Thornbera revoluta

Thornbera revoluta (S. Wats.) Rydberg
Dalea revoluta S. Wats. Proc. Am. Acad. 22: 404. 1887. Parosela revoluta Rose, Contr. U. S. Nat. Herb. 10: 105. 1906.
A perennial, with a woody root and a short cespitose caudex; stems 3-6 dm. high, glabrous, angled, glandular-dotted; leaves 1-3 cm. long, spreading; stipules filiform, 3 mm. long; rachis glabrous, copiously glandular-dotted; leaflets about 21, linear, revolute, glabrous, densely glandular-dotted, 4—10 mm. long; peduncles 3-8 cm. long; spikes dense, 1.5-4 cm. long, 6-7 mm. thick; bracts ovate, acuminate, puberulent, densely punctate, persistent, ciliate at the base; calyx-tube campanulate, 10-ribbed, densely short-pilose, with a row of glands in the intervals, 2 mm. long; lobes lanceolate, 1 mm. long, pilose; corolla white or the banner tinged with rose; blade of the banner round-ovate, truncate at the base, 2 mm. long, the claw 2.5 mm. long; blades of the other petals obliquely oblong, cuneate at the base on the lower and rounded on the upper edge, 2 mm. long, the claws 0.5 mm. long; pod densely pubescent.
Type locality: Guadalajara, Jalisco.
Distribution: Sonora to Jalisco.