OF ARTS AND SCIENCES. 269 



2 lines long, the outer linear, the inner ovate, acute : capsule nearly 

 equalling the calyx. — In the same region ; C. G. Pringle (u. 1187), 

 Oct., 1887. 



Silene Pringlei. Finely roughish-tomentose and subglandular, 

 slender, erect, 1 to 3 feet high : leaves linear-lanceolate, acuminate, 

 narrowed to the base, 3 to 7 inches long : inflorescence more or less 

 elongated, the peduncles at each node 1-3-flowered, erect, slender : 

 calyx narrow, 10-nerved, 7 or 8 lines long, the ovate teeth fimbriate- 

 ciliate ; petals an inch long, dull brownish-purple (?), auricles promi- 

 nent, appendages large and saccate, entire, the blade bifid to below 

 the middle with a tooth on each side : stamens and styles scarcely 

 exserted : capsule oblong-ovate, stipitate : seeds finely tuberculate. — 

 On cool slopes at the base of cliffs in the Sierra Madre, Chihuahua ; 

 C. G. Pringle (n. 1190), Oct., 1887. 



Cerastiuji Madrense. Perennial (?), a foot high or more, viscid- 

 pubescent throughout : leaves mostly radical, oblong- to narrowly 

 oblanceolate, 2 inches long, glabrous above, sparsely villous beneath 

 and villous-ciliate, the cauline few and distant, linear-lanceolate to 

 linear : inflorescence cymosely paniculate, the flowers on slender 

 pedicels an inch long, nodding in fruit ; bracts small : fruiting calyx 

 2| to 3| lines long, the exserted capsule slightly curved. — On the 

 cool summits of the Sierra Madre, Chihuahua ; C. G. Pringle (n. 

 1504), Oct., 1887. 



Malvastrum jacens, Watson. An erect form of this with more 

 deeply lobed leaves was collected by Mr. Pringle (n. 1199) on sandy 

 stream-banks in the Sierra Madre. This species is referred by 

 Dr. Gray (Proc. Amer. Acad. 22. 288) to M. Peruvianum, from 

 which it differs especially in its fascicled clusters of flowers in the axils 

 or on short peduncles, not " at length evolute into unilateral spikes," 

 and in the fewer (6, rarely 8) and more turgid carpels. 



Hibiscus spiralis, Cav. ? Collected by Mr. Pringle (n. 1452) 

 in the valley of Mexico ; differing from H. tubiflorus, DC, chiefly in 

 the more shrubby habit, the small leaves more cuneate at base, and 

 the shorter blunt lobes of the calyx. 



Linum Pringlei. Biennial (or sometimes perennial ?), erect and 

 rather strictly branched from the base, the stems with slender ascend- 

 ing branches above, glabrous and glaucous : leaves numerous, erect 

 and more or less imbricated, without glandular stipules, oblong- 

 oblanceolate, acute, 6 lines long or less : inflorescence loose ; pedicels 

 slender : sepals lanceolate, carinate, slightly scabrous on the margin, 

 1| lines long; petals white, twice longer: capsule broadly ovate, 



