108 NORTH AMERICAN FLORA [Volume 34 



2-4 cm. long, sparingly long-hairy; upper leaves narrowly linear; peduncles 3-10 cm. long; 

 involucre 5 mm. high, 5-7 mm. broad, silky- villous; bracts oblong; ligules 5-6 mm. long, 3 

 mm. wide; disk-corollas 2 mm. long; achenes 2 mm. long, densely hairy; squamellae lanceolate 

 or ovate, 1 mm. long, excluding the awn produced by the excurrent midrib. 



Type locality: San Felipe, Texas. 



Distribution: Oklahoma, Texas. Coahuila, and Nuevo Leon. 



Illustrations: Hook. Ic. pi. 146; Britt. & Brown, 111. Fl. /. 3968; ed. 2./. 4537. 



24. Tetraneuris latior (Cockerell) Rydberg, sp. nov. 



Telraneuris Unearifolia latior Cockerell, Proc. Biol. Soc. Wash. 17: 111. 1904. 



A branched annual, with a tap-root; stem 2-3 dm. high, leafy, sparingly long-hairy or gla- 

 brate; leaves, all except the uppermost, linear-oblanceolate or oblanceolate, 3-6 cm. long, 2-6 

 mm. wide; peduncles 5-15 cm. long; involucre 6 mm. high, 10 mm. broad, silky- villous; ligules 

 8-10 mm. long, about 4 mm. wide; disk-corollas 3 mm. long; achenes 3 mm. long, densely 

 hirsute; squamellae ovate; midvein excurrent into a short awn. 



Type locality: Kerrville, Texas. 

 Distribution: Texas to Nuevo Leon. 



25. Tetraneuris oblongifolia Greene, Pittonia 3: 269. 1898. 



Telraneuris Unearifolia oblongifolia Cockerell, Proc. Biol. Soc. Wash. 17: 112. 1904. 



A biennial or perhaps even a perennial, with a tap-root; stem 3 dm. high, simple at the 

 base, often branched above; basal leaves clustered, oblanceolate, 3-6 cm. long, 4-6 mm. wide, 

 copiously covered by long brownish hairs; stem-leaves linear, 1-2 mm. wide; peduncles 5-12 

 cm. long; involucre 4-5 mm. high, 6-10 mm. broad; ligules 8-9 mm. long, about 4 mm. 

 wide; disk-corollas 2.5 mm. long, glandular-puberulent ; achenes 2 mm. long, densely silky; 

 squamellae 1.5 mm. long, ovate, acuminate into a short awn-point. 



Type locality: Guajuco, Nuevo Leon. 

 Distribution: Texas and New Mexico to Nuevo Leon. 



26. Tetraneuris Dodgei (Cockerell) Rydberg, sp. nov. 



Tetraneuris Unearifolia Dodgei Cockerell, Proc. Biol. Soc. Wash. 17: 112. 1904. 



A caulescent biennial, with a tap-root; stem 2-3 dm. high, sparingly long-villous, simple 

 below, branched above; basal leaves clustered, narrowly oblanceolate, some of them usually 

 lobed, 3-5 cm. long, 2-4 mm. wide, conspicuously long-hairy; stem-leaves narrowly linear, 

 1-2 mm. wide; peduncles 5-10 cm. long; involucre about 5 mm. high and 10 mm. broad, villous; 

 bracts oblong, obtuse; ligules about 8 mm. long and 4 mm. wide; disk-corollas 3 mm. long; 

 achenes 2 mm. long, densely hirsute; squamellae obovate, the body 1 mm. long, the midrib 

 excurrent into an awn fully as long. 



Type locality: Monterey, Nuevo Leon. 

 Distribution: Texas to Nuevo Leon. 



Doubtful species 



Actinella glabra Nutt. Trans. Am. Phil Soc. II. 7: 379. 1841. This was described 

 as a perennial having stem-leaves, and should therefore be related to T. argentea and T. lepto- 

 clada, but none of this group has been collected anywhere near the type locality of A. glabra 

 in eastern Kansas. 



61. RYDBERGIA Greene, Pittonia 3: 270. 1898. 



Stout caulescent perennials with tap-roots. Leaves alternate, once or twice ternately or 

 quinately divided into linear divisions or some of them entire. Heads radiate, solitary, 

 terminating the branches. Involucre depressed-hemispheric or nearly rotate; bracts in 

 about 3 series, linear, distinct, subequal or the inner shorter densely woolly. Receptacle 

 convex or hemispheric, naked. Ray-flowers 15-30, pistillate, fertile; ligules yellow, elongate. 



