LEGHMINOSAE (^I'ULSE FAMILY) 523 



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



Leaflets densely velvety beneath 4. Z. Briitonii. 



Leaflets appressed-pubescent or sparing-ly villous beneath . 6. L. Nuttallii. 

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

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



(). Calyx of the petaliferous flowers 8-5 mm. long, rarely half as 

 long as the pod. 

 Leaflets densely woolly or velvety beneath .... 7. L, Stti/vei. 

 Leaflets glabrate or appressed-pubescent benetfth. 

 Leaflets linear to linear-oblong; petaliferous Infloreseenoes 



mostly sessUe or subsessile 8. Z. virginicc 



Leaflets oval to oblong ; petaliferous inflorescences often 



short-jieduncled 9. L. frutescent, 



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



long as the pod 10. Z. aintulata. 



&• 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 /, 



/, 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. capiiatn. 



Stem short-pubescent with chiefly appressed hairs or glabrate ; 



calyx 0-T mm. lon^ 18. Z. angustifolia. 



/t 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. L, hirta. 



Stems chiefly appressed-pubescent or glabrate; leaflets linear to 



hnear-oblong ; flowers appressed-ascending , . . . 18. Z. angusUfoUa. 



Spikes slender-cylindric, 5-3 mm. thick 14. Z. leptostachy a . 



j6, Stiptiles and bracts broad and scarious ; calyx-lobes broad ; annual . 15. Z. striata . 



1. L. prociiinbens 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 soU, chiefly near the coast, s. N. H. to Fla. and Tex. ; 

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



2. L. ripens (L.) Bart. Like the preceding hut 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. violicea (L.) Pers. Stems upright or spreading, slender, branched, 

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

 mostly 6-8 mm. long; leaflets thin^ broadly oval or oblong^ finely appressed- 

 pubescent beneath, those of the stem-leaves mostly 2-6 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. PKAfREA Mackenzie & 

 Bush. Principal leaflets 1-2 cm. long, 0.6-1 cm. broad. (L. prairea Britton.) 

 — Dry prairies. Mo, and Kan., sonthw. 



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. 

 lon^, pink and purple, the standard deeper purple at base ; pad tomentose, 

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

 and little known. 



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

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

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

 long ; peduncles of various lengths; calyx 4-5 mm, long, much shorter than the 



