LEGUMINOS 2, SILVA OF NORTH AMERICA. 17 
LEUCAINA GREGGII. 
LEAvEs 10 to 14-pinnate, glandular, the pinne 30 to 60-foliolate ; stipules spinescent. 
Leuceena Greggii, Watson, Proc. Am. Acad. xxiii. 272 sus U. S. ix. 62 (in part) (not Bentham) (1884); Silva 
(1888). N. Am. iii. 111 (in part). — Coulter, Contrib. U. S. Nat. 
Leucena glauca, Sargent, Forest Trees N. Am. 10th Cen- Herb. ii. 98 (Man. Pl. W. Texas) (in part). 
A tree, from fifteen to twenty feet in height, with a stem four or five inches in diameter covered 
with dark brown bark three eighths of an inch in thickness divided into low ridges and broken on 
the surface into small closely appressed persistent scales, and stout zigzag red-brown branchlets marked 
by numerous pale lenticels and coated at first with short spreading deciduous lustrous yellow hairs, 
which also clothe the young petioles, the lower surface of the unfolding leaves, and the peduncles of 
the flower-heads and their bracts. The leaves are six or seven inches long and broad, with slender 
rachises which are furnished on the upper side with a single elongated bottle-shaped gland between the 
stalks of each pair of pinnez. The pinne are remote and short-stalked, and their leaflets are lanceolate, 
acute or acuminate, often somewhat falcate, nearly sessile or short-petiolulate, full and rounded toward 
the base on the lower margin and nearly straight on the upper margin, gray-green, ultimately nearly 
glabrous, from one quarter to one third of an inch long and about one eighth of an inch wide, 
with narrow midveins and obscure lateral nerves. The stipules are gradually narrowed into long 
slender points which, becoming rigid and spinescent and from one third to nearly one half of an inch in 
length, continue to arm the branches for two or three years. The flowers are produced in heads from 
three quarters of an inch to nearly an inch in diameter which are borne on stout peduncles furnished at 
the apex with two irregularly three-lobed bracts and are from two to three inches in length, and solitary 
or in pairs; they are numerous, white, and sessile in the axils of small peltate bracts villose at the 
apex and raised on slender stalks which lengthen with the growing flower-buds and at maturity are 
as long as the calyx. This is coated with hairs only near the apex and is much shorter than the 
spatulate glabrous more or less boat-shaped petals. The stamens are much exserted, with small 
glabrous oblong anthers, and the ovary is villose, with a few short scattered hairs. The legume is 
linear, from six to eight inches long, from one third to one half of an inch wide, narrowed below 
to a short stout stipe, acuminate and crowned at the apex with the thickened style which varies 
from one third to three quarters of an inch in length, cinereo-pubescent until nearly fully grown but 
nearly glabrous at maturity, and much compressed, with narrow wing-like margins. The seeds are 
conspicuously notched by the hilum, dark chestnut-brown, very lustrous, half an inch long and a third 
of an inch wide. 
Leucena Greggii inhabits mountain ravines and the steep rocky banks of streams, and is 
distributed in western Texas from the valley of the upper San Saba River to that of Devil’s River, and 
southward into Mexico, where it was discovered in the neighborhood of Rinconardo in 1847 by Dr. 
Josiah Gregg.’ 
The wood of Leucena Greggii is heavy, hard, and close-grained, and contains many small regularly 
distributed open ducts, the layers of annual growth and medullary rays being hardly distinguishable. 
It is rich brown streaked with red, with thin clear sapwood. The specific gravity of the absolutely dry 
wood is 0.9235, a cubic foot weighing 57.55 pounds.’ 
l See vi. 33. species, and the description was based partly on Mexican specimens 
2 In preparing the account of Leucena glauca for the fourth of Leucena Greggit. Owing to this mistake, which was subse- 
volume of this work Leucena Greggit was confounded with that quently pointed out to me by Dr. B. L. Robinson of the Gray 
