352 XLVII. § MIMOSEH (OLIVER). | Acacia. 
the seeds; valves thinly coriaceous, finely longitudinally nerved, pube- 
rulous, 4 in. long, } in. broad—A. Giraffe’? Hochst. in Hb. Schimp. 
Abyss. ; Schweinf. Acacien-arten d. Nilgebiets, 355, t. 17, 18. 
Nile Land. Abyssinia, Schimper! Nubia, Dr. Schweinfurth! White Nile, 
— Madi (No. 677), and perhaps also Karagné valley (384), Speke and 
rant: 
One of the species affording the gum arabic of commerce (Dr. Schweinfurth, Acacien- 
arten d. Nil. 357). 
33. A. Ehrenbergiana, Hayne, Arzneigewichse, ix. 29. A shrub; 
extremities smooth, shining, chestnut-brown. Stipular spines usually 
exceeding the leaves, slender, spreading, straight. Leaves small, 
puberulous or glabrate ; pinne 1—2-jugate, leaflets 8-10-jugate, oblong, 
obtuse, midrib obscure, 1—1} lines long. Flowers capitate. Peduncles 
solitary or fascicled in the axils, exceeding the leaf, bearing the invo- 
lucel near or below the middle. Petals united 2 their length, twice 
as long as the calyx. Legume narrow-linear, falcate, broadly con- 
stricted between the seeds, varying to 4} in. in length.—Schweinf. 
Acacien-arten d. Nilgebiets, 352, t. 15, 16. 
Nile Land. Abyssinia, Nubia, Dr. Schweinfurth. 
Also in Egypt and Arabia. 
I have not certainly identified this plant in the Kew Herbarium. The description is 
taken from Dr. Schweinfurth’s memoir. The Arabian plant of Fischer, No. 73 (not 37 
as cited by Mr. Bentham and Dr. Schweinfurth), agrees well with A. Ehrenbergianaas 
figured. The legume of A. Jacquemontii, Benth., is very different. 
34. A. spirocarpa, Hochst.; A. Rich. Fl. Abyss. i. 239. A low 
tree ; extremities red-brown, pubescent. Stipular spines patent, straight, 
slender, varying in length to 24 in. occasionally on the same branch, 
very short, hooked, or obsolete. Leaves in our specimens very short, 
3-14 in. long, petioles pubescent; pinne in 4-10 pairs; leaflets very 
small, oblong, in 7-15 pairs. Peduncles 1 or few, axillary, 1-4 in. 
long, bearing the minute involucel below or near the middle. Flowers 
capitate. Legume spirally twisted or contorted, linear, compressed, 
slightly constricted between the seeds, valves coriaceous, longitudinally 
nerved, pubescent or puberulous, 3-6 in. long, 1} in. broad.—Schweint. 
Acacien-arten d. Nilgebiets, 322, t. 4, 5, 6. 
Nile Land. Abyssinia i i ; 
Kordofan, Dr. Schicsafiath. ee SS 
Dr. Schweinfurth thinks Delile’s A. gummifera (Voy. & Méroé, 21) may be this 
species. It is very imperfectly described. 
So far as I can judge from the description, A. Petersiana, Bolle in Peters’ Mos- 
samb. Bot. i. 4, must be very near to A. spirocarpa. The fruit, however, is unknown. 
The leaves are described as hairy, not exceeding 1 in. in length, with 10 pairs of pinne, 
leaflets very small, linear, in 6-20 pairs. The involucel is inserted on the lower part of 
the peduncle. 
35. A. tortilis, Hayne, Arzneigenichse, ix. 313 Schweinf. Acacien- 
arten d. Nilgebiets, 327. A tree; wholly glabrous, the extremities 
brown or reddish-brown. Stipular spines on the flowering branches 
very short, slightly recurved, ‘‘on barren branches 1 in. long, straight.” 
Pinne in 2-5 pairs, glands cf the rachis when present very minute ; 
