TREES AND SHRUBS, 



ACER SUTCHUENSE, Fea^ch. 



Acer Sutchuense, Franchet, Jour, de Bot. viii. 294 (1894). — Bois, Jour. Soc. Nat. Hort. 



France, ser. 4, i. 199. — Pax, Engler Pfianzenreich, Heft 8 (iv. 163), 29.— J. H. Veitch, 



Jour. Hoy. Hort. Soc. xxix. 353, f . 96. — Render, Sargent Trees and Shrubs, i. 181. — 



Schneider, III Handb. Laubholz. ii. 212, fig. 140 p-q. 



Leaves deciduous, trifoliate, their petioles slender, from 3 to 7 centimetres long, grooved, 

 glabrous with the exception of a tuft of yellowish hairs at the articulation of the petiolules; 

 leaflets elliptic-oblong to oblong-lanceolate, acuminate, from 5 to 8 centimetres long and from 1.8 

 to 3.2 centimetres wide, unequally and obtusely dentate, glabrous and dull green above, glaucescent 

 and sparingly villous beneath, reticulate at maturity, with eight to ten veins, the terminal leaflet 

 broadly cuneate at the base, with a petiolule from 5 to 8 millimetres in length, the lateral leaflets 

 obliquely rounded at the base, with much shorter petiolules. Inflorescence a dense many-flowered 

 corymbiform raceme on a leafy or rarely leafless branch, usually simple but occasionally with 

 three-flowered ramifications at the base, glabrous, 3.5 centimetres broad and about 2 centimetres 

 high, on a peduncle from 8 to 16 millimetres long ; pedicels from 8 to 12 millimetres in length, 

 with a short ovate bract at the base ; flowers andro-dicecious, 5-merous, yellowish ; t 

 with oval sepals 6 millimetres long and oblong petals of about the same length ; 

 nearly twice as long as the petals, inserted on the disk ; rudimentary ovary small, pilose ; her- 

 maphrodite flowers not yet known. Fruits apparently upright, in short glabrous racemes ; wings 

 curved upwards and parallel, light purplish or brownish, with the nutlet from 1.8 to 2 centimetres 

 in length ; nutlets from 7 to 8 millimetres long and 6 millimetres broad, strongly convex and 

 inconspicuously veined, light brown, with thick woody walls. 



A tree, sometimes 6 metres high, with glabrous branchlets marked by numerous lenticels, 

 purplish brown at the end of their first year, later becoming light grayish brown. Winter-buds 

 ovate, obtusish, from 4 to 6 millimetres long, with four or six pairs of outer ovate acute scales, 

 lustrous brown, and glabrous with the exception of the yellowish hairs on the margins. 



China : East Szech'uan, R. P. Farges (No. 955 ex Franchet) ; Western Hupeh, E. H. Wilson 

 (No. 639), S. Wushan, E. H. Wilson (No. 1931). 



Acer Sutchuense is most nearly related to Acer Mandshuricum, Maximowicz, but differs from that species chiefly in 

 its many-flowered inflorescence, in the shorter pedicels, and in the exserted stamens ; in winter it may be easily distin- 

 guished by its shorter ovate and obtusish winter-buds, which in Acer Mandshuricum are ovate-lanceolate and sharply 

 pointed. A peculiarity of Acer Sutchuense rarely seen in other species is the occasional suppression of one of the 

 leaves of the pair below the inflorescence, which is borne on branchlets furnished with two or with one pair of leaves, 

 but sometimes on leafless branchlets. The description of the previously unknown fruits has been drawn from Wilson's 

 No. 1931. 1 



Alfred Rehder. 



Arnold Arboretum. 



1 As the recent collections of Wilson and others have added to the knowledge of Asiatic Maples and their distribution, some 

 supplementary notes to species previously treated in this work (see i. 151-182) are added here. 



Acer ljstum, C. A. Meyer, see p. 177. Western China: E. H. Wilson (No. 3357). 



Acer l^tum, var. tomentosulum, Rehder, see p. 178. Western China : E. H. Wilson (No. 3353). 



Acer longpipes, Rehder, see p. 178. 



Leaves at maturity velvety pubescent beneath, their petioles much enlarged at the base, embracing the lower part of the 

 winter-buds and furnished with a ligula-like protraction. Fruits in a loose and large corymb; wings with the nutlets from 3 to 



