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.falcatwm 

 Si of Decand., Vol. v., p. 233, which, probably, does not appertain to that species. 



Gnaphalium *depressum; canescently lanuginous, stemless, and csespitose; 

 leaves linear, obtuse, the primary ones smooth; capitulum solitary, sessile, cam- 

 panulate; scales of the involucrum brown, oblong, acute; achenium villous. 



Hab. 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 Omalotheca. 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, with 

 only four or five hermaphrodite or sterile ones, and is therefore a true Gnaphalium, 



§.. Omalotheca. (Genus of Decand. and Cassini.) 

 *Heterophania. — Dioicous; the sexes of different forms. 



Gnaphalium *di7norphum; 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! 



Hab. 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 Antennaria, as the threads of 

 the pappus are all slender and equal in the male. 



FILAGO. (Tournefort.) 



Filago * Calif ornica; Q, stem erect, branching from the base; leaves spathu- 

 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 



