Acacia. | XLVII. § MIMOSEH (OLIVER). 349 
faintly longitudinally striate, pale yellowish grey, puberulous, narrowly 
subalate, few (5-10)-seeded, 2-83 in. long, about 4 in. broad.—A. 
Aucheri, Benth. Le. 499; A. pterygocarpa, Hochst., Benth. in Journ. 
Bot. 1846, 96. 
Nile Land. Abyssinia, Schimper! Nubia, Kotschy! Schweinfurth! 
The same plant occurs in Aucher-Eloy’s Oriental Herbarium (No. 4372) ; identified 
by Mr. Bentham with A. pterygocarpa. Dr. Schweinfnrth distinguishes two varieties : 
a. erythroa (=A, pterygocarpa) with fewer and laxer pinne and leaflets, sometimes 
curved spines and precocious flowers ; and 8. wthiopica (=A. nubica) with more nume- 
rous and denser pinne and leaflets, and always straight spines. 
26. A. robusta, Burch. ; Benth. in Hook. Journ. Bot, 1842, 501. A 
small much-branched tree; branches stout, terete, puberulous or gla- 
brous. Stipular spines straight, spreading, at length ivory-white, 
occasionally very short or obsolete. Leaf-rachis 1-24 in. long, glabrous 
or obsoletely puberulous, eglandular excepting frequently between the 
pinne occurs a small gland depressed in the centre; pinne in 2-3 
(1-5) pairs, leaflets 7-15-jugate, oblong or oval-oblong, more or less 
obtuse, coriaceous, 1—} in. long, 1-1} lines broad. Flowers yellow, 
capitate, on straight fascicled axillary peduncles, $-1 in. long, bearing 
the involucel below the middle. Calyx shortly and obtusely toothed. 
Petals united 2-3 their length, twice as long as the calyx. Legume 
(in Cape specimens) straight, linear-oblong, pointed, much narrowed 
below, flat, margins continuous; valves (immature) obscurely longi- 
tudinally furrowed, rugulose, glabrous, 14—2 in. long, $—3 in. broad. 
Lower Guinea. Huilla, Angola, Dr. Welwitsch! 
27. A. etbaica, Schweinf. Acacien-arten d. Nilgebiets, 330, t. 7, 8. 
Slender tree attaining 20-30 ft., extremities reddish-brown, early gla- 
brous. Stipular spines rather short, ascending, occasionally obsolete. 
Leaves glabrous, rigid; pinne in 3-6 pairs, with or without interposed 
glands; leaflets in 14—80 pairs, oblong obtuse, rather thick, closely 
and uniformly ranked, 1-14 lines long. Peduncles 3—5 in each axil, 
4 in. long more or less, puberulous, bearing the involucel about the 
middle. Heads rather few-flowered. ‘‘Calyx-teeth short, round, sub- 
ciliate. Petals united nearly to their ovate-acute apices, more than 
twice as long as the calyx.” Legume straight or but slightly curved, 
linear, compressed, but little narrowed to the obtuse apex ; valves con- 
tinuous, coriaceous, areolate-venose, glabrous, brown; 14-54 in. long, 
4 in. broad.—.A. awiphocarpa, Hochst. in Hb. Schimp. Abyss. No. 1057. 
org Land. Nubia, Soturba, Schweinfurth! Abyssinia, Schimper! Dillon and 
elit | 
Lower Guinea. Benguella, Dr. Welwitsch! (prickles very short, recurved). 
_. The name A. xiphocarpa 1 suppress, regarding the original plant of Hochstetter as 
identical with A. abyssinica. : 
The A. xiphocarpa of the Paris Herbarium and of Hb. Franqueville is A. etbaica, 
Schweinf. 
Dr. Welwitsch has a note that this plant is said to afford an excellent gum arabic. 
28. A. tristis, Welw. mss. Tree of 15-20 ft., covered with a grey 
tomentose-pubeseence. Stipular spines very short, conical, glabrous 
