226 LEGUMINOSAE. 



Annuals; flowers solitary or sometimes two on the peduncles. 



Peduncles very short, the flowers nearly sessile. H. denticulata. 



Peduncles usually exceeding the leaves. 



Flowers 3-4 mm. long; leaflets oblong to ovate, usu- 

 ally glabrous. H. parviflora. 

 Flowers 5-6 mm. long; leaflets ovate to lanceolate, usu- 

 ally villous. H. americana. 

 Perennials; flowers in umbels. 



Pods curved, pubescent, 1 or 2-seeded; flowers yellow. H. decumbens. 

 Pods straight, glabrous, many-seeded; flowers at least in 

 part not yellow. 

 Leaflets 9-15; flowers purple. H. crassifolia. 



Leaflets 5-9, glabrous or nearly so. 



Peduncles usually naked; corolla with yellow stand- 

 ard and white wings. H. bicolor. 

 Peduncles with a bract at the umbel; corolla with 



yellow standard and purple wings. H. gracilis. 



Hosackia denticulata Drew. Nearly glabrous; stems erect, 15-40 cm. high; 

 leaflets 2-6, obovate or oblanceolate, thick; peduncles shorter than the leaves; 

 flowers solitary; calyx-lobes denticulate; petals yellow or reddish. 



In low ground, not common. 



Hosackia parviflora Benth. Glabrous; stems slender, 10-20 cm. high, 

 erect or ascending; leaflets 3-5, mostly oblong, 12-15 mm. long; flowers very 

 small, 4 mm. long, solitary or in twos; petals yellow or the standard pinkish. 



In dry soil, common. 



Hosackia americana (Nutt.) Piper. Annual, erect, usually branched, 30-60 

 cm. high; leaves 3-foliolate, or the upper 1-foliolate, nearly sessile; leaflets 

 ovate or lanceolate, silky-pubescent, acuminate, stalked, 6—20 mm. long; 

 stipules gland-like, dark; peduncles as long as or longer than the leaves; 

 flowers pink, 4-6 mm. long; calyx villous, the slender lobes twice as long as the 

 tube, nearly equalling the corolla; pod linear, narrow, often reflexed, glabrous 

 and shining, 2—3 cm. long. 



Common and very variable. 



Hosackia decumbens Benth. Perennial, many-stemmed from a thick 

 woody root, villous and more or less tomentose; stems decumbent, branched, 

 30-60 cm. long; leaflets 5-7, oblong to obovate, cuneate at base, mostly acute, 

 6-10 mm. long; stipules minute, spine-like, deciduous; peduncles scarcely 

 longer than the leaves; flowers yellow, in 5-10-flowered umbels, each umbel 

 with a 1-3-foliolate bract; calyx silky, the teeth as long as the tube; pods 

 falcate, pubescent, mostly 2-seeded. 



In dry prairies. 



Hosackia crassifolia Benth. Glabrous; stems erect, 30-60 cm. high; 

 leaflets 9-15, oblong or obovate; flowers dull purple, in umbels; pods thick, 

 5 cm. long. 



In open pine woods, Mason County, Washington, and southward. 



Hosackia bicolor Dougl. Perennial, glabrous or nearly so throughout, 

 erect or decumbent, 30-50 cm. high, stout; leaflets 5-9, obovate, mostly obtuse, 

 cuneate at base, 1.5-2 cm. long; stipules broad, scarious; peduncles exceeding 

 the leaves; flowers nearly sessile, spreading, 3-7 in an umbel; calyx about 6 mm. 

 long, the teeth shorter than the campanulate tube; corolla yellow, the wings 

 white, 2-2.5 cm. long; pod linear, narrow, glabrous, 4-6 cm. long. 



In wet ground, not rare. 



Hosackia gracilis Benth. Glabrous; stems weak, decumbent, 15-30 cm. 



