546 



TREES OF NORTH AMERICA 



ultimately nearly glabrous, \'-^' long, about |' wide, with narrow midveins and ob- 

 scure lateral nerves. Flo"wers on slender pedicels, in heads |'-1' in diameter, on stout 

 peduncles 2'-3' long furnished at the apex witli 2 irregularly 3-lobed bracts, and 

 solitary or in pairs; calyx coated with hairs only near the apex, much shorter than 

 the spatulate glabrous more or less boat-shaped petals; ovary villose, with a few 

 short scattered hairs. Fruit G'-8' long, |'-^' wide, narrowed below into a short stout 



stipe, acuminate and crowned at the apex with the thickened style, ^'-f long, cine- 

 reo-pubescent until nearly fully grown, becoming nearly glabrous at maturity, much 

 compressed, with narrow wing-like margins; seeds conspicuously notched by the 

 hilum, 1' long, Y wide. 



A tree, 15-20 high, with a stem 4'-5' in diameter, and stout zigzag red-brown 

 branchlets marked by numerous pale lenticels, coated at first with short spreading 

 lustrous yellow deciduous hairs found also on the young petioles and lower surface 

 of the unfolding leaflets, the peduncles of the flower-heads and their bracts. Bark 

 about f ' thick, dark brown, divided into low ridges and broken on the surface into 

 small closely appressed persistent scales. "Wood heavy, hard, close-grained, rich 

 brown streaked with red, with thin clear sapwood. 



Distribution. Mountain ravines and the steep banks of streams; western Texas 

 from the valley of the upper San Saba River to that of Devil's River; and southward 

 into Mexico. 



2. Leucaena pulverulenta, Benth. Mimosa. 



Leaves 4'-7' long and 3'-4' broad, with slender petioles usually marked by a large 

 dark oblong gland between the somewhat enlarged base and the lowest pair of pinnae, 

 30-36 nearly sessile crowded pinnse, each with 30-60 pairs of leaflets, and minute 

 caducous stipules; when they unfold covered like the peduncles and flower-buds 

 with dense hoary tomentum, and at maturity puberulous on the petioles and rachises; 

 leaflets linear, acute, rather oblique at the base by the greater development of the 

 upper side, sessile or very short-petiolulate, pale bright green, \'-j' long. Flowers 

 sessile, in heads ^' in diameter, appearing in succession as the branches grow from 

 early spring to midsummer, on slender peduncles I'-l^' long and fascicled in the axils 

 of upper leaves; calyx one fourth as long as the acute petals and like them pilose 



