1731 Aceraceae. 41t 



Leaves cordate at the base, 6 — 6 cm long. 31. Acer Grosseri^ 



Leaves elongated, with caudate incisely seirate lobes and acute 



deep sinuses. 32. Acer urophyllum. 



Stamiuate inflorescence froin lateral leafless buds; nutlets convex, reti- 



ciilate, with firm woody walls; flowers dioecious (always?). 



Flowers 4-merous; stamens 4 — 6; pistillate inflorescence from terminal 



leafy branches, winter-buds with one pair of valvate outer 



scales. VII. Arguta. 



Leaves undivided or slightly lobed; petals elliptic-oblong. 



Leaves 5-nerved and usually rounded at the base; pubescent 

 or glabrescent beneath ; fruits spreading at a right angle. 



33. Acer tetramernm- 

 Leaves 3-nerved and often truncate at the base, with scattered 



appressed hairs beneath, or glabrescent; wings of the 

 fruit spreading at an obtuse angle. 



34. Acer betulifolium. 

 Leaves palmately 5-lobed; petals elliptic, obovate, clawed. 



35. Acer barbinerve. 

 Flowers 6-merous, stamens 8 — 10: pistillate inflorescence like the 



staminate from lateral leafless branchlets; leaves 8 — 5 lobed; 

 winter-buds with numerous decussate outer scales. 



VIII. Lithocarpa^ 

 Leaves 3 — 5 lobed, with broad and very short lobes. 

 Inflorescence racemose. .short-peduncled ; sepals ciliate. 



36. Acer Franvheti^ 

 Inflorescence capitate-racemose, long-peduncled; sepals and 



petals ciliate. 37. Acer Schoenermarkiae^ 



Leaves deeply 3-lobed, with coarseh' toothed or nearly entire 

 lobes; inflorescence few-flowered fascicle-like. 



38. Acer pilosuni- 



Leaves 3-foliolate; inflorescence terminal; disk extrastaminal; winter-buds- 



with several pairs of outer decussate scales. IX. TrifoHata. 



Inflorescence and leaves glabrous or neai'ly so; leaves oblong-lanceolate. 



Inflorescence Compound, many-flowered; stamens exserted. 



39. Acer sutclmense^ 

 Inflorescence simple, few-flowered; stamens not exserted. 



40. Acer mandschuricuni^ 

 Inflorescence and leaves pilose; inflorescence few-flowered; fruits densely 

 pubescent. 

 Leaflets serrate or dentate, flowers on slender pedicels. 



Leaflets elliptic-oblong to oblong-lanceolate, 7 — 13 cm long,, 

 sparingly and obscurely serrate. 

 Petioles reaching 6 cm in length, slightly ]>ilose. 



41. Acer trifiorum- 

 Petioles short, 2 — 3,5 cm long, densely pilose. 



42. Acer nikoense. 



Leaflets elliptic to elliptic-lanceolate 4—6 cm long, coarsly 



dentate. 43. Acer grif^eum^ 



Leaflets mostly entire; flowers sessile. 44. Acer Henry i. 



Es folgt dann eine Aufzählung der Species mit Synonymen und Ver- 



