Leuccena.] xlvii. § mimose^e (oliver). 337 



« 13. LETJCJENA, 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 pilose; " pollen- 

 grains indefinite." Ovary shortly stipitate, multiovulate ; style slender ; 

 stigma terminal, small, truncate. Legume broadly linear, flat, thinly 

 coriaceous, 2-valved ; valves continuous. Seeds flat, ovate, transverse ; 

 albumen thin. — Unarmed trees or shrubs. Leaves bipinnate, rachis 

 with or without glands. Stipules minute. Flower-heads white pedun- 

 culate 1-3 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. 

 Pinnae 3-6-jugate, occasionally a sessile gland between the lowest 

 pair ; leaflets linear, often subfalcate, acute, J^J in. long. Heads glo- 

 bose, white, fin. diameter, on peduncles of j-ljin. from the upper 

 axils. Legume flat, straight, 4-6 in. long, |-| in. broad, narrowed at 

 base into the stipes of J— § in. (For synonymy see Mr. Benth am 's 

 paper, I.e.) 



I 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. 

 Kolschy 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 boih 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. 



