138 American Midland Naturalist Monograph No. 7 



11. Stem retrorsely strigose; leaflets elliptical; petioles 1-2 mm 

 long; pods not glandular; fields and roadsides; introd. from 

 Asia. Aug. -Oct. Japan Bush-clover. Common Lespedeza 



" L. striata (Thunb.) H. & A. 



1 1 . Stem antrorsely strigose to nearly glabrous ; leaflets obovate, 

 ciliate, often emarginate; petioles 4-10 mm long; pods 

 glandular; fields and roadsides; recently introd. from Asia. 



Sept. -Oct. Korean Lespedeza L. stipulacca Maxim. 



1. Plants suffruticose or somewhat shrubby, 1-3 m tall. 



12. Leaflets elliptical, acute, 2-6 cm long; flowers rose-purple, 

 10-12 mm long, in racemes forming terminal panicles 30-60 

 cm long; fields and roadsides, occasional, native of Japan. 



Aug.-Sept L. thunbergii (DC.) Nakai 



12. Leaflets linear-oblanceolate, cuneate, 1-2 cm long; flowers 

 7-9 mm long, whitish with purple spots, 1-4 in the leaf- 

 axils; plants virgate; fields and roadsides; extensively planted 

 as a forage crop and soil-binder, now tending to spread from 

 cult.; introd. from China and Japan. Aug.-Oct. Chinese 

 Bush-clover L. cuneata (Dum.-Cours. ) G. Don 



29. Styiosanthes Sw. — Pencil-flower 

 S. bi flora (L.) BSP. Diy soil in woods and on bluffs, chiefly in the 

 s. half of 111. June-Aug. 



30. Vicia L. — Vetch 

 1 . Flowers solitary or in pairs, axillary, nearly sessile ; annuals. 



2. Flowers 2-2.5 cm long; leaflets oblanceolate to oval; pods 

 brown; fields and waste places; escaped from cult.; introd. 

 from Eur. July- Aug. Spring Vetch V. satiua L. 



2. Flowers 10-18 mm long; leaflets linear to linear-oblong; pods 



black when matinee; fields and waste places; escaped from 



cult.; introd. from Eur. July-Aug. Common Vetch 



V. angustifolia Reich. 



1. Flowers in 3-40-flowered racemes on axillary peduncles. 



3. Racemes one-sided, densely 10-30-flowered. 



4. Flowers 9-12 mm long, bluish purple (rarely white); calyx 

 rounded or only slightly gibbous at base, the pedicel basal; 

 pods 1.5-2 cm long; seeds 2.5 mm in diameter, black; road- 

 sides and fields, occasional; introd. from Eur. June-Aug. 



Tufted Vetch V. cracca L. 



4. Flowers 13-18 mm long, crimson, fading blue, rarely white; 

 calyx strongly gibbous at base, the pedicel appearing lat- 

 eral; pods 2.5-3.5 cm long; seeds 3-4 mm in diameter, dark 

 brown. 

 5. Plants conspicuously pilose; lower calyx teeth about 3 inm 

 long; roadsides and fields, common; nat. from Eur. 

 June-Sept. Winter Vetch V. villosa Roth 



