ROBINSON. — SPECIES OF MIMOSA. 3821 
+ + + + Leaflets 15 to 40 pairs: fruit over 1.5 cm. broad: armed shrub, not 
glandular. 
34. M. platycarpa, Bent. Thorns scattered, recurved: pinne 6 
to 10 pairs; leaflets 15 to 25 pairs, linear, 2 to 3 mm. long: spikes slen- 
der, loosely flowered: fruit stiped, flat, glabrous, nearly 4 em. in length. 
— Trans. Linn. Soc. xxx. 417. — Guatemala, Skinner (acc. to Benth.) 
Description compiled. 
+ + + + Leaflets 22 to 40 pairs, linear-oblong: stem arborescent; branches 
armed, glandular-pubescent. 
35. M. Cabrera, Karst. Small tree armed with scattered straight 
spines: pinne 5 to 8 pairs; leaflets 18 to 35 pairs, 5 mm. long, concolor- 
ous, pubescent upon both sides: flowers somewhat verticillate in long 
flexuous interrupted spikes: legume flat, pubescent. — Fl. Colomb. ii. 63, 
t. 132; Benth. Trans. Linn. Soc. xxx. 416. ? IM. tenuiflora, Poir. 
Suppl. i. 82, not Benth. ? Acacia tenuiflora, Willd. Spec. iv. 1088. — 
? San Salvador, Wendland (ace. to Benth. & Hemsl.); Valley of Com- 
ayagua, Honduras, Miederlein. Northern S. America. If Bentham is 
right in stating that this species is the same as Acacia tenuiflora, Willd., 
there seems no reason why Poiret’s Mimosa tenuiflora should not be 
taken up for it upon grounds of priority, but on a comparison of an 
authentic specimen of M. Cabrera, with Willdenow’s original description 
there appear to be several striking differences rendering real identity 
m™possible. M. Cabrera is called by the Spanish Americans “carbon ” 
or “carbonal” and its wood is, acc. to Niederlein, used to make char- 
Coal, y 
* * Flowers in globose, ovoid or (in JM. monancistra) subcylindric heads. 
~ Shrubs or trees with hard wood, rarely (in Mf. Lemmoni and M. Grahami) only 
undershrubs: branchlets mostly armed with Scattered or infra-stipular never 
Seriate spines : pubescence never strigose: corolla not striate. 
++ Pubescence not rufous: pods setose or spinose upon the valves. 
= Pod oblong or moniliform, not over 1 cm. broad. 
oe 30, - monancistra, Benra. Low shrub with flexuous grayish 
often striate branchlets: internodes armed by a single short recurved 
subaxillary spine (which is frequently some distance beneath the leaf 
Insertion) : pinne 2 to 3 pairs ; leaflets mostly 4 pairs, oblong or ellipti- 
cal, obtuse, 3 to 6 mm. long, appressed-pubescent: heads ovoid or short- 
cylindric; flowers silky-tomentulose: pods 3 to 5 cm. long, acuminate, 
3-7-jointed hispid with stramineous sete or weak spines. — Pl. Hartw. 12, 
& Trans. Linn. Soc. xxx. 425: Wats. Proc. Am. Acad. xvii. 350.— W. 
Texas, on the Rio Pecos, Havard, no. 66; Mexico, Tamaulipas, Berlan- 
VOL- XXXIII. — 2], , 
