328 PROCEEDINGS OF THE AMERICAN ACADEMY. 
& Trans. Linn. Soc. xxx. 428.— W. Texas, Wright, 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, P]. Lindh. pt. 2, 181; Benth. L c. 429.— W. Texas, 
Lindheimer. Mr. Pringle’s no. 5152 from Michoacan is essentially the 
same. 
* * * Herbs, undershrubs, or soft-woody often scandent shrubs, frequently seti- 
ous or strigose. 
+ Corolla multistriate. 
57. M. somnians, H. & B. Undershrub, glabrous to densely 
glandular-villous, armed with straight scattered usually infrequent spines : 
pinne 2 to « 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. ML palpitans, H. & 
B.1.c. MM. somniculosa, HBK. Noy. Gen. & Spec. vi. 257. MM. acu- 
tiflora & M. podocarpa, Benth. in Hook. Jour. Bot. iv. 397. — Widely 
distributed in Trop. 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, Benru. Unarmed undershrub? pinne 3 to 4 pairs: 
leaflets 30 to 50 pairs: pod glabrous. — Benth. in Hook. Jour. Bot. 1v. 
398, & Trans. Linn. Soc. xxx. 434. — Tropical America, extending to 
Panama, Hayes, acc. to Benth. from whom the description is compiled. 
+ + Corolla not striate: stems strongly angled, and angles armed with short 
recurved spines. 
++ 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 9 = 
long, climbing over shrubs: primary leaf-rhachis 1 to 1.5 dm. long; pip- 
nz 3 to 6 pairs; leaflets 4 to 6 pairs; distinctly although obtusely pointed, 
mucronate: pods more or less constricted between the seeds, 5 to ‘2 
em. long, 8 to 10 mm. broad, 5—8-jointed, smooth; valves disarticulating 
between the seeds. — Pl. Lindh. pt. 2, 182, & Pl. Wright. i. 52; Benth. 
_ Trans. Linn. Soc. xxx. 423. —S. W. Texas, in the valley of the Rio 
S Grande, Wright, no. 164; Mexico, Nuevo Leon, Gregg, no. 207, Pringle, 
no. 1905; Coahuila, Palmer, no. 299 (coll. of 1880) ; Chihuahua, Big 
Tow, no. 319. ; 
