224 LEGUMINOSAE. 



Herbage densely silky -villous; tendrils none. L. littoralis. 



Herbage glabrous or if pubescent not villous. 



Plants erect; tendril wanting or much reduced. 



Flowers solitary, rarely 2. L. torreyi. 



Flowers 5—7 to each raceme. . L. nuttallii. 



Plants climbing by simple or 3-forked tendrils. 



Stems wing-margined. L. paluster. 



Stems wingless. 



Stipules narrow, semi-sagittate; leaves coriaceous. 



Leaflets cuspidate, glabrous. L. pauciflorus. 



Leaflets not cuspidate, pubescent. L. coriaceus. 



Stipules large, broad, semi-hastate; leaves mem- 

 branaceous. 

 Flowers yellowish, becoming ochraceous. L. sulphureus. 



Flowers blue-purple. 



Leaflets thin, 5-8 pairs. L. polyphyllus. 



Leaflets thickish, 3—5 pairs. L. maritimus. 



Lathyrus littoralis (Nutt.) Endl. Herbage densely silky -villous; stems 

 terete, weak and decumbent, 15-60 cm. long; leaflets 1—3 pairs, the lateral ones 

 oblong, cuneate at base, 10-12 mm. long, the terminal one linear and much 

 smaller; stipules entire, longer than the leaflets; tendrils none; peduncles 

 2-7-flowered; calyx-teeth subequal, lanceolate, acute, as long as the tube; 

 corolla violet-purple; pods villous, 3-4 cm. long. 



Common along the ocean coast; first collected and described by Nuttatt 

 from the mouth of the Columbia River. 



Lathyrus torreyi Gray. Herbage sparsely villous; stems terete, erect, 

 15-40 cm. high; leaflets 4-7 pairs, oblong or ovate, mucronate, 5-12 mm. long, 

 the terminal one often wanting; stipules semi-sagittate, narrow, entire, acumi- 

 nate; peduncles 1-flowered or rarely 2-flowered, much shorter than the leaves; 

 calyx-teeth subulate, the three lower ones longer than the tube; corolla 15 mm. 

 long; standard bluish-purple, the other petals whitish; pods narrow, pubescent. 



In open woods, Washington to northern California, rather local. 



Lathyrus nuttallii Wats. Somewhat pubescent; stems slender, angled, 

 30-90 cm. high, ascending or erect; tendrils oblong to ovate, thin, cuspidate, 

 pubescent beneath; stipules semi-sagittate; peduncles 5-7-flowered, about as 

 long as the leaves; calyx pubescent, its teeth unequal, the lower one longest; 

 corolla purple, 12-15 mm. long; pods glabrous. 



In open woods, rather scarce. 



Lathyrus paluster L. Glabrous or nearly so; stems slender, wing-margined, 

 erect or ascending, 30-90 cm. high; tendrils well developed; leaflets 2^t pairs, 

 linear to narrowly oblong, firm, acute, 2-4 cm. long; stipules sagittate, narrow, 

 acuminate; peduncles 3-6-flowered ; calyx- teeth unequal, the longer lower ones 

 about as long as the tube; corolla purple, 2-2.5 cm. long; pods glabrous, 5 

 cm. long. 



In marshes near the seashore, not common. 



Lathyrus pauciflorus Fernald. Glabrous throughout, 60-90 cm. high; 

 stems angled; leaflets 3-6 pairs, oblong-elliptic, thickish, prominently veined, 

 paler beneath, acute and cuspidate, rounded at base, 2-4 cm. long; stipules 

 about half as long as the adjacent leaflets; tendrils simple or branched; pe- 

 duncles exceeding the leaves, 3-5-flowered ; flowers violet, about 2 cm. long; 

 calyx-teeth slightly pubescent, about as long as the tube; pods smooth, 4-6 

 cm. long. 



Rare in our limits; Nisqually Valley, Washington, Allen; Vancouver Island, 

 British Columbia, Macoun. 



