820 PROCEEDINGS OF THE AMERICAN ACADEMY. 
2. Spines light-colored, conspicuously compressed and very broad at the base. 
he 31. M. dysocarpa, Bentu. Shrub with stems angled: pinne 6 to 
12 pairs; rhachis elongated, slightly armed with small scattered spines ; 
leaflets 7 to 16 pairs, densely silky-villous almost tomentose, somewhat 
cinereous, oblong, 4 to 6 (to 8) mm. in length, acutish: spikes at first 
dense, at length laxer, 2.5 to 7.5 em. long exclusive of the much shorter 
peduncle, subpaniculately aggregated at the summit of the stem: calyx 
and pods tomentose, the former 2 mm. or more in length, turbinate below; 
the latter 2.5 to 5 cm. long, about 6-seeded, more or less constricted 
between the seeds, sharply acuminate, unarmed or provided with a few 
short curved spines on one edge. — Benth. in Gray, Pl. Wright. i. 62, & 
Trans. Linn. Soc. xxx. 414, t. 66; Gray, Pl. Wright. ii. 51; Coult. 
Contrib. U. S. Nat. Herb. ii. 97. — Rocky hills, W. Texas, Wright, no. 
_163; New Mexico, Thurber, no. 1104, Wright, no. 1040; Miss Mul- 
_ ford, nos. 387, 696; Arizona, Rothrock, no. 511, Rusby, no._113a, 
Lemmon, no. 2690; State of Durango, Mexico, Palmer, no. 418 (coll. 
of 1896). 
= = Stem covered with minute sessile or stipitate glands. 
32. M. adenantheroides, Bentu. Stem puberulent, glandular- 
punctate: spines recurved: pinne about 9 pairs; leaflets about 9 pairs, 
obliquely oval, obtuse, 3-nerved, pubescent, pale beneath: spikes fascicled 
by 3’s; flowers pubescent. — Benth, in Hook. Lond. Jour, Bot. v. 885 
& Trans. Linn, Soc. xxx. 416. Acacia adenantheroides, Mart. & Gal. 
Bull. Acad. Brux. x. pt. 2, 310. — On calcareous and gneissic mountains 
of Sola and Yolotepeque, Cordillera of Oaxaca, at 2153 to 2307 Ms 
Galeotti, no. 3208. Description compiled. Near this species must 
stand two differing yet doubtfully distinct plants collected in the moun 
tains of Oaxaca by Nelson, and represented by his nos. 2078 and 1479. 
Both differ from the above description in having only 3 to 5 pairs of 
pinne, but without fuller knowledge of Bentham’s species can neither 
be identified with it nor positively excluded from it. 
« + + Leaflets 15 to 40 pairs, oblong: fruit not 1 cm. in breadth: unarmed tree. 
83. M. puberula, Benru. Pinne 5 to 10 pairs; leaflets 15 to 40 
pairs, crowded, oblong, rigid, obtuse, 4 to 5 mm. long: spikes axillary, 4 
to 5 cm. long: fruit stipitate, flat, pubescent. — Benth. in Hook. Lon 
Jour. Bot. v. 88, & Trans. Linn. Soc. xxx. 413. — Zimapan, ah 
Coulter, and “ New Spain” Herb. Pavon, ace. to Benth. Description 
compiled. © 
