360 PAPILIONACEAE 
leaf-like. Leaflets 3 to 5 pairs, broadly oval or egg-shaped. Flowers 
yellowish-white in clusters of 5 to 9, % in. long. Pod straight, beak 
curved. Distributed through most of our area. May-July. 
22. CENTROSEMA, DC. (Bradburya, Raf.) 
Slender twining herb, with 3-foliate leaves, a pair and an odd one. 
Both leaves and leaflets stipulate. Flowers in axillary clusters or solitary, 
showy. Calyx short, bell-shaped, its teeth nearly equal. The large stand- 
ard erect and rounded with a spur-shaped projection on the back toward 
the base. Wings pear-shaped, keel broad and curved. Style bearded. 
Pod long and slender, ‘flat with elengaved point. Stamens, 9 united, 1 
more or less free. 
C. virginianum, (L.) Benth. Spurrep ButTrerrty Pea. Somewhat 
rough hairy, stem trailing 2 to 4 ft. long. Leaflets egg-shaped to oblong 
or linear, shining. Flower stalks each bearing 1 to 4 showy violet hand- 
some flowers about an inch long. Pods 4 to 5 in. long, very slender, with 
a long awl-shaped point. Southern part of our area. July-August. 
23.9 CE LLORTVAY te: 
Climbing, erect or trailing herbs or more or less woody vines. Leaves 
3-foliate, a pair and an odd one. Learlets with stipulate bracts. Calyx 
tubular, 5-toothed. Flowers large, the standard rounded, erect with a 
distinct depression at summit and with no spur at the back. Stamens, 
9 united, 1 more or less free. Pod slender, flattened, knotty, several- 
seeded. 
C. mariana, L. (Fig. 6, pl. 83.) Butrtrerrtry Pea. Stem 1 to 3 ft. 
high, reclining or partly erect, smooth. Leaflets oblong or very narrow 
ego-shaped. Stipules awl-shaped. Flower stalk short, with 1 to 3 showy 
pale blue flowers about 2 in. long. Southern part of our area. June-July. 
24. AMPHICARPA, Ell. (Falcata, Gmel.) 
Slender herbs, twining, the stem clothed with brown hairs. Leaves 
3-foliate, the leaflets broad. Flowers small, white or violet, in simple 
slender clusters (in our species). Flowers of two kinds, those of the: 
upper branches having colored petals, those on lower branches solitary 
without petals, but producing seed. 
1. A. monoica, (L.) Ell. (Fig. 4, pl. 81.) Wiitp Pra-nut. Hoe 
Prea-NuT. Leaflets 3, 4 to 2 in .long. Flower clusters simple and gen- 
erally nodding; flowers purplish or white. Bracts at base of flowers 
egg-shaped. Common. Aug.-Sept. 
2. A. Pitcheri, (T. and G.) Pitcner’s Hoa Pea-nut. Leaflets 3, 
2 to 4 in. long. Bracts below flowers orbicular. Western New York. 
Aug.-Sept. 
25. APIOS, Moench. 
Twining vines climbing on trees and shrubs with leaves of 3 to 7 
leaflets. Flowers in compact, short, often branching clusters, brownish- 
purple or red. Calyx bell-shaped, somewhat 2-lipped. Standard very 
broad and turned backward, the long keel twisted. Stamens, 9 united, 
1 free. Pod linear. 
