eae 
ROBINSON. — SPECIES OF MIMOSA, 317 
Var. zygophylloides. Leaflets reduced to a single terminal pair 
on each. secondary rhachis, 4 to 6 mm. long, slightly rounder, thicker, 
and more veiny than in typical form.— Collected in flower at Man- 
zanillo, Colima, by Prof. M. EL. Jones, 25 June, 1892, no, 193 (herb. 
Nat. Mus.). The peculiar arrangement of the leaflets here 
corresponds to that in MW. Rosei, characterized below, but the leaflets 
themselves, even at full maturity, are not more than a third as large. 
24. M. Rosei. Unarmed, glabrous: branches striate: stipules subu- 
late; petiole and primary rhachis glandless, about 13 cm. long ; pinne 
4 pairs; secondary rhachises stipellate and geniculate near the base, 
12 to 14 mm. long; leaflets, mostly a single pair, rhombic-obovate, 
obtuse, glabrous, deep green above, not lucid, somewhat paler green 
beneath, 15 to 22 mm. long, two thirds as broad: spikes axillary, 
solitary, (including short peduncle) 6 cm. long in fruit: legume (scarcely 
mature) linear-oblong, acuminate, flat, thin with firmer margin, about 
8-jointed, 7 cm. long, 5 mm. broad; the segments sharply limited by 
straight transverse lines. — Collected in young fruit by Dr. J. NV. Rose, 
at Balafios, Jalisco, 10 to 19 September, 1897, no. 2919. 
= = = Fruit tomentulose but not setiferous. 
25. M. purpurascens. Habit, thorns, &c., much as in Jf. laxi- 
S 
flora: pinne 4 to 5 pairs; leaflets about 4 pairs, 4 to 6 mm. long, 
puberulent (under lens) below; rhachises puberulent: spikes solitary or 
geminate, 4 cm. long including short peduncle; flowers subsessile, dis- 
tinctly purplish: calyx finely pubescent: pods about 5-seeded, oblong, 
acute, 3.5 cm. long. — M. laxiflora, Brandegee, 1. ¢., at least in part, 
not Benth. — Lower Calif., at La Paz, Brandegee, 4 February, 1890, 
no. 185, in flower, and at Purisima, 13 February, 1889, in fruit, secu 
by same collector. Some old fruit collected by Xantus in 1873, appears 
to be of the same species. Type in herb. Brandegee. Although near 
- laxiflora, this plant cannot be satisfactorily referred to it. 
“+ Leaflets 4 to 15 (rarely 20) pairs, linear to elliptic-oblong, mostly more 
than twice as long as broad: fruit not exceeding 1 cm. in breadth: shrubs, 
mostly armed. 
++ Pods thin, sometimes setose but not tomentose; segments much broader 
than long. 
26. M. polyantha, Bentn. Shrub 1 to 2 m. high: spines stout, 
recurved, solitary beneath the axils: leaves not fully developed at time 
of flowering: pinne 2 to 3 pairs; leaflets 4 to 8 pairs, oblong, small, 
glabrous. above, sparingly appressed-pubescent or glabrous beneath, about 
5 mm. long: spikes numerous, 4 or more fascicled at each node of the 
