Ser ee eae ST ge ne ee ea ae 
Ree ee ee 
Robinson and Greenman—Mexican Plants. 159 
related species, C. pachyphylla Sch. Bip. and C. Palmeri Greene, 
besides being of very different shape. 
CacaLia TRIDAcTYLITIS. Tall, 8 feet high: stem leafy, sulcate- 
angulate, purplish, tomentulose: leaves trifid at least to the 
middle, green and puberulent above, paler and grayish-tomentose 
beneath, 3 to 6 inches long, nearly as broad, pinnate-palmately 
5-7-nerved from somewhat above the cuneate base; lobes lanceo- 
late, acute, somewhat incised-dentate: inflorescence a broa 
rate: flowers white, considerably ee the involucres: 
achene ribbed, glabrous.—Collected by C. G. Pringle, on the 
Sierra de San Felipe, Oaxaca, altitude 6,000 feet, 19 November, 
1894 (No. 5841). 
CNICUS IMBRICATUS, Slender, 3 to 5 feet high: radical leaves 
inal a dding, 
pressed-globose, 14 inches in diameter: involucral scales linear- 
anceolate, spinose-tipped, the outer spinose-ciliate, the inner elon- 
Wet meadows, Sierra de Clavellinas, altitude 9,000 feet, October, 
1894 (No. 6006). A very attractive species. 
ROSTEPHANUS n. gen. of Asclepiadacece (Gonolobee). Calyx 
5-parted, glanduliferous at the sinuses within. Corolla rotate, 
>-parted ; tube short; lobes flat, ovate or oblong, with dextrorsely 
imbricated margins. Corona borne upon the lower part o 
rt 
oblique; pollinia solitary in the cells, almost pendulous. Stigm 
depressed, Fruit and seeds unknown.—Twining. Leaves oppo- 
