342 xlvii. § mimose^e (oliver). [Acacia. 



linear-oblong, apiculate or pointed, margins continuous, 2-valved, 5-6- 

 seeded, valves thin but firmly coriaceous, glabrous or pulverulent, 

 obscurely reticulate, 3-5 in. long, |-f in. broad. 



Lower Guinea. On the Zenza, B do Bengo, Loanda and Ambriz, Angola, Dr. 

 Welwitsch I 



Mozamb. Distr. Zambesi, belo,w Tette, Dr. Kirk! 



8. A. Verek, Guill. et Perr. Ft. Seneg. i. 245, t. 56. Branches pale, 

 glabrous or glabreseent. Infra- stipular prickles geminate or ternate, 

 short, polished, recurved. Leaves in our specimens not exceeding 

 1-1-| in., rachis pubescent with a gland between the upper pinnae and 

 one near the base ; pinnae in 3-5 pairs, leaflets in 10-15 pairs, linear- 

 oblong, scarcely acute, 2 lines long more or less. Spikes exceeding 

 the leaves, shortly pedunculate, axillary, solitary, or 2 or 3 together, 

 2-3 in. long. Flowers sessile, glabrous or glabrate, rather lax. Calyx 

 cupuliform, toothed to the middle. Petals free or irregularly cohering, 

 rather longer than the calyx. Legume oblong, straight, flat, margin 

 continuous or slightly sinuous, owing to occasional abortion of seeds, 

 obtuse or mucronate, narrowed at base, 3-4 in. long, f-1 in. broad, 

 valves thinly coriaceous, obsoletely puberulous, obscurely reticulate. 

 " Seeds subrotundate, much compressed, as long as broad or sometimes 

 broader than long.'' Schweinf. Acacien-arten d. Nilgebiets, 374, t. 22 a. ; 

 Reliq. Kotschyanse, t. 3. 



Upper Guinea. Senegambia, Heudelot! Brunner ! Bidjem! 



Nile Land. Southern JSfubia, Dr. Schweinfurth. Kordot'aii, Cienkowsky. 



Guillemin and Perrottet reduce here Mimosa senegalevsis, Lam. _ This species 

 affords, according to these botanists, an important part of the Gum Arabic, of commerce, 

 and according to Dr. Schweinfurth {Reliq. Kotschyance, 4), the best white gum of the 

 Nile region. Upon the gums of Senegal, see a Memoir by Dr. Fliickiger in Schweiz. 

 Wochenschrift Pharm. 1869, with a figure of A. Verek. 



Allied to A. Verek is a plant in flower only, with but a single developed leaf, in Dr. 

 Welwitsch's herbarium from Mossamedes. The calyx and petals are externally mi- 

 nutely sericeous (" lepidote-sericeus" Welw). The petals are free from the base, 

 about twice as long as the calyx ; the ovary glabrous on a stipes of its own length. 

 Flowers precocious. 



9. A. glaucophylla, Steud. ; A. Rich. Fl. Abyss, i. 243. Tree or 

 large shrub, wholly glabrous or extremities puberulous; branches 

 brown or reddish-brown to grey. Infra-stipular prickles geminate or 

 ternate, short, straight or slightly recurved, frequently wantiDg. 

 Leaf-rachis from 1J-3J in., minutely pubescent or glabrous, usually 

 with a small gland near the base ; pinnae 3-6- jugate, leaflets in 12-20 

 pairs, oblong or oval-oblong, obtuse, 3-5 lines long. Inflorescence and 

 flowers as in A. Verek, the spikes usually shorter than the leaves. 

 Ovary glabrous. Legume linear, straight, flat, apiculate or acuminate, 

 narrowed at base, 3-4J in. long, J-| in. broad, valves thinly coriaceous, 

 glabrous, finely transversely reticulate, slightly convex over each 

 seed. " Seeds oval, longer than broad" (Schweinfurth). — A. triacantha, 

 Hochst. ; A. Rich. I.e. 244 ; Schweinf. Acacien-arten d. Nilgebiets, 

 372, t. 22 b. 



