HOFFMANN: FLORA OF BERKSHIRE COUNTY. 289 
APIOS. Ground-nut. 
{Glycine 111. Fl. ed. 2.) 
A. tuberosa Moench. Ground-nut. — {G. Apios III. Fl. ed. 2.) 
Alluvial thickets and rich damp upland ; frequent in the valley. 
BAPTISIA. False Indigo. 
B. tinctoria (L.) R. Br. Wild Indigo. — Sandy soil in open 
woods ; common in the southern part of the valley. 
CASSIA. Senna. 
C. marilandica L. Wild Senna. — Roadsides in low ground; 
occasional in the southern part of the valley. West Stockbridge; 
Egremont; Sheffield. 
CORONILLA. 
C. VARIA L. — Occasionally established along roadside banks in the 
valley. 
C ROT AL ARIA. Rattle-box. 
C. sagittalis L. Rattle-box. — Sand-plain, Sheffield. 
DESMODIUM. Tick Trefoil. 
{Meibomia 111. Fl. ed. 2.) 
Key to Dcsmodium. 
1. Plant prostrate D. rotundifolium. 
2. Plant erect. 
a. Pod raised on a stalk many times lon<:jcr than the slightly toothed 
calyx. 
Leaves all crowded at the summit of sterile stems. . . . D. nudiflorum. 
Leaves all crowded at the summit of the stem from which arises the 
elongated panicle D. gramUjlorum. 
a'. Pod raised on a stalk little if at all surpassing the deeply cleft calyx. 
h. Stipules conspicuous and persistent; flowers rather large; stem 
smooth D. hracleosum. 
b'. Stipules mostly deciduous, small and inconspicuous. 
c. Flowers middle-sized, not very showy. 
Stem i)ubescent; leaflets .softlv and finely pubescent. 
D. DiUcnii. 
Stem smooth; leaflets smooth D. paniculatum. 
c'. Flowers 8 to 12 mm. long, showy; stem hairy . . . . D. canadense. 
