104 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



Nocca mollis (Cav.) Jacq. Frag., 58 t. 85. 



Lagasca mollis Cav. 



An ascending, usually diffusely branched annual, with striate 

 softly pubescent stem and branches and opposite (or uppermost alter- 

 nate) petioled, ovate, crenate-dentate, softly pubescent leaves, paler 

 beneath. Inflorescence of termi- 

 nal and axillary, solitary, long pe- 

 duncled, subglobose glomerules, of 

 20-30 heads, subtended by 4-6 ovate, 

 leaf-like bracts. Heads 7 mm. high, 



2 mm. broad. Involucre closely 

 investing the achene, 4-6 (usually 5) 

 cleft, verrucose-striate, densely 

 pubescent with white hairs, the 

 hairs tufted on the verrucse. Cor- 

 olla white, tube short, limb elon- 

 gated, lobes 5, pubescent. Achene 

 dull black, 1.25x3 mm., cuneate, 

 rounded at the summit; in section 

 biconvex; about 12 nerved, minute- 

 ly reticulated, pubescent around the apex with reflexed hairs; pappus 

 reduced to a crown of white hairs. 



Hab. Waste lands near Merida, Valdez 29 (Lagascea mollis Cav. 

 Field Col. Mus. Bot. 1:324); common on open grounds near Izamal, 

 July to March, Gaunter 489, 318 (Tithonia tubaformis Ibid. 1:325), 

 Chichankanab 1802; forests of Xkombec, April 5, 1903, Case, et Ed. 

 Seler 4024. 



ELVIRA Cass. Diet. Sc. Nat, 30:67. 



Heads heterogamous, in our species 2 flowered, i pistillate, fertile, 

 ligulate; i perfect, sterile, tubular. Involucre piano-compressed, of 



3 thin herbaceous bracts laid face to face. Receptacle naked, minute. 



Achene dorsally compressed, 4 

 angled; pappus none. Annual 

 herbs with inconspicuous, fasci- 

 cled heads. 



Elvira biflora (L.) DC. Prod., 



5:5 3- 



Milleria biflora L. 

 An erect annual with angled, 

 strigose stem and branches, and 

 opposite, petioled, lanceolate- 

 ovate, acuminate, serrate, 3 

 nerved, hirsute leaves, paler be- 

 neath. Inflorescence of terminal 

 and axillary pedunculate fasci- 

 cles of 10-12 heads, subtended 

 by a pair of leaves. Heads 5-6 mm. high, 5 mm. broad, on slender 

 pubescent pedicels, or subsessile, 2 flowered. Involucral bracts veiny, 



