362 PAPILIONACEAE 
A. tuberosa, (L.) Moench. (Fig. 1, pl. 82.) Grounp-NuT. A vine, 
climbing on shrubs and trees often found along banks of streams. The 
underground tubers are said to be edible. Flowers brownish-purple. 
Moist grounds. July-Sept. 
26. GALACTIA, P. Browne 
Prostrate or twining herbs, with 3-foliate leaves and small stipules, 
which fall early. Calyx 4-lobed, the lobes narrow and sharp at apex and 
nearly equal in length. Standard orbicular, keel nearly straight, wings 
narrow. Stamens, 9 united, 1 free. Pod straight linear, few seeded. 
1. G. regularis, (L.) BSP. (Fig. 8, pl. 81.) Mirk Pea. Mostly” 
prostrate, smooth. Leaflets elliptic, oblong, obtuse at each end, shining 
above, somewhat hairy beneath, about 1 to 14 in. long. Flower cluster 
from leaf axils on somewhat lengthened flower-stalks, the cluster about as 
long as leaves. Flowers purple, greenish on the outside, rather large. 
Dry soils, near the coast, southern New York, and southward. Aug.-Sept. 
2. G. volubilis, (L.) Britton, Downy Mirx Pea. Generally twin- 
ing, stem covered with silky hairs, several feet long. Leaflets similar in 
form to No. 1. Silky and whitish beneath. Flower cluster generally ex- 
tending beyond the leaves. Flowers smaller than those of No. 1. Dry 
soils, southern part of our area. June-Aug. 
27. PHASEOLUS, L. 
Herbaceous twining or trailing plants, with 3-foliate leaves with stipules 
which fall early. Flowers in clusters from the leaf axils. Calyx 5- 
toothed or lobed, the upper two somewhat united. Standard orbicular, 
keel spirally twisted. Pod sickle-shaped or nearly straight. 
I. P. polystachyus, (L.) BSP. Fig. 5, pl. 83.) WitpoBeanm 
BEAN VINE. (P. perennis, Walt.). Vine, often many feet long, climb- 
ing and twining on other plants, often forming extensive masses of the 
light green vine. Leaflets large, broadly egg-shaped, 14 to 3 in. long, 
acute at apex, rounded at base. Flower clusters narrow, long, loose 
flowered. Flowers light purple. Pod about 2 in. long, with compressed 
dark purple seeds. Common. July-Sept. 
2. P.helvolus, L. (Fig. 2, pl. 83.) Traminc Witp BEAN. (Stro- 
phostyles helvola, Britton.) Stem slender, trailing, 2 to 8 ft. long, rather 
rough-hairy. Leaflets egg-shaped, acute or obtuse at apex. Flower-stalk 
much longer than the compound leaves. Flower clusters of few (2 to 
6) flowers. Corolla greenish-purple. Keel not twisted, but slender and 
curved. Sandy shores and river banks, eastern section of our area. 
July-Oct. 
28. STROPHOSTYLES, Ell. 
Similar to Phaseolus, but keel of corolla is not spirally coiled, but is 
strongly incurved. 
S. umbellata, (Muhl.) Britton. (Fig. 4, pl. 83.) Pryxk Witp Bean. 
tesembles Phaseolus helvolus, but the leaflets are often narrower and 
often with one or more shallow lobes at border, Long Island and south- 
ward. July-Sept. 
