OF ARTS AND SCIENCES. 



141 



3-wingcd, the two outer wings narrow, the inner broader, produced 

 above and adnate to tlie awn of the ])appus ; disk-achenes compressed, 

 simihirly winged on one edge, scarcely at all on the other, the pappus 

 reduced to the two very unequal processes at the angles : appendages 

 of the style-branches acuminate. — Barranca near Guadalajara ; Oc- 

 tober, 1889 (n. 2999.) 



SqiLANTiiES BoTTKKii. Annual, branching, about a foot high, spar- 

 ingly pubescent or glabrate : leaves ovate to oblong-ovate, cuneate at 

 base and shortly petiolate, acute or shortly acuminate, 1 or 2 inches 

 long : peduncles slender, mostly equalling or somewhat exceeding the 

 leaves, nearly glabrous : heads ovate-conical, 3 to 5 lines long, dis- 

 coid, the glabrous narrowly oblanceolate involucral scales 2 or 3 lines 

 long: achenes ciliate, the sides nearly glabrous, striate; pappus of 

 two slender bristles. — Near Guadalajara; November, 1889 (n. 2946); 

 also collected in Orizaba by Botteri (n. 825 in Herb. Gray). 



Salmea Palmeri, Stem erect, rather stout, 3 to 5 feet high or 

 more, branching, glabrous or slightly pubescent above : leaves subcori- 

 aceous, opposite, very shortly petiolate, ovate to ovate-lanceolate, acute 

 or acuminate, rounded at base, distantly glandular-serrate or serrulate, 

 strongly veined and slightly pubescent, scabrous on the margin, 2 to 4 

 inches long : heads 2 to 5 lines high, i'ew to many, closely corymbose ; 

 scales acute, finely pubescent above, as also the chaff of the recepta- 

 cle : corolla-tube as long as the throat, the limb deeply cleft : achenes 

 compressed or more or less acutely 3-4-angled, short-ciliate on the 

 angles, the sides nearly glabrous ; pappus of two nearly equal atten- 

 uate bristle-like palea3, or of three or four more unequal ones. — 

 Near Guadalajara; n. 528 Palmer and n. 2345 Pringle (1889), both 

 distributed through some inadvertence as S. grandiceps, Cass., to 

 which they have little resemblance; also Pringle's n. 2155 and 2170 

 of 1889. 



Dahlia dissecta. Stems slender, lax, ascending from a decum- 

 bent or procumbent woody base, 1| to 2 feet high, glabrous through- 

 out : leaves deltoid in outline, 3 to 6 inches long, twice or sometimes 

 thrice pinnate, the lanceolate to linear segments mostly laciniately 

 lobed : heads long-pedunculate ; outer involucral scales suborbicular, 

 3 lines long, the inner narrowly oblong, 6 to 8 lines long ; rays pur- 

 ple or "mauve-colored," 1 to 1| inches long : achenes linear-oblanceo- 

 late, truncate, I lines long, nerved and with a strong central ridge on 

 both sides, somewhat minutely pubescent on the inner surface, — On 

 limestone ledges at San Jose Pass, San Luis Potosi ; July, 1890 

 (n. 3167). 



