116 
RHYNCHOSIA 
Rhynchosia difformis (Elliott) DC., p. 956 
R. latifolia Nutt. ex Torrey & A. Gray, snout bean, p. 956 
R. minima (L.) DC., see excluded taxa 
ROBINIA, locust 
*Robinia hispida L., bristly locust, rose acacia, p. 907 
var. his 
R. pseudo-acacia L., black locust, p- 906 
SCHRANKIA (see MIMOSACEAE) 
SECURIGERA, crown vetch 
[S, G, M: CORONILLA] (Lassen, 1989) 
*Securigera varia (L.) Lassen [S, G, M: Coronilla varia L.] 
(Lassen, 1989), crown vetch, p. 911 
SENNA (see CAESALPINIACEAE) 
SESBANIA 
Sesbania exaltata (Raf) Rydb. ex A. W. Hill, bequilla [G, M: S. 
macrocarpa Muhlenb,] (Wilbur, 1989), p. 904 
STROPHOSTYLES, wild bean 
Strophostyles helvula Elli 
Srp ir (L.) Elliott, p. 951 
: var. missouriensis (S. Watson) Britton 
5 (Torrey & A. Gray) Piper, slickseed bean, p. 952 
S. umbellata (Muhlenb. ex Willd.) Britton, p. 951 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
