328 PROCEEDINGS OF THE AMERICAN ACADEMY, 



& Trans. Linn. Soc. xxx. 428. — W. Texas, Wriglit, no. 161; New 

 Mexico, Wright, no. 1365. 



Var. Lindheimeri. Inconspicuously puberulent but with flowers 

 nearly or quite glabrous : mature leaflets 3 to 4 mm. long. — M. Lind- 

 heimeri, Gray, PI. Lindh. pt. 2, 181; Benth. 1. c. 429. — W. Texas, 

 Lindheimer. Mr. Pringle's no. 5152 from Michoacan is essentially the 

 same. 



* * * Herbs, underslirubs, or soft-woody often scandent shrubs, frequently seti- 



ferous or strigose. 

 -I- Corolla multistriate. 



57. M. somnians, H. & B. Undershrub, glabrous to densely 

 glandular-villous, armed with straight scattered usually infrequent spines : 

 pinnae 2 to oc pairs; leaflets 12 to 28 pairs, linear-oblong, 2 to 4 mm. 

 long: pods long-stiped, linear or narrowly oblong, acute, 8-11-seeded, 

 glabrous to glandular-pilose. — H. & B. in Willd. spec. iv. 1036 ; Kunth, 

 Mim. 20, t. 7 ; Benth. Trans. Linn. Soc. xxx. 434. M. pulpitans, H. & 

 B. 1. c. M. sonmiculosa, IIBK. Nov. Gen. & Spec. vi. 257. 31. acu- 

 tijiora & M. podocarpa, Benth. in Hook. Jour. Bot. iv. 397. — Widely 

 distributed in Ti'op. America, and reaching Central America and S. Mex- 

 ico : Oaxaca, Nelson, no. 2723 (smoothish form), no, 881 (glandular 

 form) ; Guatemala, Hayes, and no. 6104 of J. D. Smith's set; Panama, 

 Seemann, no. 105. 



58. M. trijuga, Benth. Unarmed undershrub ? pinnte 3 to 4 pairs : 

 leaflets 30 to 50 jjairs : pod glabrous. — Benth. in Hook. Jour. Bot, iv. 

 398, & Trans. Linn. Soc. xxx. 434. — Tropical America, extending to 

 Panama, Hayes, ace. to Benth. from whom the description is compiled. 



■I- -t- Corolla not striate: stems strongly angled, and angles armed with short 



recurved spines. 



■M- Canescent-tomentose to glabrous : leaflets obovate or elliptic : spines of the 



upper part of the stem and peduncles not especially numerous or conspicuous. 



59. M. malacophylla. Gray. Tomentose : stems 2 to 5 m. 

 long, climbing over shrubs: primary leaf-rhachis 1 to 1.5 dm. long; pin- 

 nae 3 to 6 pairs; leaflets 4 to 6 pairs; distinctly although obtusely pointed, 

 mucronate : pods more or less constricted between the seeds, 5 to 7.5 

 cm. long, 8 to 10 mm. broad, 5-8-jointed, smooth ; valves disarticulating 

 between the seeds. — PI. Lindh. pt. 2, 182, & PI. Wright, i. 52; Benth. 

 Tians. Linn. Soc. xxx. 423. — S. W, Texas, in the valley of the Rio 

 Grande, Wright, no. 164; Mexico, Nuevo Leon, Gregg, no. 207, Pringle, 

 no. 1905; Coahuila, Palmer^ no. 299 (coll. of 1880) ; Chihuahua, Bige- 

 loio, no. 319. 



