FLORA OF THE DISTRICT OF COLUMBIA. 23 



Mature leaves entire, those on young shoots rarely lobed or toothed. 



Leaves dotted with black glands, rounded at the apex. Flowers yellow; fruit a 



capsule; low shrubs HYPEBICACEAE (p. 204). 



Leaves not gland-dotted, usually pointed at the apox. 

 Leaves, at least the upper ones, in whorls of 3, glabrous, with stipules; flowers 

 in dense spheric heads. Shrubs or small trees. . .Cephalanthus (p. 257). 

 Leaves opposite, never whorled, the uppermost rarely united by their bases 

 and thus perfoliate; stipules none; flowers not in spheric heads. 

 Leaves evergreen, tliick and leathery. Corolla gamopetalous, pink or red; 

 fruit a capsule; pedicels glandular-pubescent; large or small shrubs. 



Kalmia (p. 223). 

 Leaves deciduous, comparatively thin. 



Plants climbing or trailing vines. Leaves rounded at the apex; flowers 

 axillary, the corolla tubular or funnelform; fruit a several-seeded 



black or red berry Lonicera (p. 259). 



Plants erect shrubs or trees. 

 Leaves rounded at the apex. Flowers in axillary clusters; fruit a 



2-seeded white or red berry; shrubs Symphoricarpos (p. 259). 



Leaves pointed at the apex. 

 Blades of the leaves broadest at the base and there truncate to cordate. 

 Trees; leaves pubescent, large (mostly 12-25 cm. long); flowers 

 large (about 4-5 cm. long). 



Flowers purple; fruit a large ovoid capsule Paulownia (p. 250). 



Flowers white, spotted with yellow and purple; fruit a very long 



terete capsule Catalpa (p. 254). 



Blades of the leaves broadest near or above the middle, obtuse or 

 usually acute or tapering at the base. 

 Flowers in loose or dense panicles; stamens 2. Fruit a 1-3-seeded 



black berry or drupe; shrub OLEACEAE (p. 227). 



Flowers in flat-topped cymes, or rarely in a dense head surrounded 

 by 4 petal-like white bracts; stamens 4 or 5. 

 Corolla and calyx 4-lobed; fruit 2-seeded, a blue, white, or red 



berry; shrubs or trees CORNACEAE (p. 219). 



Corolla and calyx 5-lobed; fruit 1-seeded, a black drupe; shrubs. 



Viburnum (p. 260). 



AA. LEAVES ALTERNATE. 

 B. PLANTS ARMED WITH SPINES. 



Leaves with 3 or more coarse longitudinal veins, these conspicuous up to the apex 

 and meeting there; flowers in umbels. Fruit a small black berry; vines. 



Smilax (p. 124). 

 Leaves with a mid vein, or sometimes palmately veined, the lateral veins not promi- 

 nently continued to the apex and not meeting the midvein there; flowers never 

 in umbels. 

 Leaves entire. 

 Blades of the leaves ovate, thin; flowers dioecious, green, the staminate in ra- 

 cemes, the pistillate in dense heads; fruit a spheric syncarp 7-10 cm. in 



diameter Toxylon (p. 141). 



Blades of the leaves lanceolate or spatulate, fleshy; flowers perfect, greenish 

 purple, solitary or clustered in the axils; fruit a small red berry. 



Lycium (p. 247). 

 Leaves toothed or lobed. 



Spines short, usually less than 1 cm. long; flowers small, the petals greenish 



yellow; fruit a many-seeded, very juicy berry; shrubs. 



Grossularia (p. 172). 



Spines long, usually over 1 cm. long; flowers large, the petals white; fruit a few- 

 seeded fleshy pome; shrubs or trees Crataegus (p. 178). 



