LE DC Fe NR See EE TEE OTM ee ee ee! 
eae : panei bias ees : 
OF ARTS AND SCIENCES. 179 
Gray, but differs in its scattered, not at all cymose heads, and 
larger, thinner entire leaves glandular only on the margins. 
CNicus EXCELSIOR. Very tall, 6-10 feet high: stem ribbed, 
partially covered with a deciduous arachnoid pubescence: lower 
leaves lanceolate, acute, subentire, somewhat repand toward the 
base, spinulose-ciliate, 8 inches long, 2 inches broad, narrowed be- 
low into a petiole 2-3 inches in length, pale green and more or less 
arachnoid above, covered beneath with a thin gray arachnoid to- 
mentum; cauline leaves sometimes a foot or more in length and 5 
inches in breadth, sinuate-pinnatifid, with triangular, acute lobes, 
spinulose on the edges, sessile and conspicuously decurrent in broad 
wings (3-4 inches in length): inflorescence branching; the branches 
bearing toward their summits several small rather closely aggre- 
gated heads: heads in anthesis 7-8 lines, in fruit 1 inch broad; 
scales of the involucre appressed, regularly imbricated, narrowly 
ovate, narrowed above or somewhat abruptly contracted to a short _ 
ascending or spreading yellowish spine, and bearing near the apex 
just beneath the spine a dark glandular (?) streak; the inner bracts 
longer, narrower, very acute but unarmed, purplish: corollas purple, 
the narrow throat contracted very gradually into the slender tube; 
limb not very oblique: filaments hairy: style branches short, not 
exceeding 3 of a line iu length; annulus inconspicuous. — Among 
shrubs, low lands, Hacienda de Angostura, July, 1891 (n. 3768). 
Near C. altissimus, Willd., which it resembles in its soft, weakly 
armed leaves of varying form, closely also in its involucre and the 
color of its flowers, as well as in its tall habit. It differs, however, 
in its stron gly decurrent leaves, smaller, more numerous, and closely 
aggregated heads, shorter style branches, and less oblique corolla. 
Prrezta MicHoacana. Stem slender, striate-angulate, glabrous, 
dark purple, 4-6 feet in height, bearing a loosely corymbose, rather 
few-headed inflorescence: leaves obovate-spatulate, sharply denticu- 
late, rounded at the apex, auriculate-clasping at the base, glabrous, 
veiny, thickish, and somewhat rigid; the lower ones 6 inches long, 
alf as broad; the upper smaller and more inclined to be acute; 
those of the inflorescence much reduced, 3-9 lines in length, lin- 
ear-oblong, acute: heads 3 of an inch high, 40-flowered: scales of 
the involucre dark purple, fulvous-tomentose on the edges, imbri- 
cated in 5-6 ranks and varying greatly in length, the outer being 
very short, but all acute: corolla purplish: style branches recurved: , 
Immature achenes linear, striate, glandular-roughened. — Hills 
near Patzeuaro, Michoacan, December, 1891 (n. 3988). This spe- : 2 
