350 XLVII. § MIMOSEZ (OLIVER). [ Acacia. 
and shining at the apex or stout terete and elongate. Leaves 2-3 in. 
long, villose-pubescent, rachis with a concave sessile gland near the 
base as well as between the upper or all of the ete ael pinne in 6~11 
pairs, leaflets in 10-18 pairs, linear, subacute, 2-2} lines long. Pe- 
duncles axillary, {—-1 in. long, involucel below the middle or near the 
base. Flowers capitate. Petals united 3—4 their length, 2-3 times 
longer than the obtusely 5-toothed pubescent calyx. Legume straight 
or but slightly curved, compressed, linear, broadly pointed or obtuse, 
much narrowed at base, 4—6 in. long, scarcely 4 in. broad, in our 
scarcely ripe specimens; margins continuous or sinuous from abortion, 
valves pubescent-tomentose obscurely longitudinally nerved, 
Lower Guinea. Huilla, Angola, Dr. Welwitsch ! 
Apparently near A. abyssinica and A. Sieberiana. 
29. A. arabica, Willd. Sp. Pl.iv. 1085; Benth. in Lond. Journ. Bot. 
1842, 500. Tree varying much in size in different districts; extremities 
glabrous or shortly pubescent-tomentose, Stipular spines straight or 
nearly so, slender or rather stout below, varying from 0-2 or —3 in. 
Pinne usually in from 3-12 pairs, rachis sidgotn or pubescent with 
or without a sessile gland between the lowest and occasionally 1 or 2 
of the upper pairs; leatlets linear-oblong, obtuse, glabrous, or thinly 
ciliolate, 2-24 lines long, in 10—80 pairs. Peduncles 2-6 from each 
upper axil, occasionally somewhat racemose at the extremities, $14 
in. long, pubescent, bearing the involucel not far from the middle. 
Flowers capitate. Calyx shortly and obtusely lobulate. Petals united 
nearly throughout, twice as long as the calyx. Legume linear, straight 
or slightly curved, compressed, moniliform, the constrictions usually 
deep, each article flat or convex, smooth, varying from 4 to over 3 in. 
in diameter, valves coriaceous, pubescent-tomentose or glabrous; 4-6 
in. long on a stipes of 1-4} in.—A. vera, Willd. l.c. fide Benth. 1.c. ; 
A, nilotiea, Del. Fl. Agypt. Il. 31 and Voy. & Méroé, 22 (var. with 
glabrous fruit); distributed by Hochstetter in Herb. Schimp. under 
the names A. abyssinica and A. Adansonii, according to Richard, FI. 
Abyss. i. 237; Hayne, Arzneigewiichse, ix. t. 82. 
Upper Guinea. Senegambia, Heudelot! and others. Niger, Barter! 
Wile Land. Abyssinia, Dillon! and others. Upper Nile (No. 769), Speke and 
Grant! Nubia, Dr. Schweinfurth! Both on the Blue and White Nile. 
Lower Guinea. Bumbo, Angola (flower only), Dr. Welwitsch! 
Mozamb. Distr. Mouth of Zambesi and Rovuma river, Dr. Kirk! 
Extending eastward through Afghanistan into India; occurring also at Natal (var. 
Kraussiana, Benth.). 
_ On the Upper Nile this species attains a large size, the trunk measuring 8 or 10 ft. 
in girth (S. and G.). : The wood is used in boat-building, and the astringent pods are 
largely used in tanning. Dr. Schweinfurth states that the quantity of gum afforded 
(by A. nilotica, Del.—the form with glabrous fruit) is trifling, and does not become an 
article of trade. 
30. A. Kirkii, Oliv. Very nearly allied to A. arabica, from which it 
principally differs in the tuberculate articles of the legume. Spines 
straight, slender. Pinne in 6-8 pairs with a sessile gland between 
