AND GENERA OF PLANTS. 405 
tomentose on both surfaces, and the lanuginous tomentum somewhat spreading, or flocculent. 
From G, sylvaticum it may be distinguished by the form of its leaves, and particularly by the scales 
of the involucrum, which in that species are lanceolate, and oblong obtuse, with the margin in 
place of the tips brown.—Perfect florets three or four.—It appears to be nearly allied to G. faleatum 
6? of Decann., Vol. V., p. 233, which, eee ae not appertain to that =, 
Gnaphalium * depressum; canescently lanuginous, stemless, and cespitose; 
leaves linear, obtuse, the primary ones smooth; capitulum solitary, sessile, cam- 
panulate; scales of the involucrum brown, oblong, acute; achenium villous. 
Has. The summit of the mountain, Pichincha, South America, (Dr. Jamieson.) I introduce 
this curious alpine plant, on account of its near relation to our section Omatorneca. It would 
readily be overlooked for a stemless individual, of O. supina, from which it is only distinguishable 
by the largeness of the capitulum, which, moreover, contains several rows of female florets, = 
only four or five hermaphrodite or sterile ones, and is therefore a true Gnaphalium. 
§. OmaLoTHEca. (Genus of Decand. and Cassini.) 
* Herrropranta. —Dioicous; the — of different forms. 
Gnaphalium *dimorphum; white and lanuginous, stoloniferous; stem fili- 
form, one-flowered; leaves linear, obtuse; in the female spathulate, in the male 
narrow-linear and attenuated below; scales of the involucrum in the male lan- 
ceolate acute, brownish; in the female very long acuminate! 
Has. On the Black Hills of the Platte. Flowering in the beginning of May. The male plant 
has a very stout, creeping, almost woody root, sending out thick, lanuginous, short stolons. Stem 
like a slender leafy peduncle, the leaves about an inch long or more, and about half a line to a line 
wide. Involucrum rather large, and somewhat campanulate, the scales pale brown; florets about 
fifteen, infertile, though apparently hermaphrodite, twice as large as in O. supina; but for the rest 
the plants could scarcely be told apart, in the depauperated individuals of the latter.—In the female, 
the leaves are spathulate, about an inch long, and two or three lines wide! the involucrum is also 
larger, with very long points to the scales! Notwithstanding all these curious discrepancies our 
plant is inseparable in genus from Gnaphalium supinum. It is not an “ntennaria, as the threads of 
the pappus are all slender and equal in the male. 
oe 
FILAGO. (Tournefort.) 
Filago * Californica; O, stem erect, branching from the base ; leaves peti 
late-linear, apiculate, below nearly smooth, the upper ones and the stem arach- 
noidly tomentose; capituli few, paniculate, in lateral and terminal clusters, 
sometimes almost in spikes; scales of the involucrum tomentose at base, above 
VII.—5 B : 
