APRIL, 1904. PLANTS YUCATAN^E MILLSPAUGH & CHASE. 147 



Hab. "Herb, 4 feet high, common," Buena Vista Xbac, Gaunter 

 1438, Pocoboch, 2394. 



SENECIO L. Sp. PL, 866. 



Heads heterogamous, radiate (in our species), rays pistillate, 

 fertile, ligulate; disk flowers perfect, fertile, tubular. Involucre 

 cylindric or campanulate, of equal herbaceous bracts in i series, dis- 

 tinct or united at the base, usually with a series of loose accessory 

 bracts. Receptacle plane, naked. Achene subterete, 5-10 ribbed; 

 pappus of numerous white capillary bristles. Herbs or shrubs usually 

 with showy heads of yellow flowers. 



Senecio Berlandieri (DC.) Hemsl. Biol. Cent. Am., Bot. 2:236. 

 Gynoxis Berlandieri DC. 

 A woody climber with striate, glabrous stem and branches, and 



alternate, petioled, ovate, acuminate; "remote, exserted-denticulate," 



glabrous leaves. Inflorescence 

 of small corymbs terminating 

 the numerous short branches; 

 peduncles striate, glandular- 

 puberulent. Heads 12-15 mm - 

 high, 4.5-5 cm. broad, ray flow- 

 ers 12-20, disk flowers numer- 

 ous. Involucre broad turbinate, 

 bracts linear, acute, spreading 

 at maturity; accessory bracts 

 numerous, linear, glandular-pu- 

 berulent. Corollas orange yel- 

 low, rays with slender tube, 



ligule oblong, 2-4 toothed, 1.5- 

 1.8 mm. long, spreading; disk 

 corollas with 5-cleft campanulate 

 limb and conspicuously elongated 

 style branches. Receptacle alveolate. Achene light brown, .8x3.5 

 mm., oblong-ellipsoid; in section orbicular-oval in outline; 10 ribbed, 

 hirtellous; pappus shining white, 8-10 mm. long. 



Hab. "A climber among mimosa trees near Sisal," Schott 



CARDUUS L. Sp. PL, 820. 



Heads homogamous, flowers perfect, fertile, tubular. Involucre 

 ovoid or globose, of spiny or prickly tipped bracts imbricated in 

 several series, appressed at the base. Receptacle plane or convex, 

 densely villous-setose. Achene laterally subcompressed, hard; pappus 

 of several series of slender plumose or simple bristles connate at the 

 base. Biennial or perennial herbs with spiny or prickly foliage and 

 large heads of usually purple or white flowers. 



Carduus Mexicanus (DC.) Moric. ex DC. Prod., 6:637. 

 Cirsium Mexicanum DC. 

 A tall herb, with striate-sulcate stem and branches, white arach- 



