292 PROCEEDINGS OF THE AMERICAN ACADEMY. 



leaves opposite, linear to lanceolate, base narrowing somewhat above the 

 expanded often connate portion, rarely denticulate, 2.5 cm. to 7.5 cm. 

 long, .3 cm. to 1.25 cm. wide : inflorescence irregular in form ; glomerules 

 fairly compact, subtending a whorl of leaves which are usually broad and 

 conspicuous: involucral bracts subequal ; head 10- to 13-flowered, sessile, 

 the ray flower has a large oval ligule equalling in length the slender 

 corolla tube : achenes of 9 and of £ about equal, that of the 9 usually 

 stouter : most nearly allied to F. linearis, Lag., from which it differs 

 mainly in the number of flowers in a head, in possessing a whorl of 

 leaves about the glomerules, and in habit ; aud to F. longifolia, Gray, 

 from which it differs in the possession of ligulate flowers, and the whorl 

 of leaves about the glomerule, and in habit. — Florida: Sonibel Is., 

 H. J. Webber, 175, Jan. 1896 (hb. U. S.) ; Manatee, J. H. Simpson, 

 1889 (hb. U. S.) ; Hog Is., S. M. Tracy, 7341, Nov. 1901 (hb. Gr., hb. 

 M. B. G.). 



h- t- Leaves ovate, conspicuously perfoliate. 



15. F. chloraefolia, Gray. Stem glaucous, striate, 3 to 9 dm. 

 high : leaves ovate-oblong to narrowly lanceolate, broadest and connate 

 or connate-perfoliate at base, glabrous, 2.5 to 9 cm. long, 1.2 to 3.5 cm. 

 wide : heads more or less clustered in a broad and open naked peduncu- 

 late compound terminal corymbiform cyme: heads 11- to 13-flowered, 

 involucral bracts 5, the 2 smaller and outer bracts quite distinct; ray 

 flowers 0, disk flowers .6 cm. long;. 2 to 3 small pales on most achenes 

 (4 ace. Gray). — Gray, PI. Fendl. 88 (1849), & Syn. Fl. ii. pt. 2, 353. 

 — Texas: Screw Bean, G. C. Nealley, 688, 1889 (hb. U. S.) ; on the 

 banks of the Rio Grande, Wright, 357 (hb. Gr.) ; below Donana, valley 

 of Rio Grande, Parry, Bigelow, Wright, and Schott, 592 (hb. U. S.). 

 Mexico : Coahuila, Palmer, 682, 1880 (hb. Gr., hb. J. D. S., hb. M. B. G., 

 hb. U. S.), and 2083, 1897 (hb. Gr., hb. J. D. S., hb. M. B. G.). 



Doubtful and Excluded Species. 



F. humillima, Sch. Bip. in Linnaea, xxxiv. 529 (1865-66), with- 

 out description. 



F. spicata, Juss. mss. ace. Smith in Rees, Cyclopedia, xv. Col- 

 lected by Dombey in Peru. Ace. to Hook. f. & Jacks., in Index 

 Keweusis, it is Piqueria artemisioides. 



F. peruviana, Juss. ace. DC. Prod. v. 635, is Piqueria artemisioides. 



F. perfoliata, Klatt, Leopold, xxiii. 146 (1887), is Desmanthodium 

 perfoliatum. 



