352 NORTH AMERICAN FLORA [Volume 24 



leaflets 15-19, oblong to cuneate-obovate, 8-15 mm. long, 4-5 mm. wide, truncate to obcordatc 

 at the apex, short-villous; peduncles 3-5 cm. long; racemes short, few-flowered; calyx short- 

 villous, the tube 2 mm. long, the lobes subulate, 2 mm. long; corolla 8 mm. long, ochroleucous, 

 with purple-tipped keel; banner obovate; wings nearly as long, the blade obliquely oblanceolatc, 

 somewhat falcate; keel-petals shorter and broader, the blade semi-orbicular, shorter than the 

 claw; pod nearly globose, 1-1.5 cm. long, purple-spotted, sessile, short-villous, the lower 

 suture deeply inflexed. 



Type locality: Sink Valley, southern Utah. 

 Distribution: Southern Utah and northern Arizona. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 44, f. 160. 



58. Phaca cerussata (Sheldon) Rydb. Bull. Torrey Club 

 32:665. 1906. 



Astragalus triflorus Porter & Coult. Syn. Fl. Colo. 27, in part. 1874. Not A . triflorus A. Gray, 1853. 

 Astragalus cerussatus Sheldon. Minn. Bot. Stud. 1: 139. 1894. 

 Astragalus trijlorus cerussatus M. E. Jones. Rev. Astrag. pi. 11. 1923. 



Perennial, stems erect to spreading, 2-3 dm. high, striate, sparingly pilose; leaves 4-8 cm- 

 long, spreading; stipules deltoid, acuminate, 3-5 mm. long; leaflets 11-17, oblong to obovate> 

 emarginate, 5-12 mm. long, villous-pilose on both sides or glabrate above; peduncles 4-6 cm- 

 long; racemes 3-10-flowered, 2-4 cm. long; calyx pilose, the tube 2 mm. long, the lobes subulate. 

 2 mm. long; corolla tipped and veined with purple, 7-S mm. long; banner obovate, retuse and 

 reflexed; wings slightly shorter, the blade oblong, with an acute basal auricle; keel-petals 

 strongly arcuate, obtuse, with a rounded auricle; legume sessile, pilosulous, slightly tinged with 

 purple, but not mottled, 1.5-2 cm. long, about 1 cm. wide; seeds obliquely round-reniform, 

 2 mm. long. 



Type locality: Canon City. Colorado. 



Distribution: Central and southern Colorado and northwestern New Mexico. 



Illustration: M. E. Jones, Rev. Astrag. pi. 11. 



59. Phaca pardalina Rydberg, sp. nov. 



Perennial, with a taproot; stems spreading or ascending, grayish-villous, terete, 1-2 dm. 

 long; leaves 3-6 cm. long, spreading; stipules lanceolate or deltoid, acuminate, 2-4 mm. long; 

 leaflets 9-13, oblong or those of the lowei leaves obovate, rounded or rarely retuse at the apex, 

 4-10 mm. long, grayish-villous on both sides; peduncles 3-5 cm. long, erect; racemes 5-10- 

 flowered, 2-5 cm. long; bracts subulate, 2-3 mm. long; pedicels 2-3 mm. long; calyx villous, the 

 tube 3 mm. long, the lobes subulate, 2 mm. long; corolla purple or white, 7-8 mm. long; banner 

 broad, strongly arcuate at the middle; wings nearly as long, the blade oblanceolate-falcate, 

 with a 'arge basal auricle; keel-petals shorter, the blade broadly lunate; legume sessile, villous, 

 ellipsoid, 2 cm. long and fully 1 cm. wide, yellowish, with purplish-brown blotches. 



Tvpe collected on Cedar Mountain, Green River, Utah, May 20, 1915, M. E. Jones (herb. 

 N. Y. Bot. Garden). 



Distribution: Utah and northwestern New Mexico. 



60. Phaca zacatecana Rydberg, sp. nov. 



Annual or short-lived perennial; stem about 3 dm. high, branched near the base, decumbent 

 at the base, strigose-canescent when young; leaves ascending, 4-6 cm. long; stipules deltoid, 

 3-4 mm. long; leaflets 1 1-17, obovate or elliptic, 8-12 mm. long, glabrous above, villous-pilose 

 beneath, rounded at the apex; peduncles 2-3 cm. long; racemes about 2 cm. long, 3-5-flowered; 

 bracts lanceolate, 1 mm. long; calyx pilose, the tube 2.5 mm. long, the teeth subulate, 2 mm. 

 long; corolla yellow, 6 mm. long; banner broadly obovate, strongly arched at the middle; 

 wings almost as long, the blade obliquely obovate, with a laige basal auricle ; keel-petals shorter, 

 the blade broadly lunate, acutish; pod ellipsoid, acute at each end, about 2.5 cm. long and 12 

 mm. wide, strigose. 



Type collected at Casualidad, Zacatecas, April 26, 1892, M. E. Jones (herb. N. Y. Bot. Card.). 



