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 Kleinia or Eupatorium than that of Liatris, with which, however, 
the flowers best agree. 
EUPATORIUM.—Section I. CyLInpDRocEPHALA. ‘(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, 3. subroseum. Inthe 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—Has. 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.) 
Bulbostylis * microphylla ; suffruticose low, viscidly pubescent, villous and 
much branched; leaves alternate, ovate, subserrate, on the branches numerous 
