Part 3, 1923] FABACEAE: INDIGOFEREAE 143 



9. Indigofera leptosepala Nutt; T. & G Fl. N Am. 



1:298. 1838. 



Indigofera cinerea Buckl. Proc. Acad. Phila. 1861: 451. 1861. Not /. cinerea Willd. 1803. 

 Indigofera texana Buckl. Proc. Acad. Phila. 1861: 451. 1861. 



A perennial, with a thick woody root and short caudex; stems several, decumbent or pro- 

 cumbent, woody at the base, 3-10 dm. long, sparingly strigose; stipules subulate, about 5 

 mm. long; leaves spreading, 2-5 cm. long; rachis and petiole strigose; leaflets 5-9, oblanceo- 

 late and obtuse, or those of the earlier leaves sometimes 3, cuneate and rounded, truncate, 

 or even slightly retuse, often mucronate at the apex, cuneate and subsessile at the base, 

 equally strigose on both sides, 1-3 cm. long, 3-10 mm. wide; racemes lax, 5-15 cm., or in 

 fruit even 20 cm. long, 6-15-flowered, bracts shorter than the calyx, subulate, caducous; 

 calyx strigose, 8 mm. long; corolla pink, 10-11 mm. long; pod 2-3 cm. long, about 3 mm. broad, 

 strigose, 6-9-seeded; seeds 2-2.5 mm. long, 1.5 mm. thick, light-brown. 



Type locality: Plains of Arkansas. 



Distribution: Georgia and northern Florida to Kansas, Coahuila, and Tamaulipas. 



Illustrations: Britt. & Brown, 111. Fl./. 2116; ed 2,/. 2520. 



10. Indigofera nana Rydberg, sp. nov. 



A dwarf perennial, with a thick root; stems numerous, 1 dm. high or less, canescent; 

 stipules subulate-setaceous, 4-5 mm. long; leaves spreading, 1-2 cm. long; rachis and petiole 

 strigose; leaflets 7-11, cuneate or oblanceolate, rounded or obtuse at the apex, tapering 

 at the base, 5-10 mm. long, canescent; racemes 3-4 cm. long, rather dense; bracts lance- 

 subulate; calyx strigose; corolla pink. 8-9 mm. long; pod 2.5-3 cm. long, 3 mm. thick, rather 

 abruptly acute, 10-12-seeded; seeds 2-2.5 mm. long, 1.5 mm. thick. 



Type collected at Sunguato, near Morelia. Michoacan, June 24, 1910, Fr. Arsene (herb. N. Y. 

 Bot. Card.). 



Distribution: Michoacan and Puebla. 



11 Indigofera argentata Rydberg 



Indigofera leptosepala var. A. Gray, PI. Wright. 1: 45. 1852. 



A perennial, with a woody root and short caudex; steme rect or nearly so, about 3 dm. 

 high, branched, more or less white-strigose; stipules subulate, 5 mm. long; leaves spreading, 

 2-4 cm. long; rachis and the short petiole densely and loosely strigose; leaflets 5-9, linear- 

 oblong to oblanceolate, 1-2 cm. long, 3-4 mm. wide, obtuse or rounded and mucronate at the 

 apex, densely white-strigose on both sides; racemes 1-2 dm. long; bracts lance-subulate, 

 acuminate. 2-3 mm. long caducous; calyx strigose, 3.5-4 mm. long; corolla 6-7 mm. long; 

 pod 15-23 mm. long, 2.5-3 mm. thick, densely white-strigose, 5-6 -seeded. 



Type collected at Sabinas, Coahuila, May 21, 1902, E. W. Nelson 6833 (U. S. Nat. Herb. no. 

 347450). 



Distribution: Coahuila and western Texas. 



12. Indigofera brevipes (S. Wats.) Rydberg, sp. nov 



Indigofera leptosepala brevipes S. Wats. Proc. Am. Acad. 17: 342. 1882. 



A perennial, with a thick root; stems several, branched, 1-3 dm. long, ascending or pro- 

 cumbent, strigose; stipules subulate, 2-3 mm. long; leaves spreading, 2-4 cm. long; rachis 

 and petiole strigose; leaflets 4-7, grayish-strigose on both sides, those of the lower leaves 

 obovate or cuneate, obtuse or rounded at the apex, 0.5-1 cm. long, those of the later leaves 

 oblanceolate and obtuse or acutish, 1-1.5 cm., rarely 2 cm. long; peduncles 1-2 cm. long, not 

 exceeding the leaves; racemes few-flowered, dense and short; bracts subulate; corolla pinkish, 

 7-S mm. long; pod 2-2.5 cm. long, 2 mm. thick, often somewhat curved, abruptly acute at 

 the apex, 6-8-seeded; seeds 1.5 mm. long, 1 mm. thick Perhaps grading into /. miniata. 



Type locality: San Rafael Mountains. San Luis Potosi. 



Distribution: Southern Texas to Chihuahua, Durango, San Luis Putosi, and Tamaulipas 



