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



the seeds ; valves thinly coriaceous, finely longitudinally nerved, pube- 

 rulous, 4 in. long-, £ in. broad. — A. Giraffes ? Hochst. in Hb. Schimp. 

 Abyss. ; Schweinf. Acacien-arten d. Nilgebiets, 355, t. 17, 18. 



Nile Land. Abyssinia, Schimper! Nubia, Dr. Schweinf urth ! White Nile, 

 Consul Petherick! Madi (No. 677), and perhaps also Karague valley (384), Spehe and 

 Grant! 



One of the species affording the gum arabic of commerce {Dr. Schweinfurth, Acacien- 

 arten d. Nil. 357). 



33. A. Ehrenbergiana, Hayne, Arzneir/ewachse, ix. 29. A shrub ; 

 extremities smooth, shining-, chestnut-brown. Stipular spines usually 

 exceeding the leaves, slender, spreading, straight. Leaves small, 

 puberulous or g-labrate ; pinna? 1-2-jugate, leaflets 8-10-jugate, oblong, 

 obtuse, midrib obscure, 1-1 J 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 § their length, twice 

 as long as the calyx. Legume narrow-linear, falcate, broadly con- 

 stricted between the seeds, varying to 4J 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), agrres well with A. Ehrenbergiana as 

 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 2J- in. occasionally on the same branch, 

 very short, hooked, or obsolete. Leaves in our specimens very short, 

 A— 1J in. long, petioles pubescent; pinnae in 4-10 pairs; leaflets very 

 small, oblong, in 7-15 pairs. Peduncles 1 or few, axillary, J— J 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, \- J in. broad. — Schweinf. 

 Acacien-arten d. Nilgebiets, 322, t. 4, 5, 6. 



Nile Land. Abyssinia, Schimper ! Nubia, Dr. Schweinfurth ! Sennaar and 

 Kordofan, Dr. Schweinfurth. 



Dr. Schweinfurth thinks Delile's A. gummifera (Voy. a Meroe, 21) may be this 

 6pecies. 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 pinna?, 

 leaflets very small, linear, in 6-20 pairs. The involucel is inserted on the lower part of 

 the peduncle. 



35. A. tortilis, Hayne, Arzneigervdchse, ix. 31 ; 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." 

 PinniE in 2-5 pairs, glands of the rachis when present very minute ; 



