Feather Tree

Lysiloma thornberi Britton & Rose, sp. nov
A shrub or small tree; young twigs pilose, but glabrate in age. Leaves 10 to 15 cm. long; stipules 10 to 12 mm. long, ovate, thin, caducous; petiole and rachis pilose; petiole bearing a small, slightly elevated gland; pinnae 6 to 8 pairs; leaflets 20 to 35 pairs, linearoblong, 5-6 mm. long, obtuse, glabrous, the midrib nearly central; peduncles slender, 2 to 3 cm. long, pilose; flowers capitate, sessile, white; calyx 1.5 mm. long, densely pubescent; corolla somewhat longer than the calyx; stamen-sheath short; legume oblong, 10-17 cm. long, 12-20 mm. wdde, glabrous, glaucous, stipitate, apiculate, the base cuneate.
Rincon Mountains, Arizona. Type collected in 1926 by J. J. Thornber.

Lysiloma brevispicata (Rose) Britton & Rose
Lysiloma acapulcensis brevispicata Rose, Contr. U-. S. Nat. Herb. 1: 100. 1891.
A tree, 10-13 m. high, with a trunk up to 3 dm. in diameter, or larger, the twigs pilose. Stipules caducous; petioles pilose, bearing a large gland near the middle; pinnae 3-5 pairs; leaflets many pairs, linear, 4—5 mm. long, hairy on both sides; peduncles axillary, in clusters of 3-6, pilose, 3-4 cm. long; flowers pubescent, sessile, in dense spikes 12-20 m n. long; calyx about 2 mm. long; corolla about 3 mm. long; stamens 2-3 times as long as the corolla.
Type locality: Near Alamos, Sonora. Distribution: Known only from the type locality.