OF ARTS AND SCIENCES. 133 



'" Lathtrus Nevadensis.* Slender, usually a spaa high, fiuely 

 pubescent or nearly glabrous : stipules semi-sagittate, the lobes nar- 

 rowly acuminate; leaflets thin, two to four pairs, ovate to ovate- 



* The North American species of this genus may be arranged as follows : — 



§ 1. Rhachis of the leaves tendril-bearing : peduncles mostly equalling or ex- 

 ceeding the leaves : pod sessile. 



* Annual : racemes 1-2-flowered. ' 



1. L. ptrsiLLTJS, Ell. Glabrous ; stems winged : leaflets 2, narrow : flowers 

 small, purple : pod linear : seeds minutely tuberculate. — S. Carolina to Texas. 



The L. Engelmanni, Bischof in Linusea, 14. 132 (Litt.-Bericht), from near 

 Fort Gibson, Arkansas, may be distinct. It is described as with oblong leaves, 

 ciliate stipules, and seeds " ruguloso-exsculptis." 



* * Perennials : racemes several-flowered. 



t- Stipules large, ovate or somewhat semi-hastate with broad lobes : stout and 

 glabrous, excepting forms of L. marilimus. 



2. L. MARiTiMUS, Bigel. Stipules broadly ovate, acute : leaflets 6 to 10, 

 thick, ovate-oblong, obtuse or acutish, 1 or 2 inches long, nearly sessile : 

 flowers large (9 lines long), purple: calyx-teeth sparingly ciliate. — Seashore, 

 from New Jersey and Oregon northward, and on the Great Lakes. The high 

 northern and arctic form is low and more slender, and more or less densely 

 pubescent. 



'■' 3. L. POLYPHYLLUS, Nutt. Stipules smaller, triangular, scarcely longer 

 than broad, acute or acuminate ; leaflets 12 to 20, thin, oblong, distinctly petio- 

 lulate : otherwise like the last. — N. California and Oregon, near the coast. 



^ 4. L. OCHEOLEDCUS, Hook. Stipules semi-cordate ; leaflets 6 to 8, thin, 

 ovate, obtuse or acutish: flowers smaller, ochroleucous. — Northern United 

 States from New England to Washington Territory, and north to Lake AYiu- 

 nipeg. 



5. L. SULPHDREUS, Brewer. Glaucous : stipules semi-cordate or semi-sagit- 

 tate ; leaflets 6 to 20, oblong-ovate to linear-lanceolate, about an inch long, 

 acute : flowers sulphur-yellow, 6 lines long. — In the Sierra Nevada.' 



•t- -t- Stipules narrower, semi-sagittate, the lobes usually lanceolate, acuminate : 

 flowers purple or purplish. 



*+ Leaflets 8 to 12 : peduncles rather many-flowered. 



•^ 6. L. vENOSUS, Muhl. Stout, climbing, usually somewhat downy : stipules 

 mostly narrow and short ; leaflets oblong-ovate, mostly obtuse, about 2 inches 

 long : flowers 6 to 8 lines long : calyx densely pubescent to nearly glabrous : 

 ovary smooth. — Through the Atlantic States to. the Saskatchawan, and thence 

 to Washington Territory. 



, Var. Californicus. Stems very stout, often strongly winged : stipules 

 broader ; leaflets acute and narrower : flowers larger. — Sonoma County to 

 Monterey, California, and in the foothills of the Sierra Nevada ; near water. 

 Intermediate forms occur. 



