LATHYRUS. LEGUMINOS^E. 157 



leaflets 5-6 pairs, obovate-oblong to linear, retuse, long-mucronate ; 

 flowers 1 or 2, 1012 lines long, red purple : pods linear, several-seeded, 

 black when mature ; seeds black, globose, 1--2 lines in diameter. Com- 

 mon in fields and waste places. Introduced from Europe. 



16 LATHYRUS L. Sp. 872. (PEA). 



Herbs with angled stems, more or less climbing by tendrils 

 that terminate the pinnate leaves, usually foliaceous stipules 

 and flowers in loose axillary racemes. Calyx campanulate, 

 5-toothed, the two upper ones more or less shorter than the 

 others. Corolla with the lateral petals but slightly if at all co- 

 herent to the keel, the upper one free. Stamens diadelphous or 

 nearly so, sheath of the filaments scarcely oblique. Style usu- 

 ally somewhat flattened and dilated above, bent nearly at a right 

 angle with the ovary, pubescent or villous in a line along the 

 inside, next the free stamen. Pods oblong, compressed, two- 

 valved, one-celled > not jointed, many ovuled. Seeds globular or 

 angular. 



* Rachis of the leaves tendril-bearing : peduncles mostly equalling 

 or exceeding the leaves : pods sessile : perennials : racemes several- 

 flowered. 



*- Stipules large, ovate or somewhat semihastate with bro?d lobes : 

 calyx-teeth ciliate. Stems not winged. 



L. inaritimiis Bigel. Fl. Bost. ed. 2, 268. Glabrous throughout: stems 

 stout, 1-2 feet high, from long slender rootstocks : stipules broadly ovate, 

 hastate, acute, 12-18 lines long; leaflets 3-5 pairs, ovate-oblong, 1-2 inches 

 long, obtuse or acutish, nearly sessile: peduncles a little shorter than the 

 leaves, 6-10-flowered; flowers purple and white, 9 lines long; calyx-teeth 

 sparingly ciliate, the upper ones triangular, half as long as the narrowly 

 subulate lower one : pods linear-oblong, 2 inches long, about 10-ovuled, 

 glabrous or pubescent, straight. On sandy banks near the sea, northern 

 California to Alaska and the Atlantic coast : and Europe. 



L. polyphyllus Nutt. T. &. G. Fl. i, 274. Glabrous throughout: stems 

 stout, 2-4 feet high, branching : stipules triangular, as broad or broader 

 than long, acuminate, often more or less dentate; leaflets 6-10 pairs, thin, 

 oblong, obtuse or acutish, distinctly petiolulate, 1-2 inches long : pedun- 

 cles slender, shorter than the leaves, 6-10-flowered; flowers purple, 6-8 

 lines long; calyx teeth ciliate, the upper pair short, triangular, the other 

 three nearly equal, subulate, 3-4 lines longer: pods linear-oblong, 2 inches 

 long, 2-10-seeded. In forests, Puget Sound to California, near the coast. 



L. ochroleucus Hook. Fl. i, 159. Glabrous and a little glaucous : stems 

 slender 1-3 feet high: leaflets 3-4 pairs, ovate or ovate-lanceolate, dis- 

 tinctly petiolulate; stipules semicordate, entire or obtusely toothed below: 

 peduncles 7-10-flowered; flowers ochroleucous, 5-6 lines long; calyx some- 

 what truncate above, the upper teeth broadly triangular, scarcely half the 

 length of the oblong or lanceolate lateral ones, the lower one lanceolate 

 and a little the longest : pods glabrous, linear-oblong. In forests, Puget 

 Sound to the Arctic Circle and across the continent. 



L. snlphureus Brewer in Gray Proc. Am. Acad. vii, 399. Rather 

 stout, 1-4 feet high, glabrous : stipules semisagittate, acuminate, 6-10 lines 

 long, the lower half sometimes toothed; leaflets 3-5 pairs, oblong to 

 elliptical, obtuse t9 acute, 9-18 lines long, very shortly petiolulate: pedun- 

 cles longer than the leaves, few-many-flowered; flowers sulphur-yellow, 6 

 lines long; calyx teeth ciliate or glabrous, the upper pair very short, tri- 

 angular, the other three subulate, nearly as long as the corolla : pods 



