LEGUMINOS 4. 
SILVA OF NORTH AMERICA. 
111 
LEUCAINA GLAUCA. 
BRANCHLETS slightly tomentose or glabrate at maturity. Leaves 16 to 18-pinnate, 
the pinne 20 to 40-foliolate. 
Leuczena glauca, Bentham, Hooker Jour. Bot. iv. 416; 
Trans. Linn. Soc. xxx. 443 (Rev. Mim.). — Walpers, 
fep. i. 884. — Dietrich, Syn. v. 477.— Sargent, Forest 
Trees N. Am. 10th Census U. §. ix. 62. — Coulter, Con- 
trib. U. S. Nat. Herb. ii. 98 (Man. Pl. W. Teaas). 
Mimosa glauca, Linneus, Spec. 520.— Persoon, Syn. ii. 
265. — Poiret, Lam. Dict. Suppl. i. 75. 
Mimosa leucocephala, Lamarck, Dict. i. 12. 
Acacia glauca, Willdenow, Spec. iv. 1075.— De Candolle, 
Acacia biceps, Willdenow, Syec. iv. 1075. — De Candolle, 
Prodr. ii. 467. — Don, Gen. Syst. ii. 418. 
Acacia frondosa, Willdenow, Spec. iv. 1076.— De Can- 
dolle, Prodr. ii. 468. 
Mimosa biceps, Poiret, Zam. Dict. Suppl. i. 75. 
Mimosa frondosa, Poiret, Lam. Dict. Suppl. i. 76. 
Acacia leucocephala, Link, Hnwm. ii. 444. — De Candolle, 
Prodr. ii. 467.— Sprengel, Syst. iii. 1389. — Don, Gen. 
Syst. ii. 418. 
Prodr. ii. 467. — Sprengel, Syst. iii. 139. — Don, Gen. 
Syst. ii. 418. 
A slender tree, with graceful spreading foliage, occasionally rising to the height of twenty or thirty 
feet, with a stem three or four inches in diameter; or more often a broad shrub sending up many 
stems from the ground. The bark of the trunk is three eighths of an inch thick, slightly ridged and 
The branchlets when they first 
appear are coated with short pale pubescence, which gradually disappears, and in their second year they 
dark brown, the surface being broken into short persistent scales. 
are glabrate or only slightly puberulous. The leaves are ten or twelve inches long and six or eight 
inches broad, with stout terete petioles enlarged at the base and an inch and a half to three inches in 
length, sometimes eglandular and sometimes on the same individual furnished with a large conspicuous 
dark gland opposite the lower pair of pinnz or between these and its base. The stipules are minute, 
subulate, and caducous. The pinne are remote and three or four inches in length, with entire acute 
sessile or shortly petiolulate leaflets ; these are oblique or unequal at the base, and from a third to half 
of an inch long, paler on the lower than on the upper surface, and at maturity occasionally slightly 
pilose along the margins and on the under surface ; their midribs are broad and orange-colored for a 
third of their length, and narrow and obscure above the middle of the blade. The flower-heads are 
ovate before anthesis and globose at maturity, two thirds of an inch in diameter, and borne on stout 
pubescent peduncles ; these are furnished at the apex with two irregularly three-lobed pubescent bracts, 
and are solitary or fascicled two or three together in the axils of the upper leaves, or are arranged in 
short terminal racemes, the branches springing from the axils of small scarious bracts. The flowers are 
numerous, sessile, and produced from the axils of minute peltate bractlets borne on long slender stalks 
which lengthen with the growing buds ; these are oblong, obtuse, and densely coated with pale tomen- 
tum. The calyx is a twelfth of an inch long, very short-toothed, covered with pale tomentum, and 
half the length of the petals, which are narrow, acute, and rounded at the apex. The stamens are twice 
as long as the petals and have slender filaments and large oval bright yellow pilose anthers. The ovary 
is glabrous or often more or less covered with thin scattered hairs. The legumes are from four to 
seven inches long and from a half to two thirds of an inch broad, obtuse or acute at the apex, long- 
stalked, and furnished with a short recurved point; they are pubescent until nearly half-grown, and at 
maturity are bright chestnut-brown and glabrous or somewhat puberulous towards the base. Two or 
three or sometimes as many as ten or twelve, often of different lengths, are produced together on a 
single peduncle abruptly and conspicuously thickened at the apex. The seeds are obovate, two thirds 
of an inch long, rounded at the apex and contracted at the base; the testa is thin, bright chestnut- 
brown, and lustrous. 
