118 NORTH AMERICAN FLORA [Volume 24 



lets 15-23, oblong, villous, somewhat involute, 3-4 mm. long; peduncles 2-4 cm. long; spikes 

 dense, 2-8 cm. long, 7 mm. thick; bracts linear-lanceolate, attenuate, longer than the calyx; 

 calyx-tube campanulate, villous, 2 mm. long, 10-ribbed, with a row of glands in the intervals; 

 lobes subulate, pilose, equaling or exceeding the tube; corolla white; blade of the banner 

 suborbicular; blades of the other petals oblong-oblanceolate, 2 mm. long, the claws about 1 

 mm. long; pod densely long- villous and somewhat gland-dotted above, glabrate below. 



Type locality: Frayles, Chihuahua. 

 Distribution: Known only from the type locality. 



3. Thornbera villosa Rydberg, sp. nov. 



A perennial, shrubby at the base; stem 3-5 dm. high, densely long villous, terete; leaves 

 2-3 cm. long; stipules subulate-setaceous, about 2 mm. long; rachis densely villous; glands and 

 stipels concealed; leaflets 13-15, oval, or obovate, densely silky-villous, 3-5 mm. long; pedun- 

 cles terminal, 2-4 cm. long; spikes 2-4 cm. long, about 1 cm. thick; bracts lanceolate, acumi- 

 nate, densely silky and glandular-dotted, about equaling the calyx; calyx-tube campanulate, 

 silky-villous, with a row of brownish glands between the ribs, 2 mm. long; lobes filiform, with 

 a lanceolate base, plumose; corolla white; blade of the banner rounded-reniform, 2 mm. long 

 and broad, the claw 3 mm. long; blades of the other petals oblong, 3 mm. long, slightly if at all 

 oblique at the base, the claws about 0.5 mm. long. 



Tvpe collected in the Santa Rita Mountains, Arizona, 1902, Griffiths b" Thornber 130 (herb. N. Y. 

 Bot. Card.). 



Distribution: Santa Rita and Santa Catalina Mountains, Arizona. 



4. Thornbera albiflora (A. Gray) Rydb. Jour. N. Y. Bot. 

 Gard. 20: 66. 1919. 



Dalea albiflora A. Gray, PI. Wright. 2: 38. 1853. 



Parosela albiflora Vail, Trans. N. Y. Acad. Sci. 14: 34. 1894. 



A perennial, somewhat shrubby at the base; stems several, 3-6 dm. high, densely short- 

 villous, terete, branched; leaves 3-5 cm. long, spreading; stipules filiform, 3 mm. long; rachis 

 villous and sparingly and minutely glandular-dotted, black; stipels represented by yellow 

 glands; leaflets 21-31, crowded, oblong, obtuse, 5-8 mm. long, sparingly villous on both sides, 

 glandular-dotted beneath; peduncles 2-8 cm. long; spikes dense, 1.5-6 cm. long, 8 mm. thick; 

 bracts lanceolate, long-attenuate, usually longer than the calyx, pilose and glandular-dotted 

 below; calyx-tube campanulate, sharply 10-ribbed, 2.5 mm. long, densely pilose, with a row 

 of glands in the intervals; lobes lance-subulate, nearly 2 mm. long, plumose; corolla white; 

 blade of the banner suborbicular, with a cordate base, 3 mm. long, glandular near the base, 

 the claw 3 mm. long; blades of the other petals broadly obliquely obovate, rounded at the apex, 

 rounded on the upper and tapering on the lower edge of the base, 2.5 mm. long, the claws 1 

 mm. long; pod finely and densely pubescent and glandular-dotted above, glabrous at the base. 



Type locality: Hillsides on the San Pedro. Sonora. 

 Distribution: New Mexico, Arizona, Sonora, and Chihuahua. 



5. Thornbera leucantha Rydberg, sp. nov. 



A perennial, somewhat shrubby at the base; stems 3-5 dm. high, finely puberulent, often 

 reddish; leaves 2-4 cm. long; stipules subulate, 2 mm. long; rachis finely puberulent; stipels 

 gland-like; leaflets 21-27, linear-oblanceolate or linear, puberulent, 7-10 mm. long; peduncles 

 2-4cm. long; spikes dense, 2-4 cm. long, 7-8 mm. thick; bracts lanceolate, pilose and glandu- 

 lar-dotted, shorter than the calyx; calyx-tube campanulate, 2 mm. long, short-pilose, 10- 

 ribbed, glandular-dotted in the intervals; lobes subulate-filiform, plumose, about equaling the 

 tube; corolla white; blade of the banner round-oval, truncate at the base, about 3 mm. long, 

 the claw 3 mm. long; other petals obliquely oblanceolate, or oblong-oblanceolate, 3 mm. long, 

 the claws 1.5 mm. long; pod pilose and glandular-dotted above, glabrate at the base. 



Type collected near Providencia, Durango, September 11-12, 1898, E. W. Nelson 4996 (U. S. 

 Nat. Herb. no. 333023). 



