444 NORTH AMERICAN FLORA [Volume 24 



6. Astragalus Humboldtii A. Gray, Proc. Am. Acad. 6: 195. 1S64. 



Phaca mollis H.B.K. Nov. Gen. & Sp. 6: 496. 1824. 

 Tragacantha mollis Kuntze, Rev. Gen. 941. 1891. 

 Astragalus Orizabae Seaton. Proc. Am. Acad. 28: 117. 1893. 



A cespitose perennial, with a short woody caudex; stems decumbent, 2-4 dm. long, 

 densely tomentose with a mixture of short straight hairs and a fine tomentum; leaves 1-2 dm. 

 long, ascending; stipules deltoid, acuminate, herbaceous, 5-8 mm. long; rachis pubescent as 

 the stem; leaflets 25-35, oblong or lance-oblong, obtuse or acute, 1-2.5 cm. long, densely 

 and closely silky-pubescent; peduncles 1—1.5 dm. long; racemes 3-6 cm. long; bracts linear- 

 lanceolate, 3-5 mm. long; calyx silky, the tube about S mm. long, 3 mm. broad, the teeth 5 

 mm. long, subulate; corolla purple, or yellowish, tipped with purple, 15-20 mm. long; banner 

 obovate; wings shorter, the blade oblong, with a large basal auricle; keel-petals still shorter, 

 the blade broadly acunate, rounded at the apex; pod ovoid, only slightly curved, 15-18 mm. 

 long, fully 10 mm. thick and 5 mm. wide, densely short-pubescent, deeply sulcate on both 

 sutures, cordate at the base. 



Type locality: Gasave, Valley of Mexico. 

 Distribution: Southern Mexico. 



Illustrations: H.B.K. Nov. Gen. & Sp. pi. 5S5; M. E. Jones, Rev. Astrag. pi. 59, pi. 60, f. 

 1 93 (as A. Orizabae). 



7. Astragalus Earlei Greene, sp. nov. 



Astragalus Humboldtii M. E. Jones, Rev. Astrag. 232. 1923. Not .4. Humboldtii A. Gray. 1864. 



A cespitose perennial, with a woody root; stems several, very short or sometimes 1-2 dm. 

 long and decumbent, densely villous-tomentose, usually yellowish; leaves 1-3 dm. long, 

 ascending; stipules deltoid, 5-8 mm. long; leaflets 25-35, oval or obovate, 0.5-2 cm. long, 

 densely silky-villous with mostly appressed yellowish hairs; peduncles 1-3 dm. high; racemes 

 dense, 5-1.5 cm. long; bracts lance-subulate, 5-7 mm. long; calyx densely silky, the tube 5-6 

 mm. long, 3 mm. broad, the teeth subulate, 3 mm. long; corolla white or purplish, about 15 

 mm. long; banner obovate, moderately arched; wings shorter, the blade oblong, with a large 

 auricle; keel-petals 12 mm. long, the blade broadly lunate, rounded at the apex; pod lance- 

 oblong, abruptly acuminate, 12-15 cm. long, 5 mm. thick and 3 mm. wide, rather densely 

 short-pubescent, sulcate on both sutures. 



Type collected in Limpia Canon, Texas, April 5-May 3 [Apr. 25], 1902, Earle & Tracy 226 

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



Distribution: Western Texas. New Mexico, and Chihuahua. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 59, f. 190 (as A. Humboldtii). 



8. Astragalus irolanus (M. E. Jones) Rydberg, sp. nov. 



Astragalus Orizabae irolanus M. E. Jones, Rev. Astrag. 234. 1923. 



A perennial; stems 2-4 dm. high, velutinous; leaves ascending, 1-3 dm. long, the rachis 

 velutinous; stipules lance-deltoid, attenuate, 5-10 mm. long; leaflets 23-35, lance-elliptic, 

 acute at each end, 1-2 cm. long, silvery; peduncles 1-3 dm. long; racemes 5-6 cm. long, rather 

 dense ; bracts lanceolate, 3-4 mm. long ; pedicels very short ; calyx velutinous, the tube 7-8 mm. 

 long, the teeth subulate, 3 mm. long; corolla purple, 2-2.5 cm. long; wings 15-20 mm. long, 

 the blade lanceolate, acute, with a rather large auricle; keel-petals 12 mm. long, the blade 

 lunate, much shorter than the claw; pod obliquely ovoid, short-pubescent, slightly arcuate, 

 acute, fully 2 cm. long, 6 mm. thick, slightly sulcate on both sides. 



Type locality: Irola, Mexico. 

 Distribution: Mexico and Hidalgo. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 60. 



9. Astragalus pervelutinus Rydberg, sp. nov. 



A cespitose perennial; stems short, usually less than 2 dm. high, densely pubescent with 

 brownish short densely tangled hairs, decumbent below; leaves 1-2 dm. long, ascending; stipules 

 deltoid, acuminate, 8-10 mm. long, densely pubescent; leaflets 17-23, broadly obovate, 1-2 



