82 SILVA OF NORTH AMERICA. SAPINDACEZ. 
CONSPECTUS OF THE NORTH AMERICAN SPECIES. 
Acer. Flowers polygamo-monecious or polygamo-diecious ; leaves simple. 
Flowers usually polygamo-monecious in terminal racemes on leafy branches, appearing later than the leaves. 
Flowers in dense upright racemes. 
Petals linear-spatulate, much longer than the sepals; leaves three or slightly five-lobed . 1. A. sPICATUM. 
Flowers in drooping racemes. 
Sd 
Petals obovate ; ovary and young fruit glabrous; leaves three-lobed at the apex . A. PENNSYLVANICUM. 
Petals obovate; ovary and young fruit hairy; leaves deeply five-lobed . . . . . . 3. A. MACROPHYLLUM. 
Flowers in terminal pedunculate corymbs, appearing with the leaves. 
Flowers usually polygamo-monecious; petals involute, much shorter than the sepals; 
leaves palmately seven to eight-lobed . . . - - . « «© e+ ee + + . 4 A. CIRCINATUM. 
Flowers usually polygamo-diecious; petals linear, as long as the sepals; leaves three- 
lobed or three-parted . . 2 1. ee ee ee ee eee ee ee. 6 AL GLABRUM. 
Flowers usually polygamo-monecious, in nearly sessile umbel-like terminal and lateral cor- 
ymbs, appearing with the leaves. 
Flowers apetalous; leaves three to fivelobed . . - - + + + + + + + « + + 6, A. BARBATUM. 
Flowers precocious, usually polygamo-diecious, in umbel-like fascicles from separate lateral 
buds. 
Flowers sessile or short-pedunculate; ovary and young fruit tomentose ; leaves deeply 
five-llobed . . 2. 2. 1 ew we ee ee et . e ew whl elle) CU AL SACCHARINUM. 
Flowers long-pedunculate ; ovary glabrous; leaves three to five-lobed . . . . . . 8. A. RUBRUM. 
Necunpo. Flowers diecious; leaves pinnately or ternately divided. 
Flowers apetalous . . 2. 1. 1 1 ee ee et ee ww we we ww we wl he 6D A. NEGUNDO. 
