Robinson and Greenman—Mexican Plants. 159 
related species, C. pachyphylla Sch. Bip. and C. Palmeri Greene, 
besides being of very different shape. 
CaACALIA 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 broad 
corymbous panicle leafy at base: heads very numerous, 5 lines in 
length, about 10-flowered, calyculate: involucral scales about 7, 
oblong-linear, acute, somewhat keeled, scarious margined, glab- 
rate: flowers white, considerably exceeding 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 impricatus. Slender, 3 to 5 feet high: radical leaves 
narrow and elongated 10 to 18 inches long, an inch wide, divided 
to the rhachis; the broadly ovate, angulate spinose-dentate lobes 
very numerous, about 80, mostly attenuate and regularly imbri- 
cated, green and puberulent, glabrate above, grayish-arachnoid 
beneath ; cauline leaves narrowly oblong, pinnatifid, decurrent at 
the base, 2 to 3 inches long; lobes short, spinose-dentate: heads 
terminal and solitary on long slender branches, nodding, de- 
pressed-globose, 14 inches in diameter: involucral scales linear- 
lanceolate, spinose-tipped, the outer spinose-ciliate, the inner elon- 
gated, densely purplish-lanate-—Collected by C. G. Pringle, in 
wet meadows, Sierra de Clavellinas, altitude 9,000 feet, October, 
1894 (No. 6006). <A very attractive species. 
URosTEPHANUS n. gen. of Asclepiadacece (Gonolobee). Calyx 
5-parted, glanduliferous at the sinuses within. Corolla rotate, 
5-parted ; tube short; lobes flat, ovate or oblong, with dextrorsely 
imbricated margins. Corona borne upon the lower part of 
the column, tubular, nearly equalling the gynostegium, shallowly 
parted at the summit into 5 internal hornlike processes opposite 
the stamens and five external lobes alternating with them and 
produced on their outer surface and just beneath the apex into 
two filiform flexuous tails. Stamens united with the base of the 
corolla; filaments connate into a very short tube; anther-cells 
oblique; pollinia solitary in the cells, almost pendulous. Stigma 
depressed. Fruit and seeds unknown.—Twining. Leaves oppo- 
Site, ovate, cordate. Flowers umbellate-cymose. 
U. gonoxtosorpes. Hirsute with somewhat tawny hairs sub- 
appressed on the leaves and reflexed on the slender stem: leaves 
ovate, entire, acuminate, cordate with a narrow sinus and rounded 
lobes, searcely paler beneath, 2 to 24 inches long, half as broad; 
petioles half to three-fourths inch in length: peduncles 2 lines 
long, 1-5-flowered; pedicels of equal length : lobes of the calyx 
ovate-lanceolate, acute, nearly 2 lines long; pilose externally, 
glabrous within: corolla in dried state olive green, pilose exter- 
nally and covered at the throat within, with a short dense wool ; 
