long as the poo. 



Leaflets densely woolly or velvety beneath 

 Leaflets glabrate or appressed-pubescent be 



Leaflets linear to linear-oblong; petalife 



LEGUMINOSAE (PULSE FAMILY) 523 



Calyx 4-5 mm. long, much shorter than the pod. 



Leaflets densely velvety beneath 4. L. Briltonii. 



Leaflets appressed-pubescent or sparingly villous beneath . 5. L. Nuttallii. 

 Calyx 6-9 mm. long, about equaling the pod . . . 6. L. Manniana. 



d. Few if any of the peduncles exceeding the leaves e. 



e. Calyx of the petaliferous flowers 3-5 mm. long, rarely half as 

 long as the pod. 



beneath . . . . 7. L. Stuvei. 

 ascent beneath. 

 _ ; petaliferous inflorescences 



mostly sessile or subsessile 8. Z. virginica 



Leaflets oval to oblong ; petaliferous inflorescences often 



short-peduncled 9. Z. frutescens. 



e. Calyx of the petaliferous flowers 6-8 mm. long, two thirds as 



long as the pod 10. Z. simulata. 



b Flowers all alike and perfect, in close spikes or heads ; corolla whitish 

 or cream-color, with a purple spot on the standard, about the 

 length of the calyx /. 

 f. Peduncles mostly shorter than the dense subglobose heads ; flowers 



closely appressed-ascending. 

 Stem pubescent with long spreading or loosely ascending hairs, 



rarely glabrate ; calyx 8-12 mm. long 12. Z. capitata. 



Stem short-pubescent with chiefly appressed hairs or glabrate ; 



calyx 5-7 mm. long 18. Z. angustifolia. 



f. Peduncles elongate, chiefly equaling the cylindric or subcylindric 



spikes. 



Spikes thick-cylindric, 1-1.5 cm. thick. 



Stems with long spreading or loosely ascending pubescence ; 

 leaflets oblong to orbicular; flowers spreading or loosely 



ascending 11. Z. Mrta. 



Stems chiefly appressed-pubescent or glabrate; leaflets linear to 



linear-oblong ; flowers appressed-ascending . . . .18. L. angustifolia. 

 Spikes slender-cylindric, 5-8 mm. thick . <, . . . . 14. L. leptostachya. 

 a. Stipules and bracts broad and scarious ; calyx-lobes broad ; annual . 15. Z. striata. 



1. L. prociimbens Michx. Stem trailing, prostrate or nearly so, soft-downy 

 with short spreading hairs ; leaflets downy, oval or obovate-elliptical, 6-18 mm. 

 long ; peduncles very slender, few-flowered ; keel equaling the wings ; pod small, 

 roundish. Dry sandy soil, chiefly near the coast, s. N. H. to Fla. and Tex. ; 

 inland in Miss, basin to Mo., 111., and Ind. Fl. late Aug., Sept. 



2. L. rdpens (L.) Bart. Like the preceding but more slender and glabrous 

 or finely appressed-pubescent; stipules subrigid, mostly 2-4.5 mm. long. 

 Sandy or rocky soil, chiefly near the coast, Ct. to Fla. and Tex., inland in 

 Miss, basin to Ky., Ind., and Minn. ; common and said to flower earlier than 

 the preceding. 



3. L. violacea (L.) Pers. Stems upright or spreading, slender, branched, 

 2-7 dm. high, rather sparsely leafy and sparingly pubescent ; stipules setaceous, 

 mostly 5-8 mm. long; leaflets thin, broadly oval or oblong, finely appressed- 

 pubescent beneath, those of the stem-leaves mostly 2-5 cm. long, 1.2-2.2 cm. 

 broad; peduncles very slender, loosely few-flowered, mostly longer than the 

 leaves ; petals 6-8 mm. long, the keel often the longest ; pod ovate, 4-6 mm. 

 long, minutely strigose. Dry copses, s. N. H. and Vt. to Minn., e. Kan., La., 

 and Fla., chiefly at low altitudes. July-Sept. Var. PRA^EA Mackenzie & 

 Bush. Principal leaflets 1-2 cm. long, 0.5-1 cm. broad. (L. prairea Britton.) 

 - Dry prairies, Mo. and Kan., southw. 



4. L. Brittbnii Bicknell. Densely cinereous-velvety or -tomentose; stems 

 loosely ascending or arching, 6-13 dm. long ; leaves mostly short-petioled, the 

 thick oblong or lance-elliptic leaflets velvety beneath, cinereous-pilose or glabrate 

 above, the principal ones 1.5-4 cm. long; inflorescences numerous along the 

 upper half of the stem or on short lateral branches ; peduncles various, some 

 shorter than the leaves, others elongate ; calyx 4-5 mm. long ; corolla 6-8 mm. 

 long, pink and purple, the standard deeper purple at base ; pod tomentose, 

 sharply acute or acuminate. Dry soil, near the coast, e. Mass, to Md. ; local 

 and little known. 



5. L. Nuttallii Darl. Stems erect, stoutish, 6-12 dm. high, villous; leaves 

 mostly long(l-3 cm.)-petioled, the oval leaflets glabrous or glabrate above, 

 appressed-pubescent or sparingly villous beneath, the principal ones 2.5-4 cm. 

 long ; peduncles of various lengths; calyx 4-6 mm. long, much, shorter than the 



