286 DESCRIPTIONS OF NEW SPECIES 



purple, as well as the pappus, which is as long as the florets. Corolla wider 

 at the summit, rather deeply cleft. — The habit of this singular species is much 

 more that of Kleiriia or Eupatorium than that of Liatris, with which, however, 

 the flowers best agree. 



EUPATORIUM.— Section I. Cylindrocephala. (Decand.) 



Eupatorium * calocephalum; herbaceous, somewhat scabrous and pubescent; 

 leaves opposite, narrow-lanceolate, oblong, denticulate, three-nerved and sub- 

 petiolate; flowers paniculate, corymbose; capituli cylindric-ovate ; involucrum 

 closely imbricate; scales three-striate, oblong-obtuse, the innermost purple; 

 florets fifteen to twenty. — Liatris oppositifolia, (Nuttall,) in Silliman's Jour- 

 nal, Vol. v., p. 299. A species so remarkably distinct from the other group 

 of the United States as to have led me into the error of referring this species 

 to the genus Liatris: better specimens have now proved it to be an Eupatorium 

 of Decandolle's first section. The stem somewhat scabrous, slender, twiggy, 

 and herbaceous, about two feet high, the upper branchlets terminating in tri- 

 chotomous flowering corymbs. Each capitulum pedicellate; scales of the in- 

 volucrum chaffy, striate, and with a coloured, slightly foliaceous tip, mostly 

 purple; florets scarcely exserted; pappus short, slightly scabrous; achenium 

 smooth, five-striate. Receptacle naked. 



Eupatorium occidentale, /?. suhroseum. In the Rocky Mountains, toward the 

 waters of the Columbia, and in the Blue Mountains of Oregon. 



Eupatorium Oregonum, slightly scabrous; leaves opposite, above alternate, 

 petiolate, ovate, acute, entire; corymb sub-coarctate, few-flowered; involucrum 

 twelve to fifteen flowered, scales almost in a simple series, acute, pubescent; 

 achenium five-striate. — Hab. In the Rocky Mountains, towards the sources of 

 the Malade of the Oregon. Nearly allied to the preceding. A very dwarf 

 species, about six inches high. Leaves about an inch long, somewhat three- 

 nerved. Flowers pale pink. 



BULBOSTYLIS. (Decand.) 



Bulhostylis * microphylla ; suffruticose low, viscidly pubescent, villous and 

 much branched; leaves alternate, ovate, subserrate, on the branches numerous 



