l~i\] Aceraceae. 409 



Wings of the fruit with the nutlets 1 — 2 cm long, spreading 



at an obtuse angle. 7. Acer pabnatum- 



Wings of the fruit with the nutlets 3,6—4 cm long, horizon- 



tally spreading. 8. Acer robustuiti. 



Inflorescence paniculate. III. Spicata- 



a) Leaves 5 — 7-lobed (3-lobed in No. 13), the lobes acumiuate; wings 



of the fruit usually horizontallj spreading. 



b) Petals oval to elliptic, scarcely longer than the sepals. 



c) Leaves usually 5-lobed, truncate or with an open cor- 

 date base. 

 Panicle corj^mbiform, many-flowered. 



Leaves sharply serrulate, glabrous beneath; wings of the 

 fruit spreading nearly horizontally. 



9. Acer Oliverianum. 



Leaves crenulate-dentate, pubescent on the veins beneath 



the basal lobes xery small; wings of the fruibs 



erect. 10. Acer Giraldii. 



Panicle elongated. 



d) Sepals glabrous or but slightl}^ villous on the inner 

 surface. 

 e) Leaves 6^7-lobed. 



Leaves greeu beneath, often 7-lobed, the lobes 



entire or serrulate; style about as long as 



the Stigmas. 11. Acer CampbelU. 



Leaves glancous or glaucescent beneath, 5-lobed. 



liobes of the leaves obtuselj- crenulate-serrate. 



sepals obovate; style divided to the base; 



wings of the fruit with the nutlets 



4 — 6 cm long. 12. Acer caesium. 



Lobes of the leaves sparingiy serrulate towards 



the apex; sepals triangular-oblong; style 



divided only at the apex; wings with 



the nutlets about 8 cm long. 



13. Acer sinense- 

 ee) Leaves 3-lobed, with sparingiy serrate or nearly 

 entire lobes. 14. Acer Wilsoni; 



dd) Inner surface of the sepals and the ovary densely 

 villous; panicle cylindric, rather compact; leaves 

 sharply serrate. 16. Acer erianthum. 



cc) Leaves 7 or rarely 6-lobed, deeply cordate at the 

 base; sharply serrate; panicles glabrous, nodding. 

 wings of the fruit 2,6 cm long, spreading horizon- 

 tally. 16. Acer fiabellatum- 

 bb) Petals linear-oblong, much longer than the sepals; in- 

 florescence cylindric, upright. 17. Acer caudafum- 

 aa) Leaves 3-lobed or sometimes undivided; wings of the fruit upright 

 or spreading at a right angle. 



Leaves always 3-lobed, with an elongated middle lobe 

 incisely serrate and membranaceous. 



18. Acer Ginnala. 



