Nineteenth annual Meeting. 103 



( Order Anacardiacese.) 

 12. Rhus. Sumach. 



15. B. copallina, L.; Dwarf Sumac. A small tree or only a shrub. Lfts. 9-21, ovate- 



lauceolate, petioles winged between the lfts.; branches and petioles pubescent; 

 fruit hairy. 



16. R. venenata, L.; Poison Sumac, Poison Elder. A small tree, If ts. 7-13, ovate-ob- 



long, petioles wingless; fr. glabrous, whitish, smooth. Whole plant poison- 

 ous to taste or touch. 



(Order Leguminosse.) 



13. RoBiNiA. Locust. 



17. R. Pseudacacia, L.; Black Locust, Yellow Locust. Small or medium-sized tree; 



prickly or spiny; wood heavy, hard; lfts. 6-12 pairs; fls. fragrant, showy, in 

 numerous pendulous clusters; pod i'-B^ long. 



14. Gymocladus. Coffee-teee. 



18. G. Canadensis, Lam.; Kentucky Coffee-Tree. A large tree; wood strong and 



heavy, but not hard; branches naked; Ivs. very large, bi-pinnate; pods contain- 

 ing several brown, hard, polished seeds. 



15. Gleditschia. Honey Locust. 



19. G. triacanthos, li.; Black, Sweet, or "Honey Locust. A large tree, with strong, 



heavy, hard wood; branches armed with stout, triple or branched thorns; pods 



flat, often twisted. 



16. Ceecis. Red-bud. 



20. C. Canadensis, L.; Red-bud, Judas tree. Small tree, with hard, heavy, but not 



strong wood. Lvs. broadly ovate-cordate, entire, acuminate, smooth, but 

 villous on the veins beneath; showy red flowers preceding the leaves. 



(Order Rosacese.) 

 17. Pkunus.* Plum ok Cheeky. 



21. P. Americana, Marsh.; Wild or Canada Plum. A small, thorny tree; wood heavy, 



hard, strong; lvs. conspicuously pointed, ovate or somewhat obovate, coarsely 

 or doubly serrate, very veiny; flowers in early spring. 



22. P. angustifolia, Marsh.; Hog Plum, Chicasaw Plum. A small tree or low shrub, 



scarcely thorny; wood heavy, soft, not strong; lvs. nearly lanceolate, acute, 

 finely serrulate; flowers in early spring. 



23. P. serotina, Ehrh; Wild Black Cherry. Large tree, branches reddish-brown; 



wood light, hard, strong; lvs. oblong, taper-pointed, serrate, with incurved, 

 callous teeth; fls. in racemes, late in spring; fr. purplish black. 



18. Pykus. Apple. 



24. P. coronaria, L.; American Crab Apple. A small tree; lvs. ovate, somewhat cor- 



date at base, cut-serrate, or lobed; fls. handsome, fragrant; fr. greenish. 



19. Cbat^gus. Thokn. 

 Lvs. with a tapering base, and cut or serrate above the middle (a). 

 Lvs. toothed, cut or cut-lobed (b). 

 a. Lvs. shining above, serrate toward the apex (25). 

 a. Lvs. dull, unequally toothed above (28). 



b. Glabrous; lvs. thin, usually abrupt at base (26). 



b. Pubescent; lvs. thickish; petioles slightly margined (27). 



*P. Virginiana L., Choke Cherry, with lvs. oval, oblong or obovate, abruptly pointed, very sharply 

 serrate with slender teeth, and fr. red turning to dark crimson, though excluded by Prof. Sargent, is 

 sometimes arborescent with ua. 



