PEA FAMILY 147 



Corolla 12-15 mm. long; bracts linear-subulate, 5 mm. or more long. 

 Leaflets oblong, elliptic, or oval, less than 3 cm. long. 3. H. borealc 

 Leaflets lanceolate, fully 3 cm. long. • 4. i/. lancifolium. 



Corolla 15-20 mm. long; bracts lanceolate, 2-4 mm. long. 5. H. marginatum. 

 Calj'x-teeth subulate, longer than the tube; reticulations of the pods transversely elon- 

 gate, usually reaching from the middle to the margins, without cross-veins. 

 Flowers 15-20 mm. long. 



Calyx sparingly strigose; loraents with 4-7 internodes; nodes more than half as 



wide as the internodes. 6. H. Mackenzii. 



Calyx canescent; loments with 2-5 internodes; nodes less than half as broad as 

 the internodes. 7. H. lUahense. 



Flowers 10-15 mm. long. 



Leaves glabrous above, at least in age. 



Leaflets elliptic-oblong, not fleshy; flowers 12-15 mm. long, purple; bracts 

 lanceolate-subulate, 3-5 mm. long; internodes of the loments 3-5. 



8. H. pabulare. 

 Leaflets linear-oblong, somewhat fleshy; flowers about 10 mm. long, rose- 

 purple; bracts lanceolate, 1.5-2 mm. long; internodes of the fruit 1-3. 



9. H. carnosulum. 

 Leaves canescent on both sides. 10. H. cinerascens. 



40. ONOBRYCHIS Scop. Sand-foin. l. O. Onobrychis. 



41. MEIBOMIA Heister. Tick-trefoil, Beggar's Ticks. 



Leaflets neither coriaceous nor strongly reticulate beneath. 1. M. canadensis. 



Leaflets coriaceous, strongly reticulate beneath. 2. M. illinoensis. 



42. ViCIA L. Vetch, Wild Pea. 



Racemes 3— 40-flowered ; flowers 1-2.5 cm. long. 



Racemes one-sided, dense, 15-40-flowered. 1. V. cracca. 



Racemes lax, 3-10-flowered. 



Leaflets linear to oblong; stipules usually narrow, semi-sagittate and often entire. 

 Leaves decidedly pubescent, rather thick and strongly veined. 



Stem low; leaflets linear to oblong. 2. V. trifida. 



Stem tall; leaflets oblong or elliptic, only those of the lower leaves some- 

 times linear. 3. V. orepana. 

 Leaves glabrous or slightly pubescent when young. 



Leaflets elongate, narrowly linear; plant low and erect. 4. V. sparsifolia. 

 Leaflets, at least the upper ones, oblong or linear-oblong; plant tall and 

 climbing. 5. V. dissitifolia. 



Leaflets broad; stipules broadly semi-sagittate or semi-orbicular in outline, 

 sharply toothed. 

 Leaflets usually oval, thin and not strongly veined, mostly entire and acute 



or rounded at tlie apex. , 6. V. americana 



Leaflets obovate-cuneate, firmer and more strongly veined, truncate and 

 toothed at the apex. 7. V. pumila. 



Racemes 1-2-flowered. 



Flowers 1-1.8 cm. long, subsessile in the axils; annual. 8. V. anrjuslifoUa. 



Flowers 6-8 mm. long, on a distinct peduncle; perennial. 9. V. producla. 



43. LATHYRUS (Tourn.) L. Vetchling. 



Corolla purple. 



Stem winged; leaflets Linear, lanceolate, or oblong; flowers about 15 mm. long. 



1. L. palustris. 

 Stem wingless. 



Racemes 1-flowered. 11. L. Torreyi. 



Racemes several- to many-flowered. 



Tendrils much reduced; stem mostly erect. 



Leaflets 1 or 2 pairs; flowers 8-10 mm. long. 



Leaflets narrowly linear. 2. L. Sandbergi. 



Leaflets oval or oblong. 3. L. bijugatus. 



Leaflets 3 or 6 pairs; flowers 20—25 mm. long. 



Plant glabrous or nearly so. 4. L. ornatus. 



Plant decidedly villous-pubescent. 5. L. incanus. 



Tendrils usually well developed; plant more or less climbing. 

 Corolla less than 18 mm. long. 



Leaflets linear to oblong-elliptic, tliick, veiny. 



Leaflets oblong-elliptic. 6. L. coreaceus. 



Leaflets linear. 7. L. graminifolius. 



Leaflets broadly oval or ovate. 



Tendrils u.sually 3-cleft; leaflets moderately firm, strongly veined. 

 Stipules large, often half as long as the small, 1-3 cm. long leaf- 

 lets. 8. L. Schaffneri. 

 Stipules very small in comp.irison with the large 2-7 cm. long 

 leaflets. 9. L. venosus. 

 Tendrils simple; leaflets not strongly veined. 10. L. NuUallii. 

 Corolla 2 cm. long or more. 



Stipules large and broad, about half as long as the leaflets. 

 Leaflets not linear. 



Leaflets rounded-oval, obtuse or rounded and munronate at 

 th3 ap3v. 12. L. utahensis. 



