APRIL, 1904. PLANTS YUCATAN^: MILLSPAUGH & CHASE. 133 



Hab. Merida, Dec., 1864, Schott 145; Tunkas, March 3, 1890 

 Stone 2400, (in Herb. Acad. Sci., Phil.); "ascending among shrubbery 

 like a vine, producing its orange-yellow flowers in October, Izamal, 

 Gaiimer 951, San Anselmo 2oj, Chichankanab 2084, Field Col. Mus. 

 Cat. No. 57998. 



COSMOS Cav. Ic., 1:9, t. 14, 79. 



Heads heterogamous, radiate; ray flowers neutral, ligulate; disk 

 flowers perfect, fertile, tubular. Involucre subhemispheric, of mem- 

 branaceous bracts imbricated in 2 series, connate at the base. 

 Receptacle plane, chaffy; scales plane or concave, subtending the 

 disk flowers. Achene 4-5 angled, little or not at all compressed, 

 narrow, apex attenuate in a long slender beak or rarely nearly beak- 

 less; pappus of 2-4 persistent awns. Herbs with large and showy 

 heads of rose color or purple rays (or yellow in one species). 



Cosmos caudatus H. B. K. Nov. Gen. et Sp., 4:240. 



A tall, branching, annual, with glabrate or sparsely hirsute, terete, 

 striate stem and opposite, ciliate-petioled, twice-pinnatifid leaves, the 

 segments lanceolate, acuminate, margins entire and scabrate. Inflor- 

 escence of solitary, terminal and axillary, long-peduncled heads, 

 peduncles striate, glabrous or sparsely hirsute. Heads (in flower) 

 9-10 mm. high, 3-3.5 cm. broad; ray flowers about 8, disk flowers 

 numerous. Involucre sparsely pubescent at the base, the outer bracts 



herbaceous, shorter, linear-lance- 

 olate, acute, ciliolate, loose and 

 spreading; inner membrana-, 

 ceous, pale-margined, lanceolate, 

 subacute, at first erect, some- 

 what spreading at maturity. Ray 

 corollas rose-purple, tube short, 

 ligule oblong, 3 dentate, 12 mm. 

 long, spreading; disk corollas 

 yellow, 5 lobed. Receptacle 

 plane; scales lanceolate, acute, 

 glabrous, as long as the disk 

 flowers. Achenes dark brown, 

 1.5-1.6x15-29 mm., fusiform, 

 tapering into a slender beak, 

 much elongated in the inner 

 achenes, erector slightly curved; 

 in section 4 lobed; scabrate, the beak strongly so; awns 2, slender, 

 deflexed, retrorsely barbed, 3 mm. long. 



Hab. "Herb, 4 feet high, uncommon at Izamal," Gaunter 940, 

 Chichankanab 2075, near Merida 2505, Calotmul, Field Col. Mus. Cat. 

 No. 58001. 



Called CHACXUL, "Redtop," by the Mayas, and ESTRELLA DE 

 MAR, "star of the sea," in Yucatec. 



