330 PROCEEDINGS OF THE AMERICAN ACADEMY, 
brachycarpa, Benth. in Hook Jour. Bot. ii. 180, iv. 415. — Tropical 
America: S. Mexico, Huasteca, Hrvendberg; Guatemala, nos. 211 & 
6105 of J. D. Smith’s sets. 
A noteworthy form, coll. at Mazatlan, Sinaloa, Lamb, No. 329 
(distrib. as Mf. Ervendbergit) has straighter spines and longer less pubes- 
cent unarmed peduncles. 
ee pe not striate: pubescence not strigose: spines scattered, not seri- 
: pods short, 1-3-jointed, narrow, not over 5 mm. in breadth. 
++ Densely villous with long ccrehing yellowish hairs. 
638. M. camporum, Bent. Prostrate, nearly herbaceous, scarcely 
armed: stipules ovate, striate: pinnz about 6 pairs; leaflets numerous, 
narrowly oblong: heads large, many-flowered, oval, including the long 
Stamens 2.5 cm. in diameter; bracts long and conspicuous in the young 
heads, imbricated, ciliate, tawny-villous: pods 6 to 12 mm. long, 4 mm. 
broad. — Benth. in Hook. Jour. Bot. ii. 130, iv. 403, IM. flaviseta, Benth. 
in Hook. Lond. Jour. Bot. v. 90. JL eschynomenes, Benth. Bot. Sulph. 
89.— Acaponeta, Tepic, Rose, nos. 3116, 3295; Realejo, Nicaragua, 
Hinds, Sinclair, acc. to Hemsl. (Trop. Am.) 
++ ++ Hispid with a few scattered setose spines, and sparingly pubescent. 
tL 64. M. pusilla, Benrn. Prostrate annual: pinne 1 to 9 pails, 
leaflets 6 to 12 pairs, oblong, 4 mm. long, heads small, few-flowered, 6 
mm. in diameter; peduncles 1 cm. or less in length: pods 2-3-jointed, 
setulose on margin or valves, 3 or 4 mm. in breadth. — Bot. Sulph. 99.— 
Acapulco, Pulmer, no. 9 (coll. of 1894-1895); Realejo, Sinclair, Hinds, 
ace. to Benth. & Hemsl. Although I have seen no authentic specimens 
of this species, I cannot doubt that it is represented by Dr. Palmer's 
specimen. 
+ + + + Corolla not striate: pubescence usually strigose: pods 1-«-seeded, 8 
to 14 mm. broad. 
++ Prostrate, herbaceous or nearly so: leaf-rhachis unarmed : pods 2-4-seeded. 
65. M. strigillosa, Torr & Gray. Often rooting at the joints, 
3 scarcely or not at all armed: heads large, oval, usually long-peduncled : pods 
2.5 om. in length, oblique at the summit, acutish, setose throughout. — Fi. 
i. 399; Chapm. Fl. 115. — Pine barrens and hummock lands of Florida, 
__- westward to W. Texas: adjacent Mexico, Berlaudier, Gregg, Palmer. 
é ++ ++ Ascending or erect, suffruticose : leaf-rhachis armed with opposite aciculat 
spines between the pinne; stipels also spinescent: pods short 1-3-seeded, 
obovate with broad oblique summit. 
66. M. dormiens, H. & B. Whole habit and foliage of the fol- 
_ lowing more abundant species, but softer appressed-villous rather than 
