382 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN, 



Pyrrocomi uniflora (Hook.) Greene, Erythea, 2 : 60 ; Donia unffora 

 Hook. Fl. Bor. Am. 2 : 25 : Aplopappns unljiorus Torr. & Gray, 

 Fl. N. Am. 2: 241 [Syn. Fl. i" : 128; Man. R. M. 146]. 

 In saline soils and around hot-springs, at an altitude of 2000-2500 



m. All Montana and Yellowstone Park specimens are much smaller 



than Hooker's type and often with entire leaves. 



Montana: Granite, 1892, F. D. Kehey ; Beaver Head Co., 1888, 



Tjueedv, 2ji ; Grasshopper Valley, 1880, Watson, 18^. 

 Yellowstone Park: Lower Geyser Basin, Aug. 4, 1897, I^yd- 



berg & Besscx, ^ojo and 30^2: Lone Star Geyser Basin, Aug. 7, 



jOji ; Hot Springs, Yellowstone Lake, 1884, Tzvecdy, ijj. 



* Pyrrocoma inuloides (Xutt.) Greene, Erythea. 2 : 60 : Aplopappns 



inidoides Torr. & Gra}-, Fl. N. Am. 2 : 241 : Aplopappns tiniflorns 

 Grav, Syn. Fl. i'- : 128, in part. 



Like P. iin/flora, but denselv woollv. At an altitude of 2500 m. 

 Yellowstone Park : 1873, C. C. Parry, /^p. 



* Pyrrocoma Howellii (Gray) Greene, Erythea, 2 : 70 ; Aplopappns 



Hoii'd/ii Gvdy, Syn. Fl. i- : 446. 



Like P. nniffora, but sericeous-tomentose when young, bracts 

 rather obtuse and leaves subentire. 



Montana: Butte, 1895, Rydbcrg, 2808. 



Pyrrocoma Lyallii (Gray) ; Aplopappns LyalUi Gray, Proc. Acad. 



Sci. Phila. 1863: 64 [Syn. Fl. i" : 131 ; Man. R. M. 148]. 



It is with great hesitation that I refer this species to Pyrrocoma^ as 

 the habit is different, the pappus white, and the bracts rather thin. 

 The bracts are foliaceous, not with the thin margin of Stcnotns and 

 the leaves are not evergreen. Hence placing it in Stcnotns would 

 not do. It was placed by Gray nearest H. pygniacns, which Greene 

 has referred to Macroncnia. The present species could not be referred 

 there as it has neither the thick bracts nor the long style of that genus. 

 It may be the type of a new genus, but my material is too meagre 

 for a thorough study. 



Montana: McDonald's Peak, Mission Range, 1883, Canhy, 166 ; 

 Indian Creek, Juh^ 22, 1897, Rydbcrg & Bcsscy. 



Yellowstone Park : 1885, Tzvecdy, yjd. 



Stenotus caespitosus Xutt. Trans. Am. Phil. Soc. (II.) 7:335; 

 Aplopappns acanlis glabratns Eaton, King's Exped. 5: 161 [Syn. 

 Fl. i': 132; Man. R. M. 149]. 



