t 



APRIL, 1904. PLANTS YUCATAN^: MILLSPAUGH & CHASE. 129 



scales complicate, embracing the achene, persistent on the receptacle. 

 Achene laterally compressed, margins winged; pappus of 2 slender, 

 rigid awns, persistent in our species. Herbs or small shrubs. 



Verbesina gigantea Jacq. Ic. PI. Rar., 1:17, t. 175. 



A simple shrub with glabrate stem and large, alternate, wing- 

 petioled, pinnately parted leaves, sparsely pubescent above, whitish 



tomentose beneath. Inflorescence 

 a broad, compound, terminal, bract- 

 eate corymb, branchlets glabrate 

 below, tomentulose toward the sum- 

 mit; peduncles hirsute-tomentulose. 

 Heads 9 mm. high, 6 mm. broad,, 

 ray flowers 4-7, disk flowers about 

 20. Involucral bracts in 2-3 series, 

 narrowly lanceolate, acute, pubes- 

 cent, ciliolate, the outer shorter. 

 Ray flowers inconspicuous, white, 

 erect or spreading; corollas of disk 

 flowers 5 lobed. Receptacle min- 

 ute, convex; scales rigid, abruptly 

 acuminate, pubescent at the sum- 

 mit, as long as the disk flowers. 

 Achene fuscous, 1.5x4-4.2 mm., 

 narrowly obovate, long attenuate to the base ; in section compressed 

 lozenge-shaped ; pubescent except the attenuate base, margins un- 

 equally winged, wings .2-. 8 mm. (usually .2-. 5 mm. in our speci- 

 mens) more or less ciliate; awns unequal, slender, erect hispid, 

 2.5-2.8 mm. long. 



Hab. Tizimin, March 28, 1866, Schott sine num. (Montanoa gramli- 

 flora? Field Col. Mus. Bot. 1:395); "common in waste lands and 

 roadsides, 8 feet high, November," Gaumer 1143, Calotmul 2201. 



UCACOU Adans. Fam., 2:131. 



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

 late; disk flowers perfect, fertile, tubular. Involucre ovoid or oblong, 

 of few subequal bracts, the outer i or 2 often foliaceous, inner dry. 

 Receptacle minute, chaffy; scales membranaceous-scarious, plane, 

 subtending the d-isk flowers. Achenes dorsally compressed, dimor- 

 phous, those of the rays lacerate winged on the margins, the wings at 

 the summit united with the stout pair of awns which form the pappus; 

 achenes of disk flowers wingless, pappus of 2 or 3 rigid more slender 

 awns, connate at the base. Annual herbs with inconspicuous heads 

 clustered in the axils. 



Ucacou nodiflorum (L.) Hitchc. Fl. Baham., 100. 



Verbesina nodiflora L. 



An erect, branching herb, with strigose-hispid stem and branches, 

 and opposite, wing-petioled, oblong-lanceolate or lanceolate-ovate, 

 serrate, strigose-hispid leaves. Inflorescence of clusters of i-several 



