140 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



Izamal, Oct. to Nov.," Gaumer 476, abundant at Tekax, Sept., 1129, 

 Pocoboch Field Col. Mus. Cat. No. 57892. 



The heads of the specimens from Tekax {Gaumer 1129) are all 

 "doubled"; that is, all flowers of the head are pistillate and ligulate, 

 fertile. 



Called "Xptmuc," by the Mayas. "MACENAL PUJUC" and 

 "XPUHUC DE MONTE" are local names, a combination of Spanish and 

 Maya. The Maya name indicates that the flowers are supposed to 

 resemble a woman with her skirts tucked up. 



DYSODIA Cav. Anal. Cienc. Nat., 6:334. 



Heads heterogamous, radiate, ray flowers pistillate, fertile, ligu- 

 late; disk flowers perfect, fertile, tubular. Involucre campanulate of 

 subequal, rigid-membranaceous, bracts in i series, partially connate, 

 usually with a series of loose accessory bracts. Receptacle subplane, 

 naked, short nmbrillate. Achene subcompressed dorsally, finely many 

 striate; pappus of 10 rigid scales, each resolved into several unequal 

 bristles, and (in our species) an outer series of 10 small oblong scales. 

 Herbs or shrubby plants, fetid or strong scented. 



Dysodia cancellata (Cass.) Gray Proc. Am. Acad., 19:38. 



Lebetina cancellata Cass. 



An erect, glabrous, branching, perennial, with ribbed stems and 

 branches, and alternate, sessile, pinnately-lobed and incised leaves bear- 

 ing prominent oil glands. Inflorescence of solitary heads terminating 

 the strict branches, peduncles' ribbed, bracteolate. Heads 14-15 mm. 

 high, nearly as broad or in fruit broader, ray flowers 9-15, disk 

 flowers numerous. Involucre with a series of loose accessory bracts, 

 pectinately setiferous; involucral 

 bracts connate one-half their 

 length, bearing below the acute 

 tip a small spinescent^ keel en- 

 closing an oblong oil gland, a 

 pair of similar glands on each 

 bract at about the point of sepa- 

 ration. Ray corollas deep orange, 

 tube long, slender, ligule oval, 

 entire, 5 mm. long, erect or as- 

 cending; disk corollas cylindri- 

 cal, 5 lobed. Receptacle convex, 

 becoming short conoid. Achene 

 grayish brown, .7 x 4. 3 mm., lin- 

 ear-obconic ; in section elliptic 

 in outline, obscurely 5 sided; 

 faintly many striate, sparingly 

 hispidulous or glabrous; pappus double, outer series of 10 membran- 

 aceous, elliptic, minutely fimbriate scales, 1-1.2 mm.; inner of 10 

 scales resolved into 7-10 scabrous unequal bristles 2-7 mm. long. 



Hab. Merida, Dec. 4, 1864, Schott 78; "herb 3 feet high, com- 



