; 
} 
ROBINSON. —SPECIES OF MIMOSA, 3819 
Guadalajara, Jalisco, Palmer, no. _449 (coll. of 1886) in fruit, Pringle, 
nos. 2914, 4459, in flower; near Tamazulapam, Oaxaca, Nelson, 
no. 1962. 
Var. malacocarpa. Fruit fulvous-tomentose but nearly or quite 
devoid of prickles. — Collected by #. W. Nelson, between Amolac, 
Puebla, and Sochi, Guerrero, altitude 1200 to 1260 m., 28 November, 
e no. 2023, and by J. WV. Rose, at Bolafios, Jalisco, September, 1897, 
- 2917. Indistinguishable from the typical form except by its strik- 
cals different fruit. The original specimens of Acacia fusciculata 
described by Kunth were not in fruit, so it is impossible to say which 
form was the original one. Under the circumstances it seems best to 
adopt as the typical form the one of which the fruit was first described 
(see Wats. 1. ¢.). 
6. Calyx more ae peach 1 to 1.5 mm. long, a oR to half the length 
of t rolla: spikes shorter and thic 
1. Spines eae dark-colored, not greatly pee: 
29. M. ccelocarpa. Shrub, armed with small scattered straight 
Spines; bark of branches gray: pinne 6 to 8 pairs; leaflets oblong, acut- 
ish, green on both sides, appressed-puberulent upon margin and lower 
surface, 3 mm. long, eccentrically 1-nerved, thin ; stipules setaceous : spikes 
mostly geminate in the upper axils, moderately loose ; peduncles slender, 
14 to 18 mm. long: buds obovoid: flowers white with roseate tinge: 
Corolla 4-parted: stamens 1 em. in length: pods oblong-linear, acute at 
both ends, unarmed, tomentulose, 4 or 5 em. long, 5 mm. broad; margins 
thickened ; segments distinctly concavo-convex, the seed more or less 
prominent within the concavity. — Collected at Topolobampo, Sinaloa, 
Mexico, by Dr. Edward Palmer, 15 to 25 September, 1897, no. 187. 
Near the next, but distinguished by its peculiar fruit, longer peduncles, 
looser spikes and thinner leaflets. Types in herb. Gray and herb. U. S. 
at. Mus 
Wrightii, Gray. Shrub, armed with scattered spines: 
SOs M. 
branchlets tomentulose, angulate; leaves much asin the last but thicker, 
varying from tomentose to subglabrous : peduncles shorter, 1 to 1.5 cm. 
long: spikes short and at first very dense; buds subglobose, tomentose : 
pods rusty-tomentose, unarmed; margins thick; segments not distinctly 
concavo-convex. — PI. Wright. ii. 52; Benth. Trans. Linn. Soc. xxx. 
417. — Mountains of Arizona, Palmer, Pringle, Toumey, nos. 37, 383 
Sonora, Wright, no. 1041 (type); Chihuahua, Pringle, no. 359, Hart-» 
man, no. 782. A greener and usually less tomentose plant than the 
next species. 
