Pea Family. 37 



D. alopecuroides Willd. Stem erect, 1-3 feet high, glabrous; leaflets 15- 

 41. oblaneeolate or oblong; calyx densely villous, teeth linear-lanceolate, 

 plumose. Roadsides and waste places; July-September; frequent. (Parntscla 

 rhdca (L.) Britton.) 



D. laxiflora Pursh. Stem 1-4 feet high, from a long thick root, smooth, 

 much branched: leaflets 5-11. linear-oblong or linear: flowers in small loose 

 spikes: calyx villous; teeth subulate, plumose; petals white; stamens 9. 

 Loess hills: June-August: common in the west counties; Woodbury. Harri- 

 son, Monona. Pottawattomie, and Fremont counties. (P. enitcnndra (Nutt.) 

 Britton ) 



PETALOSTEMON Mx. Prairie Clover. Perennial herbs, with odd- 

 pinnate leaves, miuute stipules, and small flowers in peduncled oblong heads. 

 Calyx 5-toothed. Sepals 5, much alike, 4 of them borne on the top of the 

 cleft sheath of monodelphous filaments and alternate with the 5 anthers, 

 the standard cordate or oblong, inserted in the bottom of the calyx. 



P. violaceus Mx. Glabrous or somewhat pubescent; leaflets 5, narrowly 

 linear; flowers in a dense globose or oblong head, violet purple. Prairies; 

 July-August; common. (Kuhnixtem purpurea (Vent.) Mac M.) 



P. candidus Mx. Glabrous; leaflets 7-9, lanceolate or oblong-linear; 

 flowers in an oblong or cylindrical spike, white. With the last. (K. Candida 

 (Willd.) Kuntze.) 



P. villosus Xutt. Decumbent or ascending, densely villous; leaflets 13-17, 

 linear or oblong, spikes cylindric, villous; flowers rose-purple. Reported 

 from Story county. (Hitchcock.) (K. vlllosa (Nutt.) Kuntze.) 



TEPHROSIA Pers. Ours a perennial herb, with odd-pinnate non-punctate 

 leaves, and flowers in a terminal often compound raceme. Calyx teeth 5, 

 nearly equal; bractlets none. Petals clawed; standard large, orbicular, 

 silky externally; keel bluntish, cohering with the wings. Pod linear, flat, 

 several-seeded. 



T. virginiana Pers. Ooat'x Rue. Catgut. Stem 1-3 feet high, erect, hairy; 

 leaflets 9-20, linear-oblong, mucronate, odd leaflet notched or obcordate and 

 base cuneate; flowers yellowish white, marked with rose or purple, short- 

 pedicelled, large, clustered; pod villous, bristle-pointed. Sandy soil; June- 

 July; infrequent; Winneshiek, Allamakee, Fayette, Jackson, Delaware, Scott, 

 Muscatine, Louisa, and Johnson counties. (Cracca virginiana L.) 



R,OBINlA L. Ours a small tree, with odd-pinnate leaves, spine-like 

 stipules, and flowers in hanging axillary racemes. Calyx short, 5-toothed, 2 

 upper teeth more or less united. Standard large, reflexrd, but little longer 

 than the keel; wings free. Stamens diadelphous, 9 and 1. Pod linear, flat, 

 several-seeded, margined. 



R pseudacacia L. False Acacia. Leaflets ovate-oblong; flowers showy, 

 fragrant, white; pod glabrous. Roadsides and waste places; May; an escape 

 from cultivation, frequent in the older settlements. 



ASTRAGALUS L. Perennial herbs, with odd-pinnate leaves, and racemose 

 or spicate flowers. Calyx 5-toothed. Corolla slender, much exceeding the 

 calyx; standard narrow, equaling or exceeding the obtuse keel, reflexed or 

 spreading. Stamens diadelphous, 9 and 1. Pod varies, usually turgid, 2- 

 valved, 1 or 2-celled, few-many-seeded. 



* Pod 2-celUd. 



A. caryocarpus Ker. Ground Plum. Low, prostrate, whitish pubescent; 

 root long, descending; leaflets 11-21, narrowly oblong; calyx tubular; corolla 



