356 NORTH AMERICAN FLORA [Volume 24 



72. Phaca sabulonum (A. Gray) Rydb. Bull. Torrey Club 

 40:47. 1913. 



Astragalus sabulonum A. Gray, Proc. Am. Acad. 13: 368. 1878. 



Astragalus sabulorum S. Wats. (err.| Bibl. Ind. 463. 1878. 



Astragalus virgineus Sheldon; Coville, Contr. U. S. Nat. Herb. 4: 88. 1893. 



Annual; stem 5-15 cm. high, with spreading branches, canescent with ascending hairs; 

 leaves 3-5 cm. long, the raehis canescent; stipules deltoid, acuminate, 3-4 mm. long; leaflets 

 9-13, oblong or oblong-oblanceolate, 8-12 mm. long, 2-4 mm. wide, canescent on both sides; 

 peduncles 1-4 cm. long; raceme short, 3-6-flowered ; calyx silky-strigose, the tube 2-2.5 mm. 

 long, the lobes subulate, 2 mm. long; corolla described as purple or violet, but apparently white, 

 with striate banner; petals as in P. annua; pod hirsute, sessile, about 1.5 cm. long and 8 mm. 

 wide, obliquely ovoid, the lower suture gibbous, the upper acute and nearly straight. 



Type locality: Southeastern Nevada, near the confluence of Muddy River with Rio Virgin. 

 Distribution: Southern Nevada to northwestern Sonora. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 9, f. 36. 



73. Phaca arenicola Rydberg, sp. nov. 



Perennial; stem somewhat woody at the base, silky-canescent, the branches decumbent 

 below; leaves 5-8 cm. long, the raehis canescent; stipules deltoid, acuminate, distinct, 3-5 mm. 

 long; leaflets 9-13, obovate, rounded to refuse at the apex, 5-10 mm. long, 3-5 mm. wide, 

 appressed silky-canescent; peduncles 3-5 cm. long; racemes 2-3 cm. long, 3-10-flowered; calyx 

 silky-canescent, the tube 2-2.5 mm. long, the lobes lance-subulate, 2.5-3 mm. long; corolla 

 about 6 mm. long, apparently white, streaked with purple; banner broadly obovate; wings some- 

 what shorter, the blade broadly obliquely obovate, with a large basal aur'cle; keel-petals 

 similar, strongly arcuate, obtuse at the apex; pod (not mature) sessile, hirsute, more than 1 cm. 

 long, the lower suture gibbous, the upper acute and somewhat upcuived. 



Type collected in sand at Mecca, Salton Basin, Southern California, Feb. 28, 1913, Parish 8467 

 (herb. N. Y. Bot. Gard.). 



74. Phaca lerdoensis Rydberg, sp. nov. 



Annual; stem with decumbent or spreading branches, less than 1 dm. long, hirsutulous- 

 canescent; leaves 2-3 cm. long; stipules distinct, deltoid, 2 mm. long; leaflets 7-1 1, obovate to 

 oblong, about 5 mm. long, hirsute-canescent; peduncles 1-2 cm. long; racemes 3-5-flowered; 

 calyx hirsute, the tube 2 mm. long, the lobes 2 mm. long; corolla purple-tinged with darker 

 veins, 6 mm. long; banner broadly obovate; wings somewhat shorter, the blade oblong-lunate, 

 obtuse, with a long basal auricle; keel-petals broader, strongly gibbous-arcuate, obtuse; pod 

 sessile, hirsute, 12-15 mm. long, gibbous on the lower suture, nearly straight on the upper. 



Type collected at Colonia Lerdo, northern Sonora, February, 1904, MacDougal (herb. N. Y. 

 Bot. Gard.). 



18 Pubentissimae. Low cespitose perennials with a woody caudex; the stems slender 

 and decumbent. Flower-clusters small, few-flowered, shorter than the leaves. Calyx-teeth 

 subulate, almost equaling the tube. Corolla yellowish-white, small. Pod small, less than 1 cm. 

 long, obliquely ovoid, acuminate, the upper suture straight or upcurved. 



75 Phaca pubentissima (T. & G.) Rydb. Bull. Torrey Club 



40: 48. 1913. 



Astragalus multicaulis Nutt.; T. & G. Fl. N. Am. 1: 335. 1838. Not .4. multicaulis Ledeb. 1831. 

 Astragalus pubenlissimus T. & G. Fl. N. Am. 1: 693. 1840. 

 Tragacanlha pubentissima Kuntze, Rev. Gen. 947. 1891. 

 Astragalus Peabodyanus M. E. Jones, Zoe 3: 295. 1893. 



Perennial, with a deep root; stems several, branched, about 1 dm. high or less, canescent - 

 strigose; leaves 3-5 cm. long, ascending; stipules deltoid, membranous, 3 mm. long; leaflets 

 7-13, obovate, 3-6 mm. long, obtuse, canescent with long ascending hairs; peduncles 1-3 cm. 

 long; racemes 3-5-flowered; calyx pilose-canescent, the tube 3 mm. long, the lobes subulate, 



