Acacia. | XLVII. § MIMOSEH (OLIVER), 339 
Involucel between the extremities of peduncle. 
Legume straight or nearly so. (Compare A. Adansonii, 
p. 353, and A, verugera, p. 354.) 
Legume continuous (margins parallel). 
Pinne 2-12 pairs. Legume 1-3 in. long. 
Leaflets 6-15-jugate, 2-3 lines long; legume 
margin subalate, puberulous, grey. . . . . 25. A. nubica. 
Leaflets 6-15jugate, 3-4 lines long; legume 
margin notalateé . . . 0. we kt se 265 A ee 
Leaflets 14-30-jugate, 1-14 lines long; legume 
Slabeous, broad 0 02 Gr es es Fh 
Pinne 10-30 pairs, Legume 5-6in. long . . . 21. A. Sieberiana. 
Pinne 6-11 pairs. Legume 4-6 in. long, pubescent 28. A. tristis. 
Legume constricted between the seeds. 
Valves not'tubercled =. oink ea te 8 BR Ai 
Valves tubercled .. 5. : 4...) 55 80 A ae 
Legume falcate, not twisted, not exceeding } in. broad. 
Pinne in 3-10 pairs. 
Legume broadly constricted, §-} in. broad . . . 31. A. Seyal. 
Legume scarcely or not constricted, in. broad . 32. A. stenocarpa. 
Pinne in 1-2 pairs. Legume broadly constricted . 33. A. Hhrenbergiana, 
Legume spirally twisted. 
Legume puberulous or pubescent . . . . . . . 34. A. spirocarpa. 
Legume glabrous... 8 SS en oe i al 
1. A. albida, Delile, Fl. Ayypt. 142, t. 52,3, A large tree, much 
divaricately branched, with whitish or pale grey bark; extremities 
wholly glabrous or puberulous. Stipular spines straight, spreading, 
rather stout at base, usually not exceeding 3—}in., frequently much 
shorter or rudimentary. Leaves glabrous or puberulous ; rachis usually 
from 4-3 in. in length with a sessile gland between each of 4-6 (2-8) 
pairs of pinne ; leaflets oblong, mucronulate, the midrib very oblique, 
in 7~17 pairs, 14-3 (4) lines long. Spikes axillary, solitary or gemi- 
nate, with peduncle 23-5 (7) in. long. Flowers sessile, “ white, 
glabrous (or pubescent in A. saccharata). Calyx short, cupuliform, 
broadly toothed, glabrous or puberulous. Petals free nearly from the 
base, 4 times longer than calyx. Legume flat, oblong, arcuate, often 
sinuous on the outer suture, valves coriaceous, often transversely 
nerved and reticulate or at length smooth, 2-4 or 5 in. long, $-1 (14) 
in. broad, on a very short stipes.—A. saccharata, Benth. in Lond, Journ. 
Bot. 1842, 505; A. gyrocarpa, Hochst. in Schimp. Pl. Abyss. 
Upper Guinea. Senegambia, Robert! Lelieur! A pubescent unarmed form’ 
(A. saccharata, Bth.), Heudelot ! : : 
Nile Land. Abyssinia, Schimper! Capt. Pullen? Nubia, Petherick! and 
others. Upper Nile, Speke and Grant! Schweinfurth. 
Lower Guinea. Mossamedes, Dr. Welwitsch! A noble form, pubescent both ex- 
tremities and leaves, the racemes with peduncle 6-7 in. long, and the straight or arcuate 
flat legumes rather over 1 in. broad. 
Mozamb. Distr. Zambesi, Dr. Kirk! ‘ ; . 
To this species I would also refer with doubt, A. mossambicensis, Bolle in Peters 
Mossamb. Bot. i. 5. I do not observe any character in the published description by 
which it differs, excepting in the absence of spines. This, however, occurs occasionally 
in A. albida, 
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