140 American Midland Naturalist Monograph No. 7 



32. Apios Medic. — Groundnut 

 1 . Flowers brownish-purple, the standard rounded or retuse at apex, 

 not appendaged rhizomes moniliforni, with several or many 

 globose or ellipsoid tubers; woods and thickets, throughout 111. 



July-Aug A. americana Medic. 



1. Flowers greenish-white, tinged with rose, the standard with a 

 spongy appendage; tuber solitary, 10-20 cm thick; Wolf Lake, 

 Union Co., G. D. Fuller in 1941 A. priceana B.L.Robins. 



33. Phaseolus L. — Kidney Bean 

 P. polystacliyus (L.) BSP. Woods and thickets, in s. 111. July-Sept. 



34. Glycine L. — Soybean 



G. max (L.) Merr. Extensively cultivated, and sometimes spon- 

 taneous; native of Asia. July-Sept. [Soja max (L.) Piper; G. soja (L.) 

 Sieb. & Zucc.]. 



35. Vigna Savi — Cow Pea 



V. sinensis (L.) Endl. Cultivated, and occasionally spontaneous; 

 native of Asia. July-Sept. 



36. Strophostyles Ell. — Wild Bean 

 1. Leaflets all entire; pods 2.5-5 cm long. 



2. Leaflets ovate to lanceolate; flowers pink, 10-12 mm long; pods 

 sparingly pubsecent; seeds mealy-pubescent; plants perennial 

 with elongate fruiting peduncles; sandy soil, infrequent, s. 



111. July-Sept .". ....S. urnbellata (Muhl.) Britt. 



2. Leaflets narrowly elliptical to linear; flowers 5-6 mni long, pur- 

 plish; pods 2.5-3.5 cm long, pubescent; seeds becoming glossy; 

 plants annual ; river banks or open woods, local ; nearly 

 throughout 111. July-Sept. [S. pauciflora (Benth.) Wats., 

 non Phaseolus pauciflorus Don] ....S. leiospenna (T. & G.) Piper 

 1 . Leaflets, at least some of them, usually shallowly lobed ; flowers 

 7-10 mm long, greenish-purple; pods 5-9 cm long, glabrous or 

 sparsely strigose; seeds 5-9 mm long; sandy soil along roads or 

 in open woods. July-Sept. \S. angulosa Ell.; S. diversifolius 

 Pars.; S. missouriensis (Wats.) Small] S. helvola (L.) Britt. 



37. Clitoria L. — Butter-fly Pea 

 C. mariana L. Dry woods, s. 111., rare. June-Aug. 



38. Pueraria DC. — Kudzu-vine 



P. lobata (Willd.) Ohwi. Planted for forage and to retard erosion; 

 tending to become weedy in s. 111.; native of e. Asia. Aug.-Sept. 



