840 XLVI. § MIMOSEH (OLIVER). [ Acacia. 
Guillemin and Perrottet (Fl. Seneg. 245) would refer A. Senegal, Willd., DC. Prod. il. 
459, to this species. Mr. Bentham leaves the identification of this plant and of A . Asak, 
Willd. doubtful (Hook. Journ. Bot. 1842, 509), but notes that they “are evidently 
near A. hamulosa, Bth. (an Arabian species) and A. Verek,G. and P., and perhaps 
identical with the one or the other.” 
2. A. Lahai, Steud. et Hochst.; Benth. in Lond. Journ, Bot. 1842, 
506. A small or medium-sized tree; extremities glabrous, with a 
brownish or ashen bark. Stipular spines occasionally very short, 
usually prominent, patent, straight, }—2 in. long, flattened below on 
the upper face. Leaves puberulous or glabrescent; rachis 1}—4 in., 
with a small gland near the base; pinne in 7-13 pairs; leaflets linear- 
oblanceolate or linear, rather obtuse, in 12-26 pairs, 1}—2 lines long. 
Spikes axillary solitary or 2-8 together, 2-4 in. long. Flowers sessile. 
Petals free at the apex, about 4 times as long as the short deltoid-toothed 
calyx. Legume broadly oblong, obtuse, minutely apiculate, abruptly 
narrowed at base into a stipes of }-4 in., flat, valves coriaceous, brown, 
shining, much reticulate, 2-24 in. long, 3-1} in. broad.—A. Rich. Fl. 
Abyss. i. 240; Schweinf. Acacien-arten d. Nilgebiets, 359. 
Wile Land. Abyssinia, Dillon and Petit! Schimper! Capt. Pullen! 
3. A. mellifera, Benth. in Hook. Lond. Journ. Bot. 1842, 507. Shrub 
or small tree, wholly glabrous, with brownish or sometimes pale and 
glaucous extremities, unarmed excepting a pair of short recurved infra- 
stipular prickles, usually below each node. Leaves as broad as long, 
not exceeding 1—2 in., glaucous at least beneath; pinne in 2 pairs; 
leaflets unijugate, obliquely obovate-oblong or obovate-rotundate, ob- 
tuse entire or retuse, the larger leaflets }~4 in. long. Spikes axillary, 
fascicled, equalling or exceeding the leaves. Pedicels about equalling 
the short truncate calyx. Petals 3-5 times longer than the calyx, 
apparently united to the middle. Legume flat, few-seeded, oblong, 
continuous or sinuous, apiculate, narrowed at base, valves thinly coria- 
ceous, transversely venose, pale and glabrous, 14-2 in. long, $—3 in. 
broad.— Mimosa mellifera, Vahl, Symb. ii. 103, and Inga mellifera, Willd. 
Sp. PL. iv. 1006 (fide Benth. Lc.) 
Upper Guinea. Niger, Barter! (‘ Yields a gum like gum-arabic.”) 
Nile Land. Abyssinia, Schimper! Nubia, Dr. Schweinfurth! Sennaar, Kotschy! 
Kordo/an and Upper White Nile, Dr. Schweinfurth ! 
Also on the Arabian side of the Red Sea. 
4. A. nigrescens, Oliv. Arborescent, wholly glabrous; young 
shoots, peduncles, and leaves more or less glaucous. Infra-stipular 
spines geminate, very acute, short or sharply recurved, brownish-black. 
Leaves 13-23 in. long ; rachis slender, with 1 (or 2) slightly elevated 
gland; pinne 8-jugate ; leaflets 1-jugate, broadly and very obliquely 
obovate-rotundate, entire or retuse, reticulate, drying blackish paler 
beneath, 4—} in. long, 3—5 lines broad. Spikes axillary, solitary in our 
specimen, a little exceeding the leaves; flowers rather lax ‘at least 
below, sessile or subsessile. Calyx deeply rather acutely toothed. Petals 
