128 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



wide, usually somewhat involute at the sides, the ventral angle corky 

 ridged; pappus of minute, laciniate scales forming a crown 5 mm. 

 high; inner achenes 3 sided, smooth, narrowly winged; or innermost 

 brown, 4 sided, cuneate, wingless and corky-r.uberculate, hirtellous, 

 neck and pappus as in the outer achenes. 



Hab. Tekanto, Feb. 27, Stone 191; "herb, 3 feet high, abundant 

 in old fields near Izamal, Sept. to Nov." Gaumer 4iob (Wedelia 

 hispida Field Col. Mus. Bot. i :326), 826 (type) (Zexmenia hispida 

 Ibid.), 2501, San Anselmo 2005. 



Called by the Mayas ZAHUM, meaning an herb to fatten cattle. 



Zexmenia Costaricensis Benth. ex Oerst. in Kjoeb. Vidensk. 

 Meddel., 95. 



A slender stemmed, more or less climbing or reclining shrub, with 

 ashy bark bearing prominent lenticels, divaricate branches, and oppo- 

 site, short-petioled, ovate-lan- 

 ceolate, acuminate, serrate, his- 

 pid leaves. Inflorescence of 

 umbellate-cymes of 3-15 heads, 

 terminating the branches; pe- 

 duncles slender, subflexuous, be- 

 coming rigid, puberulent. Heads 

 8-10 mm. high, 3-3.2 cm. broad, 

 ray flowers 8-15, disk flowers 

 numerous. Involucral bracts in 

 2 series, appressed, oblong, ab- 

 ruptly acute, the outer longer, 

 puberulent, ciliate. ' Corollas 

 bright lemon yellow, ray flowers 

 with short tubes, ligules elliptic 

 oblong, obtuse, 10-12 mm. long, 

 spreading; disk corollas nerved, 

 5 lobed. Receptacle convex; scales acuminate, rigid. Achenes fus- 

 cous, narrowly cuneate: of ray flowers 1.2x5-5.2 mm.; in section 

 sharply 3 angled, the dorsum plane, lateral facets concave; hispidulous 

 on the angles above; awns 3, 1.5-3 mm.; the ventral longest; disk 

 achenes 1.7x5.7 mm.; in section compressed lozenge-shaped; hispid- 

 ulous on the angles, at least the ventral; awns 2, 3.5-4 mm. long. 



Hab. Between Guayalceh and Yumuo, Oct. 2, 1865, Schott 914; 

 "a shrubby climber, 20 feet high, on an artificial mound 8 miles 

 southwest of Izamal, Nov.," Gaumer p6o, 962, Chichankanab 2344, 

 Calotmul 2350. 



Called by the Mayas ZACTAH, "A loom," the woody stems having 

 been used by the ancients as a part of their weaving frames. 



VERBESINA L. Sp. PI., 901. 



Heads heterogamous, radiate, ray flowers pistillate, fertile (or 

 achenes abortive) ; ligulate disk flowers perfect, fertile, tubular. 

 Involucre short campanulate of subherbaceous bracts imbricated in 

 few series, the outer shorter. Receptacle convex or conic, chaffy; 



