72 LEGUMINOS^E. (PULSE FAMILY.) 



and glabrate, narrow. The 0. Lamberti of Torr. in Pacif . K. Rep. iv. 80. 

 On the Upper Canadian River, Colorado, Bigelow. 



15. HEDYSARUM, Tourn. 



Keel nearly straight, obliquely truncate, not appendaged, longer than the 

 wings. Pod flattened, the separable joints roundish and equal-sided. Peren- 

 nial herbs. 



1. H. Mackenzii, Richard. Stems 2 feet high, minutely pubescent, 

 simple or branched : leaflets 11 to 17 (usually 11), canescently pubescent, nearly 

 glabrous above : racemes loosely 1 to 30-flowered, elongating in fruit : flowers 

 large, light purple : pod 2 to 4-jointed, minutely pubescent. From Colorado 

 northward to the Arctic regions. 



2. H. boreale, Nutt. Leaflets 13 to 21, nearly glabrous: raceme of many 

 deflexed purple flowers : pod 3 orb-jointed, smooth, reticulated. From W. Wyo- 

 ming (Parry) northward throughout British America to the Arctic Circle. 



16. VI CIA, Tourn. VETCH. TARE. 



Wings adherent to the middle of the short keel. Style inflexed. Pod flat, 

 smooth. Seeds globular. Herbs, with angular stems, more or less climb- 

 ing : leaflets entire or toothed at the apex : stipules semi-sagittate : flowers 

 solitary or in loose peduncled axillary racemes. 



* Perennial: peduncles 4 to ^-flowered. 



1. V. Americana, Muhl. Usually rather stout, 1 to 4 feet high, gla- 

 brous : leaflets 4 to 8 pairs, very variable, linear to ovate-oblong, truncate to 

 acute : peduncles 4 to 8-flowered : flowers purplish : pod oblong, 3 to 6- 

 seeded. Throughout the whole of our range and extending to Washington 

 Territory and New Mexico and eastward across the continent. 



Var. truncata, Brewer. Usually somewhat pubescent : leaflets truncate 

 and often 3 to 5-toothed at the apex. Bot. Calif, i. 158. V. truncata, Nutt. 

 From Colorado and northwestward to Washington Territory. 



Var. linearis, Watson. Leaves all linear. Proc. Am. Acad. xi. 134. 

 Lathyrus linearis, Nutt. From the Rocky Mountains westward to California, 

 being the common western form of the species. 



# * Slender annuals : peduncles 1 or 2-Jlowered. 



2. V. exigua, Nutt. A span to two feet high, more or less pubescent: 

 leaflets about 4 pairs, linear, acute : peduncles rarely 2-flowered : flowers pur- 

 plish : pod linear-oblong. Torr. & Gray, Fl. i. 272. S. Colorado and New 

 Mexico, westward to California. 



3. V. micrantha, Nutt. Stem 2 to 3 feet long, strongly angled, gla- 

 brous, climbing : leaflets 2 to 6 pairs (usually 2 pairs), oblong-elliptical, obovate 

 or linear-oblong, obtuse or' ernarginate, mucronate : peduncles at first much 

 shorter than the leaves : flowers pale, blue at the tip : pod sabre-shaped, ses- 

 sile. Loc. cit. 271. From Colorado to Texas and Louisiana. 



17. LATHYRUS, L. EVERLASTING PEA. 



Nearly as in Vicia except the characters given in the synopsis of genera. 

 All of ours have long peduncles. Watson, Proc. Am. Acad. xi. 133. 



