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, siuuate-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 an thesis 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 f of a line in 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 strongly decurrent leaves, smaller, more numerous, and closely 

 aggregated heads, shorter style branches, and less oblique corolla. 



Perezia 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, 

 half 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 § 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 Patzcuaro, Michoacan, December, 1891 (n. 3988). This spe- 



