526 FABACEAE 



1. V. cracca L. Stem weak, 3-12 dm. high; stipules narrowly semi-sagit- 

 tate, entire; leaflets 18-24, thin, linear or linear-oblong, mucronate, 1.5-2 cm. 

 long, finely pubescent; corolla bluish purple, 11-13 mm. long; pod 1.8-2.5 cm. 

 long. Dry soil: Newf. — N.J. — Kans. — Ida. — B.C.; nat. from Eu. Je-Au. 



2. V. trifida Dictr. Stem low, 1-4 dm. high, more or less pubescent when 

 young; stipules broadly semi-sagittate, often toothed; leaflets 8-12, linear or 

 narrowly oblong, acute at both ends or truncate at the apex, mucronate or cuspi- 

 date, dark green; racemes 3-6-flowered ; corolla bluish purple, 15-18 mm. 

 long; pod 2 cm. long, puberulent or glabrate. V. tridentata Schwein. V. caespi- 

 tosa A. Nels., a depauperate form. V. callianlhema Greene. Wet meadows: 

 w Ont.— Kans.— Tex. — Nev.— B.C. Plain— Mont. My-Au. 



3. V. oregana Nutt. Stem 3-8 dm. high, somewhat pubescent when young, 

 or glabrate, angled; stipules usually narrowly semi-sagittate, mostly toothed; 

 leaflets 8-12, elliptic or those of the lower leaves linear, often truncate and some- 

 what toothed at the apex, 1-2.5 cm. long, dark green, appressed-pubescent, at 

 least below; raceme 3-8-fiowered ; corolla pink-purple or bluish purple, 15-20 

 mm. long; pod about 3 cm. long. V. vexillaris Greene. Meadows: Sask. — 

 N.M.— Calif.— B.C. Plain— Mont. My-Au. 



4. V. sparsifolia Nutt. Stem low, 2-5 dm. high, glabrous; leaflets 8-12, 

 narrowly linear, firm, strongly veined, acute at both ends, mucronate, glabrous 

 or nearly so, 2-4 cm. long, 1-3 mm. wide; raceme 2-6-flowered; corolla bluish 

 purple, about 18 mm. long; pod 3 cm. long, 6-7 mm. broad. V. linearis (Nutt) 

 Greene. Prairies and plains : Man. — Okla. — N.M. — Calif. — B.C. Plain — Mont. 

 My-Au. 



5. V. dissitifolia (Nutt.) Rydb. Stem tall, slender, 3-7 dm. high, gla- 

 brous; leaflets 8-12, linear or narrowly oblong, 1.5-5 cm. long, 2-5 mm. wide, 

 rather thin, not strongly veined, acute at both ends, mucronate; raceme 3-6- 

 flowered; corolla violet-purple, 15-18 mm. long. Lathyrus dissitifolius Nutt. 

 Confused with and grading into V. oregana. Valleys: w Neb. — Colo. — Utah. 

 Plain — Mont. Je-Au. 



6. V. americana Muhl. Stem glabrous or nearly so, 3-10 dm. high; leaf- 

 lets 8-12, oval or elliptic, or those of the lower leaves linear-oblong, thin, gla- 

 brous, usually rounded at both ends or retuse at the apex, mucronate, 1.5-3.5 

 cm. long, not strongly veined; racemes shorter than the leaves, 3-9-fiowered ; 

 corolla bluish purple, 15-20 mm. long; poa glabrous, 2.5-3 cm. long. Meadows: 

 N.B.—Va.— Ariz.— B.C. Plain— Mont. My-Au. 



7. V. pumila Heller. Stem low, 2-4 dm. high, ascending, sparingly pubes- 

 cent; leaflets 6-14, 10-15 mm. long, 4^6 mm. wide, truncate, cuspidate, and 

 sometimes toothed at the apex, appressed-pubescent on both sides, prominently 

 veined ; racemes 3-6-flowered ; corolla violet-purple, 15-18 mm. long. V. calif ornica 

 Rydb., not Greene. Valleys and river banks: Colo. — Calif. — B.C. Subtnont. 

 Je-Au. 



8. V. angustifolia (L.) Reichard. Annual; stem glabrous, 3-5 dm. high; 

 leaflets 5-11, those of the lower leaves oblong, truncate, those of the upper 

 linear, mucronate, 1.5-3 cm. long; corolla purple or rose-colored; pod 4-5.5 cm. 

 long, 5-7 mm. wide. Fields, meadows, and waste places: Ida.; also in the East; 

 nat. from Eu. 



9. V. producta R;''db. Stems slender, decimibent or ascending, 2-3 dm. 

 liigh; stipules narrow, semi-hastate, entire; leaflets 7-11, oblong to linear, 5-15 

 mm. long, obtuse, mucronate; peduncles 2-4 cm. long, produced beyond the 

 upper flowers; corolla yellowish white, tipped and tinged with purple. V. 

 Thurberi S. Wats., in part. Among bushes: Colo. — N.M. — Ariz. — Utah. Sub- 

 mont. My-Je. 



43. LATHYRUS (Tourn.) L. Vetchling. 



Herbaceous vines, rarely erect herbs, mostly perennials, with horizontal 

 rootstocks. Leaves alternate, abruptly pinnate, the rachis usually tendril- 

 bearing at the apex, or the tendril represented by a tip or an appendage. Flowers 



