258 Enumeraiion of Plants of the Rocky Mountains, 



P. pycnorhiza (a very rare arid little known species from the Caucasus, 

 which, however, seems too like P. algida), and it doubtless lies betweeu 

 that species and P. nivalis: but it can hardly be referred to either, al- 

 though possibly, all these species may be found to merge in one. Dr. 

 Parry remarks that " This fine species is quite constantly met with on tbe 

 borders of alpine streams near the snow line ; its knotted fibrous roots 

 matted together, and constantly bathed in ice-cold water. Its usual beif][bt 

 about 12 to 18 inches: flowers of a deep carmine red (fading to purple), 

 with a slight primrose odor; leaves glossy on tbe upper surface, pale 

 green. It flowers in July. It must be quite extensively diffused in its 

 peculiar localities, and it is a wonder it baa not been found before. In 

 ray sketch map I have named one mountain stream Primrose Creek, on 



312. Dodecatheon Meadia, L. A slender, few-flowered variety of this 

 polymorphous species. 



313. Androsace septentrionalis, L. Both alpine and in the valleys. 



314. Phacelia Popei, Torr. & Gray in Pacific R. R. Rep. 2, p. 172, t. 

 10. "Whole plant of a brownish-green color, often robust, 8 to 15 

 inches high." 



315. Eriogonum umhellatum, Torr. in Ann. Lye. N. Y., 2, p. 241, 4 

 in Sitgreaves, Rep. t. 12. Flowering specimens : flowers bright yellow, 

 as they are in Hayden's and other specimens, , 



316. The same as 315 in fruit; the perianth changed to paleyeUow 

 turning brownish. 



318. The same species, apparently, as the two foregoing, hnt tbe 

 flowers in tbe fine and well preserved specimens are obviously white o 

 cream color. Which form is the original of James's collection, i 8^ 

 unable now to determine. Torrey's figure, in Sitgreaves' Expedition » 

 a good one, but there is nothing answering to it in the letter-press. 

 The rays of the umbel are more numerous, slender, and simple i° au 

 these specimens than in Hooker's figure of ^. stellaium ; but a Poug- 

 lasian specimen appears to belong to this species. 



317. Eriogonum fiavum, ^\xtt. 



3 1 9. Eriogonum alatum, Torr. 



320. Eriogonum annuum, Nutt. . 



321. Eriogonum effusum^ Nutt Flowers white: those oi E. micro- 

 theca, Nutt, are yellow. 



322. Polygonum tenue, Michx. Hillsides, near Central City. 



323. Montelia tamariscina. Gray? male plant 



324. Euphorbia marginata, Pursh. 



325. Crohn (Hendecandra) muricatum, Nutt. 



326. Froelichia Floridana, Moq. 



327. Cydoloma platyphijllum, Moq, 



328. Eurotia lanaia, Moq. IHolis, Parsk 



329. Euphorbia hexagona, Nutt 



330. Euphorbia petaloidea, Engelm, 



331. Solanum roslratum, Dun. S, heterandum, Parsh. 



332. Polygonum viviparum, L. 



333. Polygonum Pislorta, L., var. oblongifdium, Meisn. ., . 



334. Oxyria digrjna, R. Br. " Common in the alpine region; ti* 

 specimens collected are from a lower elevation, and are large." 



