APRIL, 1904. PLANTS YUCATAN^ MILLSPAUGH & CHASE. 113 



longer. Corollas whitish, ligules erect or little spreading, narrow, 2 

 mm. long. Receptacle slightly convex; scales linear, upwardly barbed, 

 little shorter than the disk flowers. Achene brown, 1.1x2-2.2 mm. 

 cuneate; in section lozenge-shaped; corky tuberculate rugose ; pappus 

 of 2 erect teeth, . i-. 2 mm. often broken away from the mature achene. 



Hab. "Herb 6 feet high, common in old fields near Izamal, June, " 

 Gaunter ?jo {Eclipta erecta L. Field Col. Mus. Bot. 1:323), "in shady 

 places 10 inches high, Izamal," 1012, Progreso 1162, San Anselmo 

 1203, Chichankanab 1340, 2245, 2306. 



\ 

 SCLEROCARPUS Jacq. Ic. PL Rar., t. 176. 



Heads heterogamous, radiate, rays neutral, ligulate; disk perfect, 

 fertile, or innermost sterile, tubular. Involucre campanulate of few 

 herbaceous bracts. Receptacle convex or conic, chaffy; the scales 

 coriaceous or cartilaginous, closely investing the achene forming a 

 pericarp-like covering, and deciduous with it. Achene subcompressed 

 laterally, obovoid, the hilum above the base; pappus none in our 

 species. Herbs with showy heads of yellow flowers. 



Sclerocarpus divaricatus Benth. and Hook f. in Biol. Cent. Am. 



Bot., 2:164. ' 

 Gymnopsis divaricate Benth. 



An erect, branching herb, with subangled, pubescent stem and 

 branches and alternate, petioled,- ovate, or lanceolate, acute, coarsely 



dentate, strigose-hispid leaves. 

 Inflorescence of solitary, long- 

 peduncled heads, terminal and 

 axillary; peduncles slender, 

 clavate above, striate, densely 

 pubescent. Heads 1.5-2 cm. 

 h'gh, 3-4 cm. broad; ray flow- 

 ers 5 or 6, disk flowers numer- 

 ous. Involucral bracts 5 or 6 in 

 i series, oblong-ovate, subacute, 

 canescent. Corollas yellow, ray 

 with very slender tube, ligule or- 

 bicular, 3 dentate, 10-12 mm. 

 long, spreading; disk corollas 

 hirsute, blackish in the throat, 5 

 cleft. Receptacle conoid; fruc- 

 tiferous scales at maturity 

 2.5-2.7x3-3.5 mm., rhombic ob- 

 ovoid, covered with corky protuberances, sparsely hirsute except at 

 the base (shown magnified 8 diameters in the figure). Achene greenish 

 black, 2.2 X3.4 mm., rounded gourd shape, with maminillate apex; in 

 section elliptical; faintly striate, glabrous, hilum above the base- 

 pappus none. 



Hab. Labcah, July 30, 1865, Schott 67; "herb 3 feet high, abun- 

 dant in old fields near Izamal from July to January," Gaumer 410, 77 1+ 



