LEGUMINOS^E 



605 



long, on slender pedicels '-' in length and fascicled in sessile clusters, or occasionally^ 

 racemose. Fruit 2'-4' long, '-1' wide; seeds \' long. 



A slender tree, occasionally 20 or rarely 40 high, with a trunk 6'-12' in diameter, and 

 glabrous branchlets marked by numerous minute white lenticels, light reddish brown 

 during their first and second years, becoming dark brown in their third season; more 

 often a shrub, sending up numerous stems and forming dense thickets only a few feet high. 



Fig. 555 



Bark of the trunk and branches thin, smooth, light gray. Wood heavy, hard, close-grained f 

 brown streaked with yellow, with thin lighter colored sapwood of 5 or 6 layers of annual 

 growth. 



Distribution. Limestone hills and ridges; neighborhood of Dallas, Dallas County, 

 Texas to the Sierra Madre of Nuevo Leon; common in the valley of the upper Colorado 

 River, Texas; of its largest size on the mountains of northeastern Mexico. 



7. GYMNOCLADUS Lam. 



Trees, with stout unarmed blunt branchlets with a thick pith, prolonged by axillary 

 buds, rough deeply fissured bark, thick fleshy roots, and minute buds depressed in pubes- 

 cent cavities of the bark, 2 in the axil of each leaf, superposed, remote, the lower and 

 smaller sterile and nearly surrounded by the enlarged base of the petiole, their scales 2, 

 ovate, rounded at apex, coated with thick dark brown tomentum, infolded one over the 

 other, accrescent with the young shoots. Leaves deciduous, unequally bipinnate; pinna? 

 many-foliolulate, with 1 or 2 pairs of the lowest pinnse reduced to single leaflets; pinnae 

 and leaflets usually alternate; leaflets thin, ovate, entire, petiolulate; stipules foliaceous, 

 early deciduous. Flowers regular, dioecious, greenish white, long-pedicellate, the slender 

 pedicels from the axils of long lanceolate scarious caducous bracts, bibracteolate near the 

 middle; stamina te flowers in a short terminal racemose corymb; pistillate flowers in 

 elongated terminal racemes, on pedicels much longer than those of the staminate flowers; 

 .calyx tubular, elongated, 10-ribbed, lined with a thin glandular disk, 5-lobed, the lobes 

 lanceolate, acute, nearly equal, erect; petals 4 or 5, oblong, rounded or. acute at apex, 

 pubescent, as long as the calyx-lobes or rather longer and twice as broad, inserted on the 

 margin of the disk, spreading or reflexed; stamens 10, free, inserted with the petals, erect, 

 included; filaments filiform, pilose, those opposite the petals shorter than the others; 

 anthers oblong, uniform, small and sterile in the pistillate flower; ovary sessile or slightly 

 stipitate, acute; styles short, erect, obliquely dilated into 2 broad lobes stigmatic on their 



