622 Leguminosae Phaseolus 



depression is a small prairie of about 3 acres surrounded by red birch and 

 pin oak. In the "flats" are a number of plants of the Coastal Plain. The 

 reports from Kosciusko and Putnam Counties, no doubt, should be re- 

 ferred to some other species. 



In the Mississippi Valley from Ind. to Kans., southw. 



3901. PHASEOLUS [Tourn.] L. Bean 



1. Phaseolus polystachyus (L.) BSP. Wild Bean. Map 1281. Infre- 

 quent in the southern part of the state as indicated on the map. Probably 

 in a few counties farther north but the reports from the northern part of 

 the state I think should be referred to some other species. I have the 

 Van Gorder specimen from Noble County and it is Amphicarpa bracteata. 

 Wilson says "Common" in Hamilton and Marion Counties. This report 

 should be referred to one of the Amphicarpa species which are frequent 

 and which he does not report. Peattie's and Pepoon's reports from Lake 

 County may be correct. Since having seen large, entire-leaf forms of 

 Strophostyles helvola labeled as this species, I suspect that some of our 

 reports have been wrong determinations. The lower surfaces of the leaf- 

 lets of Phaseolus polystachyus are velvety to the touch and those of 

 Strophostyles helvola are not. 



Conn, to Fla. and La. and northw. in the Mississippi Valley to Ind., 111., 

 and Mo. ; also reported northw. to Minn, and Nebr. 



3901A. STROPHOSTtLES Ell. Trailing Wild Bean 



Leaflets of an ovate type, one or both sides more or less contracted about the middle so 

 that the leaflets appear 3-lobed or 2-lobed or one or both sides so shallowly con- 

 tracted that the side or sides are only sinuate, in some specimens only a very few 

 of the leaflets may be contracted and the remainder may be of a regular, ovate 

 type, the upper surface nearly glabrous and the lower sparingly pubescent; calyx 

 tube generally 2-2.5 mm long, more or less sparsely pubescent with long hairs, 

 sometimes only the lower lobe pubescent; lower calyx lobe longer than the tube, 

 2.5-5 mm long; flowers mostly 7-10 mm long, the banner about 10 mm wide; pods 

 generally 5-9 cm long, strigose-pubescent, rarely nearly glabrous; seed oblong, 



quadrangular, 5-6.5 mm long and about 3 mm wide 1. S. helvola. 



Leaflets of a narrow-ovate, lanceolate, or linear-oblong type, never with contracted 

 sides; pods 2.5-4.5 cm long; seed mostly 3-3.5 mm long and about 2.5 mm wide. 

 Flowers the largest of the three species, mostly 9-12 mm long, the banner 12-16 mm 

 wide; leaflets generally of a narrow-ovate and less often of a lanceolate type, 

 glabrous to sparsely pubescent above and pubescent below; calyx tube 1.5-2 mm 

 long, generally most of the surface strigose-pubescent; lower lobe of calyx tube 

 longer than the tube, 2-2.5 mm long; pods mostly 4-4.5 cm long, strigose-pubes- 

 cent or nearly glabrous; seed 3-3.5 mm long and about 2.5 mm wide 



2. S. umbellata. 



Flowers the smallest of the three species, mostly 5-6 mm long, banner 5-6 mm wide; 

 leaflets lanceolate to linear-oblong, pubescent above and beneath; calyx tube 

 1-1.5 mm long, entirely covered with long, loose hairs; lower lobe of calyx 

 longer than the tube, usually 1.5-2 mm long; pods 2.5-3.5 cm long, closely long- 

 pubescent; seed 2.6-3 mm long and 2-2.5 mm wide 3. S. leiosperma. 



1. Strophostyles helvola (L.) Britt. Map 1282. Infrequent through- 

 out the state as shown on the map. There are no reports from the north- 



