424 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



more or less viscid •, leaves very fleshy, linear, sinuatelv lobed, ex- 

 cept the sometimes petiole-like lower portion, viscidly pubescent, 5—8 

 cm. long ; head solitary, 1.5-2 cm. high, hemispheric, its bracts linear- 

 lanceolate, viscid-pubescent and more or less villous ; rays light yel- 

 low, less than i cm. long : achenes tapering downward, densely silky- 

 strigose ; pappus of fimbriate scales, about 2 mm. long. 



Nearly related to H. nana, but differs in the leafy stem, the more 

 hemispheric head, and the shorter rays. It may possibly be the 

 same as H. nana Larscni Gray, but that is described as being more 

 woolly than H. nana, whicli is not the case with the present species, 

 which, if anything, is less woolly. 



Grows among rocks, at an altitude of about 3000 m. It is a 

 rather rare plant. 



Montana: Indian Creek, July 22, 1897, Rxdberg & Bcsscy, 

 31^4: Mt. Chauvet, Jul}- 29, 5/95, • Lone Mountain, 1886, Tzvccdy, 

 iiig. 



Yellowstone Park: Electric Peak, Aug. 18, Rydbcrg ds Bcs- 

 sey, ^ig^a; Mt. Holmes, 1884, Tweedy, lyS. 

 Tetraneuris acaulis (Pursh) Greene, Piltonia, 3 : 265 : Galardiaacaiilis 



Pursh, Fl. Am. Sept. 743 ; ActincUa acaulis Nutt. Gen. 2 : 173 



[Syn. Fl. i'- : 345; Man. R. M. 195] ; Picradcnia acaulis Brit- 

 ton, 111. Fl. 3 : 449. 



On dry hills, up to an altitude of 2500 m. 



Montana : Fort Benton, John Pearsall, ^26; Livingston, 1889, F". 

 Tweedy; Great Falls, 1886, P. W. Anderson, 243; 1891, R. S. 

 Williams, 82; Lewis and Clarke Co., Mrs. Mut/i; Billings, 1882, 

 Canhy ; Madison River, 1883, Scribncr, 112a. 



Yellowstone Park: 1888, Dr. Chas. H. Hall. 

 Rydbergia grandiflora (Torr. & Gray) Greene, Piltonia, 3: 270; 



AciineUa o-yandillora Torr. & Gray, Journ. Nat. Ilist. Soc. Bost. 



5: no [Syn. Fl. i" : 345; Man. R. M. 196]. 



On high mountains, at an altitude of 2500-3000 m. 



Montana: Beaver Head, 1888, Tweedy, 21 ; Rattlesnake Creek, 

 1887, 21 ; Lone Mountain, 1886, 1118 ; Lima, 1895, Rydbcrg, 2gjj ; 

 Cedar Mountain. July 16, 1897, Rxdberg & Bessey, j/pj. 

 Picradenia Richardsonii Hook. Fl. Bor. Am. i : 317 ; Actinella 



Richardsonii Nutt. Trans. Am. Phil. Soc. (II.) 7: 379 [Syn. 



Fl. I-: 347; Bot. Cal. i: 394; Man. R. M. 196]. 



Dry plains, up to an altitude of 1500 m. 



Montana ; Fort Benton, John Pearsall, poj ; Madison Co., 1888, 



