ORDER 40. THE MAPLES. 187 



b Common petiole winged between the leaflets No. 7. 



b Common petiole not winged. . . .Nos. 8-10. 

 : R Cot'inns. Venetian Sumac. Smoke Tree. Leaves obovate, entire, thick. Floweri 



mostly abortive, pedicels diffusely branched, hairy. Italy. 

 > R. cotinoi'des. Leaves oval, obtuse, acute at base. Flowers minute. Mts. S. 

 8 R aiomafica. Siceet S. A small aromatic shrub, 2-6f. Leaflets sessile, ovate 

 Flowers yellowish. Drupes globular, woolly, red, sour. May. Not poison. 



4 R. vcnena'ta. Ptisan S. Dog-wood. Very smooth; leaflets 7-13, oval, pointed, verj 



entire. Drupes greenish yellow, smooth. A small tree, 10-15f. high, in swamps. 

 Junf. The meet venomous of the species. (Fig. 429'.) 



5 R. toxicoden'dron. Poison Oak. Poison Ivy. Erect or declining, 2-3f. Leaflets 3, 



variously toothed or cut-lobed, downy. Drupes smooth. June. 



6 R. radi'cans. Climbing Jcy. Stems climbing trees, etc., by innumerable radiating 



tendrils. Leaflets ovate, smooth, entire. Reputed poisonous. June. 



7 R. copalli'na. Mountain Sumac. Shrub, l-6f. Leaflets 9-21. July. 



8 R. pu'mila. Creeping S. Leaflets 9-17, coarsely toothed. Poisonous. Carolina. 



9 R. typh'ina. Stag-horn S. Branches and petioles woolly. Leaflets 11-31, lance-ob. 



long, downy beneath. Drupes red, acid ; wood yellow. June. Shrub 10-20f. 



10 R. glabra. Smooth S. Smootli ; leaflets lanceolate, whitened beneath. Shrub 6-15f. 



high. Flowers in terminal, dense panicles, greenish red. Fruit clothed with crim- 

 son fur which is excessively sour to the taste. Bark used in tanning. 



ORDER XL. ACERACE.E. The Maples. 



Trees or shrubs with opposite, usually simple palmate-veined leaves; the 

 flowers often imperfect, with the 5 sepals imbricated in the bud, and the 

 petals 5, hypogynous, sometimes ; the stamens mostly 8, and the 

 fruit a double samara, with two opposite wings, 2-seedcd. 



Analysis of the Gencru., 



Leaves simple, palmate-veined. Very common. Maple. ACER. 1 



Leaves compound, odd-pinnate. Leaflets 3-5, toothed. Box-Elder. NEGUNDO. 



1. ACER. Maple. 



Calyx of 5 united sepals, 5-lobed. Petals 5 or 0. Styles 2. Stamens 

 6-8. Leaves simple, palmate-lobed. Flowers mostly polygamous. 



Pedicels short, in side clusters, flowering before the leaves. Trees. . . .1, 2 

 1'edicels long, slender, drooping, flowering ivitlt the Ivs. Large trees. . . .3, t 



Pedicels in racemes, flowering after the leaves 5-7 



1 A dasycar'pum. White M. Leaves deeply lobed, square at base, silver- whit* 

 beneath. Ovaries downy. Fruit very large, Petals 0. Tree 50f. 



