180 PROCEEDINGS OF THE AMERICAN ACADEMY 



cies stands near P. rigida, Gray, but differs from it in its more 

 numerously flowered heads, in the character of the involucre, and 

 somewhat in the shape of the leaves. The heads, however, are not 

 so large as in P. formosa, Gray, and P. turbinata, Llav. & Lex., 

 nor do the involucral bracts extend down upon the peduncles as in 

 these species. 



Androsace (?) cinerascens. A spreading perennial of grayish 

 green color, 6-10 inches in height, a little woody at the base : stems 

 ascending, several times branched, very leafy: leaves narrowly 

 linear, acute, sessile, perhaps slightly fleshy, 1-1| inches long, £-§ 

 of a line broad : peduncles slender, smooth, 3-4 inches long, bear- 

 ing 4-8 corymbosely grouped flowers; pedicels ebracteolate, fili- 

 form, 6-8 lines long : the short calyx tube hemispherical ; segments 

 lanceolate, acuminate, corolla small, salver-shaped, 2 lines long, 

 white or nearly so : capsule enclosed by the persistent calyx, dehis- 

 cent by 5 valves: placenta spherical, raised on a very short stipe: 

 seeds numerous, minute. — Alkaline plains, Hacienda de Angos- 

 tura, San Luis Potosi, July, 1891 (n. 3765). This plant, which 

 is very different in habit and inflorescence from any Androsace 

 which I know, appears nevertheless to agree with that genus in all 

 essential characters of flowers and fruit. The genus as described 

 by Bentham and Hooker is rather widely drawn. The species just 

 characterized agrees more nearly with § Aretia than with Euandro- 

 sace, but differs from both in its inflorescence. 



Dictyanthus tuberosus. Root thickish, enlarged and fusiform 

 toward the end, resembling a small tuber: stem short, somewhat 

 woody, erect or procumbent, bearing near its summit several sub- 

 simple spreading hirsute branches : leaves ovate, acuminate, entire, 

 deeply cordate, with a narrow but rounded sinus, pubescent on both 

 surfaces and ciliate, l-l£ inches long, on hirsute petioles 4-7 lines 

 in length: flowers occasionally solitary, usually 2-4 together, with 

 or without a short common peduncle ; pedicels 2-4 lines long : calyx 

 divided nearly to the base into lanceolate acuminate hirsute seg- 

 ments, 3-4^ lines in length: corolla campanulate, 4-6 lines deep: 

 tube marked with narrow purple stripes; limb of spreading tri- 

 angular segments of dark color, and but 2-3 lines in length: folli- 

 cle narrowly lanceolate in outline, about 2 inches long, tapering to 

 a bluntish apex, armed with short, firm spines, and appearing striate 

 from numerous minute longitudinal folds of its outer integument. — 

 Slopes of barranca near Guadalajara, September, 1890 (n. 3568). 

 First collected by Dr. Edward Palmer near the same locality, July, 



