272 PROCEEDINGS OF THE AMERICAN ACADEMY 



oblanceolate, not tomentose, an inch long : lower bracts as large, simi- 

 lar: tube of involucre a line long, tlie very divergent alternate teeth 

 as long or longer : flowers white or pinkish, villous ; segments recurved, 

 somewhat undulate, oblong-ovate, crenate, acutisli, the inner narrower, 

 scarcely shorter : stamens 9. — Common on gravelly mesas near Crof- 

 ton, San Bernardino County; Dr. C. C. Parry, 1876. 



18. C. Xanti. Small, villous-pubescent and tomentose : the leaves 

 ovate-oblong, 2 to 6 lines long, tomentose beneath : lower bracts simi- 

 lar or linear-oblanceol ale : involucres tomentose, in diffuse cymes, the 

 tube 2 lines long ; teeth very divergent, often half as long or more, the 

 alternate ones much smaller : flowers rose-colored, 2^ lines long, vil- 

 lous ; segments linear-oblong, entire, acutish, the inner a half shorter : 

 stamens 6 (rarely 7 or 8.) — C. procumbens, Gray, Proc. Bost. Soc. 

 vii. 148; referred to C staticoides, in Torr. & Gray, Rev. 195. Near 

 Fort Tejon (C. L. Xantus, Dr. Horn) ; San Bernardino and San Gor- 

 gonio, on sandy washes, Dr. C. C. Parry. 



19. C. Wheeleri. Small, villous-pubescent and tomentose : leaves 

 and bracts tomentose beneath, the latter oblanceolate, an inch long or 

 less : involucres in small cymes, nearly glabrous, a line long, with short 

 stout teeth, the alternate ones smaller: flowers rose-colored, \\ lines, 

 long, glabrous ; segments broadly oblong, the inner slightly shorter and 

 broader : stamens 6. — Near Santa Barbara ; Dr. J. T. Rothrock, on 

 Lieut, G. M. Wheeler's Geogr. Survey, 1876. 



20. C. UNiARiSTATA, Torr. & Gray. Villous-pubescent : leaves 

 and bracts spatulate or oblanceolate : involucres numerous, scattered ; 

 one tooth with a long straight awn, the rest short and uncinate: 

 flowers yellowish, \\ lines long; segments very unequal, the outer 

 obovate, entire, the inner oblong, crenate: stamens 3 or 9. — S. Cali- 

 fornia; near New Idria (Prof. Brewer), and on the Ui^per Salinas, Dr. 

 Palmer. 



21. C. BREVICORNU, Torr. Pulverulent or nearly glabrous, erect 

 or ascending, very fragile at the tumid nodes : leaves and bracts broadly 

 spatulate to linear-oblanceolate : involucres scattered, narrow ; teeth 

 very short, uncinate: flowers included; segments narrowly oblong, 

 nearly equal : stamens 3 or 6. — N. W. Nevada to S. E. California 

 and S. Utah.* 



§ 3. Villous-pubescent and tomentose, low, branching and fruiting from the 

 base : bracts 2 or 3, distinct : involucres scattered, coriaceous, 1-flowered, 

 unequally 3-5-tootlied or -lobed, triangular or C3'iindrical, transversely cor- 

 rugated : flowers tubular, shortly and equally 6-cleft, glabrous : stamens G or 9, 

 short, on the throat. — Acanthogonum, Torr. & Gray. 



