Leucena.| XLVII. § MIMOSEH (OLIVER). 337 
13. LEUCAINA, Benth.; Benth. et Hook. f. Gen. Plant. i. 594. 
Flowers sessile, capitate, 5-merous. Calyx tubular-funnel-shaped, 
toothed. Petals narrow, free, valvate. Stamens 10, free, exserted ; 
anthers elliptical or oblong, unappendaged, thinly pilese; “‘ pollen- 
grains indefinite.” Ovary shortly stipitate, multiovulate ; style slender ; 
stigma terminal, small, truncate. Legume broadly linear, flat, thinly 
coriaceous, 2-valved ; valves céntinuous. Seeds flat, ovate, transverse ; 
albumen thin.—Unarmed trees or shrubs. Leaves bipinnate, rachis 
with or without glands. Stipules minute. Flower-heads white pedun- 
culate 1-8 from the upper axils or racemose at the extremities. 
A small genus, almost wholly of America, where the following species is probably 
only truly indigenous. 
1.* L. glauca, Benth. in Hook. Journ. Bot. iv. 1842, 416. A small 
unarmed tree, extremities young leaves and inflorescence puberulous. 
Pinne 3-6-jugate, occasionally a sessile gland between the lowest 
pes leaflets linear, often subfalcate, acute, 3-3 in. long. Heads glo- 
ose, white, fin. diameter, on peduncles of 3—14in. from the upper 
axils. Legume flat, straight, 4—6 in. long, 3-3?in. broad, narrowed at 
base into the stipes of }—-?in. (For synonymy see Mr. Bentham’s 
paper, l.c.) 
T have not seen any specimens alleged to be wild from Tropical Africa. It is culti- 
vated here and there through the Tropics, and is frequently sent home by collectors. 
Kotschy distributed it from Kordofan, and T. Vogel collected it (in a garden) in 
Fernando Po. 
14. ACACIA, Willd.; Benth. et Hook. f. Gen. Plant. i. 594. 
Flowers capitate or spicate, sessile or very shortly pedicellate, 
usually 5-4-merous. Calyx campanulate or funnel-shaped, toothed or 
lobed. Petals free or united more or less, valvate. Stamens indefinite, 
exserted, free or consolidated at base with the disk; anthers minute ; 
“pollen usually cohering in 2-4 masses in each cell.” Ovary sessile 
or stipitate ; ovules few or many; style slender with a small terminal 
stigma. Legume usually linear or oblong, flat, convex or terete, 
Straight falcate or twisted, membranous coriaceous or woody, 2-valved 
or indehiscent, continuous or septate within; very rarely separating 
into articles. Seeds compressed.—Trees or shrubs, in African species 
usually spinose. Leaves bipinnate. Stipules spinescent, inconspicuous 
or submembranous. Bracts usually cohering in an involucel towards 
the middle, or at one extremity of the peduncle. 
A very large genus, of which a great proportion is peculiar to Australia, the rest 
scattered through tropical and subtropical regions of both hemispheres. No subgenus 
or section is peculiar to Africa, although many of the species appear to be so. It is 
probable that on a general revision of the genus Acacia the forms grouped under and 
around A. Catechu amongst the spicate-flowered, and A. pennata amongst the capitate- 
flowered species, may be differently distributed. I can only regard their treatment 
here as provisional. Too much reliance must not be placed on the alternatives of the 
following Clavis. 
VOL, I1. Z 
