BOTANICAL OBSERVATIONS IN WESTERN WYOMING. TL 
-e Nuttallian plant was rediscovered, Tanacetum Nuttallii 
Torr. & Gray, and growing in close proximity with this was 
found Vesicaria Alpina Nutt., both probably near the original 
station of Nuttall. 
Nearly everywhere over this district in exposed situations we 
meet with Eriogonum ovalifolium Nutt., forming dense silvery 
cushions, its close globular heads of flowers exhibiting-a great 
variety of tints from pure white to dark brown. Almost equally 
abundant on gravelly slopes also occur Aplopappus acaulis Gray, 
and Astragalus simplicifolius. Gray, presenting a neat contrast 
of colors in their bright yellow and blue flowers, resting in mats of 
dark green and silvery foliage. 
Quite constantly associated in growth with Astragalus flavus 
Nutt. is a showy asteroid plant with large white flowers, disposed 
in flattened summits surmounting the dull colored tomentose leaves. 
This plant, according to Dr. Gray, is closely allied to or perhaps 
identical with the Xylorhiza villosa Nutt. (Aster Xylorhiza Torr. 
& Gray). In view of the discrepancy in many respects between 
this plant and that described by Nuttall, Dr. Gray has thought - 
proper to characterize it as a new species, Aster Parryi. 
Among other plants worthy of note in this district may be 
enumerated Delphinium Menziesii DC., Sisymbrium junceum 
Bieb., Viola Nuttallii Pursh, Cymopterus montanus Nutt., Cym- 
opterus Fendleri Gray, Antennaria dimorpha Nutt., Artemisia 
pedatifida Nutt., Phlox longifolia Nutt., Phlox canescens Torr. & 
Gray, Castilleia parviflora Bong. o Pentstemon humilis Nutt., and 
Gilia pungens Benth. 
On reaching the higher ground forming the eastern rim of the 
Green River basin, which leads by an easy pass, at an average ele- 
vation of seven thousand feet above the sea level, from the Pacific 
to the Atlantic slope, the prevalent desert growth gives place to 
-a vegetation partaking of a sub-alpine character. This district 
comprises the botanical localities designated by Nuttall as “ dry 
and lofty hills in the central range of the Rocky Mountains.” 
Here accordingly we again come within the range of these early 
discoveries in re-collecting such choice plants as Draba Alpina L., 
var. densifolia, Lepidium montanum Nutt., Trifolium Andinum 
Nutt., Trifolium gymnocarpon Nutt., Astragalus campestris Gray, 
Oxytropis lagopus Nutt., and Phlox bryoides Nutt. 
Here also we meet for the first time, probably near its south- 
eastern limits, the interesting Lewisia rediviva Pursh. This 
- 
