TROPICAL AMERICAN EUPATORIEAE 25 
eupatorium (Hoffm.) Ktze. Rev. Gen. iii. 147 (1898) by incidental 
mention and without generic diagnosis——A Bolivian monotype with 
the following specific character. 
S. Hoffmannii Ktze. |. c. An erect slightly ligneous perennial 
1.5 m. high; stem terete, 4-5 mm. thick, purplish-brown, puberulent 
when young, at length merely granulated or glabrate; branches 
opposite, spreading-ascending; leaves opposite, ovate, acuminate, 
rounded to a somewhat cuneate base, shallowly mucronate-~lentate, 
chartaceo-membranaceous, 6-8 cm. long, 3-5 em. wide, above sparsely 
puberulent, beneath slightly paler, puberulent on the midrib and 
loosely reticulated veins, glandular-punctate; heads about ll- 
flowered (with 5-7 partially developed rudiments in the centre) ses- 
sile in dense globose glomerules (about 11 mm. in diameter); invol- 
ucre little imbricated, the scales about 3 mm. long, lance-o ; 
obtusish, mostly 2-3-costulate, hispidulous dorsally; corollas 2.7 mm. 
long, somewhat bulbose at base, slightly and gradually enlarged up- 
ward, essentially glabrous; achenes about 1.7 mm. long, dark-brown 
and somewhat glandular-roughened on the faces, hispidulous on the 
angles; pappus-bristles about 20.—Eupatorium Hoffmannii Ktze. 
ex. Hoffm. 1. ¢. (1897) without specific char., also Rev. Gen. iii. 147 
(1898) where described—Bouivia: Dept. Santa Cruz, Prov. East 
Velasco, alt. 200 m., Kuntze (N. Y., phot. Gr.). 
The only other genus of this particular affinity to exhibit a pale- 
aceous receptacle is the Mexican Eupatoriastrum Greenman, a plant 
of quite different habit, large simple heads, pales expanded toward the 
tip, and other distinctions. 
FurtHer Notes oN THE GENUS Opuryosporvs.—The most 
desirable boundary between Eupatorium and Ophryosporus has long 
been subject to doubt. When some years ago engaged on the re- 
vision of Ophryosporus (Proc. Am. Acad. xlii. 17-27) the writer hesi- 
tated to include in the genus several Peruvian and Bolivian species 
(much too scantily represented for satisfactory investigation) in 
which the anther appeared to have at least some slight rudiment of 
an appendage. In recent work upon South American plants of this 
affinity, this boundary problem has again been studied, particularly 
from the side of the genus Eupatorium. It has been found that of 
the species in question at least four not only possess all the essential 
features of Ophryosporus but are certainly related to undoubted 
species of that genus. These are Eupatorium chilea HBK., E. affine 
HBK., E. hepanthum Sch.-Bip., and E. eleutheranthemum Rusby. 
Concerning one of these species, namely E. chilea, the writer was 
