24 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



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BB. PLANTS WITHOUT SPINES. 

 C. LEAVES ENTIRE. 



Blades of the leaves cordate at the base, about as broad as long; fruit a legume. 



Flowers red-purple, appearing before the leaves Cercis (p. 180). 



Blades of the leaves never cordate at the base, conspicuously longer than broad; 

 fruit not a legume. 

 Leaves bristle-pointed, at least when young; staminate flowers in catkins; fruit an 



acorn Quercus (p. 138). 



Leaves not bristle-pointed; flowers usually not in catkins; fruit not an acorn. 

 Stipules present, sometimes deciduous in age but always present on young 

 branches or about the buds. 

 Leaves thick and leathery, obtuse; flowers perfect, large, white, solitary. 



fruit large, woody, conelike Magnolia (p. 161); 



Leaves thin, acute; flowers dioecious, green, in catkins; fruit a very small 



capsule Salix (p. 132). 



Stipules none. 

 Leaves gland-dotted beneath. 



Flowers appearing before the leaves, yellow; plants with a spicelike odor; 



fruit usually red, l-seeded Benzoin (p. 162). 



Flowers appearing after the leaves, white or pinkish white; plants without a 



marked odor; fruit black, 10-seeded Gaylussacia (p. 224). 



Leaves not gland-dotted. 



Leaves evergreen, thick and leathery. Flowers showy, pink or red; fruit a 



capsule ERICACEAE (p. 222). 



Leaves deciduous, comparatively thin. 



Leaves large, 15-30 cm. long, obovate; fruit large (7-13 cm. long), pulpy, 

 yellowish. Shrubs or small trees, the young parts covered with a 

 rusty pubescence; flowers dark purplish brown or greenish, appearing 



before the leaves Asimina (p. 161). 



Leaves (except on young shoots or suckers) smaller, less than 15 cm. long; 

 fruits various, but never more than 2 or 3 cm. long. 

 Plants trees; flowers dioecious or polygamo-dioecious. 

 Fruit ovoid, l-seeded, black; flowers few or numerous, on slender 



peduncles Nyssa (p. 220). 



Fruit depressed-globose, several-seeded, yellowish ; flowers solitary or 

 few, on short stout peduncles or nearly sessile.. Diospyros (p. 227). 

 Plants shrubs; flowers perfect. 

 Leaves fleshy; branches usually recurved to the ground. Flowers 



greenish purple; fruit a red berry Lycium (p. 247). 



Leaves thin, not fleshy; branches erect or spreading. 

 Fruit a dry capsule. Flowers white or pinkish. 



ERICACEAE fp. 222). 

 Fruit a fleshy or juicy berry or drupe. 



Flowers without a corolla, appearing before the leaves, the calyx 



corolla-like, yellow; fruit l-seeded Dirca (p. 211). 



Flowers with a white or pinkish gamopetalous corolla, usually 

 appearing with or after the leaves; fruit 2-many-seeded. 

 Fruit 2-seeded; flowers in flat-topped cymes; leaves with numer- 

 ous conspicuous lateral veins Cornus (p. 220). 



Fruit several or many-seeded; flowers clustered or in racemes; 

 leaves with few and inconspicuous lateral veins. 



Vaccinium (p. 224.) 



