388 PROCEEDINGS OF THE AMERICAN ACADEMY. 



o o Scales somewhat corky basally, generally strongly striate; leaves very 

 rarelv lobed; achenes usually larger, G-7 mm. long (except in nos. 12 and 17). 

 + Whole plant densely covered with stalked glands; petioles never auriculate; 

 achene 5.3 mm. long or less. 



12. S. adenophora (Greenm.) Blake, n. comb. P^reet annual, 

 branched above, 1-2.5 m. high, setose and yellowish with dense stalked 

 glands; lower leaves opposite, deltoid-ovate, rarely 3-lobed, acute, 

 truncate or shallowly cordate at base, crenate-dentate, 6.5-12 cm. long, 

 5-13 cm. wide, setose and glandular both sides, on marginless densely 

 glandular petioles 1-8 cm. long, never auriculate, the upper lance- 

 acuminate, gradually reduced to linear-lanceolate bracts; heads 

 panicled, rather numerous, 10-17 mm. high; involucre slightly ex- 

 ceeding disk, 3-rowed, the scales densely glandular-hispid, sul)equal, 

 lanceolate, striate and somewhat corky-ribbed at base, the narrow 

 herbaceous tips loosely spreading; rays when present \^ellow, about 

 12, 7-8 mm. long, 3.5 mm. wide; disk-corollas pubescent, 6 mm. long, 

 yellow turning purplish above, the tube only 0.6 mm. long; pales 9 mm. 

 long, laterally dentate, appressed-pubescent above; achenes blackish, 

 5-5.3 mm. long, 2.9 mm. wide, appressed-pubescent and slightly 

 ciliate, with 2 finely and upwardly pubescent awns 3-4 mm. long. 



EnccUa adenophora Greenm. Proc. Am. Acad, xxxix. 109 (1903). 



Specimens examined: Jalisco: fields and copses. Tequila, Sept.- 

 Oct. 1893, Pri7i gle iG02 (FGN, type collection); Etzatlan, 2 Oct. 

 1903, Hoi way 5092 (G); Morelos: limestone hills near Yautepec, alt. 

 1372 m., 21 Oct. 1902, Pringlc 9898 (FGN); Guerrero: between 

 Tlapa and Tlaliscatilla, ah. i 190-1372 m., 5 Dec. 1894, Nelson 20-io 

 (GN); Oaxaca: Monte Alban, near Oaxaca City, alt. 1677-1830 m., 

 8 Oct. 1894, C. L. Smith 236 (N) ; hills of Soledad de Etla, alt. 1830 m., 

 19 Nov. 1895, L. C. Smith 894 (G); Hacienda Guadalupe, alt. 1600 m., 

 7 Oct. 1906, Conzatti 1529 (F); without definite locality, 10 Nov. 1903, 

 Holwaij 5360 (G). 



4- + Usually less glandular, the glands mostly sessile; petioles sometimes 



auriculate; achene usually 6-7 mm. long. 

 — Lower leaves (at least) not with broadly margined clasping bases; the upper 

 sometimes cordate-clasping. 



A. Achenes 6-7.5 mm. long, or if smaller, the bracts strongly ribbed. 



B. Leaves rather densely glandular-dotted both sides; mature heads 1.5 cm. 



in diameter; achene 7 mm. long; Jamaican. 



13. S. jamaicensis Blake, n. sp., herbacea erecta ramosa 1.3-2.5 m. 

 alta foliis infimis et radice invisis ; caule ramisque multistriatis hirsutis 

 dense glandulosis praecipue in inflorescentia ubi glandulae pedatae 

 sunt ; foliis inferioribus late ovatis crenato-dentatis acutis basi cuneato- 



