parts of Yunnan and Tibet; discovered by Kingdon Ward in 1914; introduced by Forrest. It is a tender and little-known maple, more at home in section Macrantha with the snake-bark maples than near A. sinense, which Sir William Wright-Smith suggested as its nearest ally. The fine specimen at Trewithen, Cornwall, died recently from the effects of the 1962-3 winter but we are told by Mrs Johnstone that one cutting from it was struck.


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