256 CONTEIBUTIONS FROM THE NATIONAL, HERBARIUM. 



Plants not parasitic. 



Plants climbing; leaves of three or more leaflets Clematis (p. 339). 



Plants erect, never climbing; leaves simple or compound. 

 Leaves toothed or lobed, or composed of several leaflets. 

 Leaves evergreen, thick and leathery, with small low teeth; flowers very 

 small, green, sessile in the axils of the leaves. 



CELASTRACEAE (p. 375). 

 Leaves deciduous, thin, with coarse teeth, or often lobed or compound; 

 flowers various. 



Petals distinct; fruit dry, winged ACERACEAE (p. 375). 



Petals united ; fmit fleshy, not winged . . . CAPRIFOLIACEAE(p. 412). 

 Leaves entire. 

 Leaves covered beneath with silvery and brownish scales; corolla none, the 



flowers greenish yellow; fruit red, juicy Lepargyrea (p. 378). 



Leaves somewhat hairy or glabrous, never scaly; corolla present, never 

 yellow; fruit never red. 

 Fruit a capsule; leaves evergreen, leathery, glaucous beneath; corolla 



10 to 15 mm. wide, bluish purple Kalmia (p. 390)- 



Fruit juicy; leaves deciduous, thin, green; corolla 5 mm. wide or less, 

 white or pink. 

 Leaves acute; flowers white, in terminal flat-topped clusters. 



Cornus (p. 387) 

 I eaves very obtuse; flowers pink, clustered in the leaf axils. 



Symphoricarpos (p. 413) 

 Leaves alternate. 

 Stems armed with spines or prickles. 

 Leaves compound, composed of 3 or more leaflets .... ROSACEAE (p. 358'i. 

 Leaves simple, toothed or lobed. 



Leaves very large (20 to 60 cm. wide), covered with prickles on the under side. 



Echinopanax (p. 383). 

 Leaves small, not prickly. 

 Leaves as broad as long or broader; stems with short slender prickles; 

 flowers in racemes, never white . . . GROSSULARIACEAE (p. 357). 

 Leaves longer than broad; stems with long stout spines; flowers in flat- 

 topped clusters, white Crataegus (p. 366). 



Stems never with spines or prickles. 



Leaves compound, composed of 5 or more leaflets. 

 Leaflets with spiny teeth, evergreen; flowers in racemes; fruit blue. 



BERBERIDACEAE (p. 344). 

 Leaflets never with spiny teeth, deciduous; flowers not in racemes; fruit 

 not blue. 

 Flowers white ; fruit juicy; leaflets 3 to 6 cm. long . . . Sorbus (p. 366). 

 Flowers yellow; fruit dry; leaflets 2 cm. long or less . . Potentilla (p. 359). 

 Leaves simple, entire or toothed. 

 Leaves covered with silvery scales on both surfaces . . . Elaeagnus (p. 378). 

 Leaves never with silvery scales on both surfaces. 

 Leaves entire. 



Flowers in catldns; leaves usually with stipules Salix (p. 319). 



Flowers not in catkins; leaves without stipules. 



Flowers in dense heads surrounded by small bracts; leaves white- 

 hairy Artemisia (p. 432). 



Flowers never in heads; leaves not white-hairy . ERICACEAE (p. 390). 



