102 BOTANY. 



caducous: pods shortly Btipitate, 5-7-jointed ; joints triangular-rounded, 

 nearly smooth and glabrous, l£ to 2£ lines long. — Southeastern Arizona, 

 previously collected only by Mr. Wright in the valley of the San Pedro ; 

 at Rocky Canon, Camp Grant, and Chiricahua Agency, Rothrock (290, 

 366, 531). It seems to differ only in its smoother pods from D. Sonorae, 

 Gray, I. c, which is referred by Bentham to D. uncinatum, DC, of Mexico 

 and southward. The latter has usually much larger, conspicuous bracts, 

 broader leaves, and more densely tenacious-pubescent pods. 



Vicia Americana, Muhl., var. linearis, Watson (Proc. Am. Acad, 

 xi, 134). {Lathyrus linearis, Nutt.) — Leaflets linear. — A very common 

 western form ; San Francisco Mountains, 1872, and at Willow Spring, 

 Ariz., Rothrock (224 in part), also at Denver, Colo., Wolf (185). Speci- 

 mens of nearly the typical form were collected near Denver, Wolf (186), 

 and in Nevada and Utah, 1871 and 1872. 



Vicia pulciiella, H. B. K. (Nov. Gen. vi, 499, t. 583).— Tall and 

 very slender, sparingly silky-pubescent: leaflets linear, obtuse or acute, 

 mucronate, a half to an inch long; stipules narrow: flowers small, numer- 

 ous) usually crowded in long-peduncled racemes, equalling the leaves, pale 

 purple or ochroleucous, 2 or 3 lines long, reflexed : pods linear-oblong, an 

 inch long, nearly sessile, puberulent, 6-8-seeded. — From Western Texas to 

 Arizona and southward ; Mount Graham, and Willow Spring, Ariz., Roth- 

 rock (211, 434, 1006, 1009). 



Lathyrus paluster, Linn. — The prevalent form has the leaves very 

 narrowly linear. — Collected in Utah in 1872, at Clear Creek, Colo., Wolf 

 (187), at Big Dry Fork, Ariz., Loew (204), at Rocky Canon and Willow 

 Spring, Ariz., Rothrock (286, 224 in part), and also at Fort AVingate, N. 

 Mex., Rothrock (142). — The broader-leaved var. myrtifolius, Gray, appears 

 to have been collected in the Wahsatch in 1872, referred in the published 

 list to L. venosus. 



Lathyrus polymorphic, Nutt. (Gen. ii, 96). — Perennial, erect, a foot 

 or two high, stout and scarcely climbing, finely pubescent or glabrous, 

 glaucous: leaflets 3 to 6 pairs, thick and strongly nerved, narrowly oblong, 

 acute at each end, an inch or two long; stipules narrow, acuminate: 

 peduncles equalling the leaves, 2-6-flowered : flowers purple, very large, 9 



