Part 2, 1915] CARDUACEAE : HELENIEAE 107 



19. Tetraneuris argentea (A. Gray) Greene, Pittonia 3: 269. 1898. 



Actinella argenlea A. Gray, Mem. Am. Acad. II. 4: 100. 1849. 

 Ptilepida argentea A. Heller, PI. World 1: 22. 1897. 



A caulescent cespitose perennial, with a short caudex; stem 1-2 dm. high, densely silky; 



basal leaves linear-oblanceolate or oblanceolate, 3-10 cm. long, 3-10 mm. wide, silvery-silky; 



stem-leaves 3-10, linear or linear-oblanceolate; peduncles 2-10 cm. long; involucre 6-7 mm. 



high, 10-12 mm. broad, silky; bracts elliptic, acute; ligules about 10 mm. long, 5-6 mm. wide; 



disk-corollas 4 mm. long; achenes 3 mm. long, densely hirsute; squamellae 3 mm. long, ovate, 



abruptly acuminate into a short awn. 



Type locality: Santa Fe, New Mexico. 

 Distribution: New Mexico. 



20. Tetraneuris formosa Greene; Wooton & Standley, Contr. 

 U. S. Nat. Herb. 16: 192. 1913. 



A caulescent cespitose perennial, with a short woody caudex, not conspicuously long- 

 hairy; stem about 2 dm. high, loosely pubescent; basal leaves spatulate, 4-6 cm. long, 5-9 mm. 

 wide, obtuse, green, sparingly pilose on both sides, punctate; stem-leaves 3-5, linear-oblanceo- 

 late; involucre 7-8 mm. high, about 12 mm. broad; bracts oblong, obtuse, densely silky- 

 villous; ligules fully 15 mm. long, 7-8 mm. wide, conspicuously 4-5-veined; disk-corollas 

 4 mm. long; achenes densely hirsute, 3 mm. long; squamellae fully 2 mm. long, ovate, abruptly 

 acuminate. 



Type locality: Hills near Kingston, Sierra County, New Mexico. 

 Distribution: New Mexico. 



21. Tetraneuris leptoclada (A. Grav) Greene, Pittonia 

 3: 269. 1898. 



Actinella leptoclada A. Gray, in Torr. Pacif. R. R. Rep. 4: 107. 1857. 

 Tetraneuris mancosensis A. Nelson. Bot. Gaz. 28: 129. 1899. 

 Tetraneuris intermedia Greene, PI. Baker. 3: 29. 1901. 



A caulescent cespitose perennial, with a thick woody caudex, with dense tufts of long hairs; 

 stem 2-3 dm. high, sparingly hairy or glabrate, glandular-granuliferous; basal leaves oblance- 

 olate or linear-oblanceolate, 6-10 cm. long, 2-7 mm. wide, sparingly hairy or glabrate, con- 

 spicuously punctate; involucre about 7 mm. high, 10-12 mm. broad, villous; bracts elliptic; 

 ligules 8-10 mm. long, 3-5 mm. wide; disk-corollas 4 mm. long; achenes 3 mm. long, densely 

 hirsute; squamellae fully 3 mm. long, lanceolate, acuminate into a short awn. 



Type locality: Santa Antonita, New Mexico. 

 Distribution: Colorado and New Mexico. 



22. Tetraneuris Ivesiana Greene, Pittonia 3 : 269. 1898. 



A caulescent cespitose perennial, with a woody caudex, long-hairy on the leaf-bases; stems 



1-3 dm. high, sparingly pubescent; leaves all narrowly linear or lance-linear, 5-10 cm. long, 



1-4 mm. wide, erect; peduncles 3-10 cm. long; involucre somewhat turbinate, 5-6 mm. high, 



7-8 mm. broad, silky-villous; bracts elliptic, obtuse; ligules about 10 mm. long, 4-6 mm. 



wide, strongly veined; disk-corollas 4 mm. long; achenes 3 mm. long, densely hirsute; squamellae 



lanceolate, acuminate into an awn, together with this 4 mm. long. 



Type locality': Rio Zufii [Arizona]. 



Distribution: Southern Utah, Arizona, and New Mexico. 



23. Tetraneuris linearifolia (Hook.) Greene, Pittonia 3: 269. 



1898. 



Hymenoxys linearifolia Hook. Ic. pi. 146. 1837. 

 Actinella linearifolia T. & G. Fl. N. Am. 2: 383. 1842. 

 Ptilepida linearifolia Britton, Mem. Torrey Club 5: 340. 1894. 

 Picradenia linearifolia Britton; Britt. & Brown, 111. Fl. 3: 448. 1898. 



A slender and branched annual, with a tap-root, in Mexico perhaps becoming peren- 

 nial; stem sparingly long-hairy, 2-3 dm. high; lower leaves linear-oblanceolate, short-petioled, 



