Acacia.] xlvii. § mimose^e (oliver). 349 



faintly longitudinally striate, pale yellowish grey, puberulous, narrowly 

 subalate, few (5-10) -seeded, 2-3 in. long-, about \ in. broad. — A. 

 Auckeri, Benth. I.e. 499 ; A. pterygoearpa, Hochst., Benth. in Journ. 

 Bot. 1846, 96. 



Nile Land. Abyssinia, Schimper! Nubia, Kotschy ! Schweinfurth I 

 The same plant occurs in Aucher-Eloy's Oriental Herbarium (No. 4372) ; identified 

 by Mr. Bentham with A. pterygocarpa. Dr. Schweinfurth distinguishes two varieties : 

 a. erythrcea (= A. pterygocarpa) with fewer and laxer pinnae and leaflets, sometimes 

 curved spines and precocious flowers ; and /3. cethiopica (—A. nubica) with more nume- 

 rous and denser pinnse 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 1-2 J in. long, glabrous 

 or obsoletely puberulous, eglandular excepting frequently between the 

 pinnae occurs a small gland depressed in the centre ; pinnae in 2-3 

 (1-5) pairs, leaflets 7-15-jugate, oblong or' oval-oblong, more or less 

 obtuse, coriaceous, J-J in. long, 1-1J lines broad. Flowers yellow, 

 capitate, on straight fascicled axillary peduncles, J— 1 in. long, bearing 

 the involucel below the middle. Calyx shortly and obtusely toothed. 

 Petals united §— § 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, 1J-2 in. long, ^-| 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 ; pinnae in 3-6 pairs, with or without interposed 

 glands ; leaflets in 14-30 pairs, oblong obtuse, rather thick, closely 

 and uniformly ranked, 1—1 § lines long. Peduncles 3-5 in each axii, 

 J 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 ; 1 J-3 J- in. long, 

 \ in. broad. — A. xiphocarpa, Hochst. in Hb. Schimp. Abyss. No. 1057. 



Nile Land. Nubia, Soturba, Schweinfurth! Abyssinia, Schimper! Dillon and 

 Petit I 



Lower Guinea. Benguella, Dr. Welwitsch! (prickles very short, recurved). 



The name A. xiphocarpa I 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 arable. 



28. A. tristis, Welti), mss. Tree of 15-20 ft., covered with a grey 

 tomentose-pubescence. Stipular spines very short, conical, glabrous 



