Wyoming Experiment Station. 



in the Pine needles in the shade less, casspitose and of ranker 

 growth. Laramie, June 20, 1894 (No. 225); Wind River Moun- 

 tains, August II, 1894 (No. 856); Laramie Peak, August 7, 1895 

 (No. 1595). 



Arenaria Sajanensis, Willd. Schlecht. Berl. Mag. Natf. 200 (18 16). 



This plant collected at almost the opposite extremes of the state 

 seems to confine itself to the naked alpine summits. Union 

 Peak, August 13, 1894 (No. 1009); La Plata Mines, August 22, 

 1895 (No. 1826). 



Arenaria sp. (See appendix). 



Tissa sparsiflora, Greene, Erythea, iii, (1895). 



This recently described species seems to have a very circum- 

 scribed range. It was first observed in the autumn of 1894, when 

 it was collected by the writer in a wet meadow, some seven miles 

 from Laramie, in a soil strong with alkali, receiving seepage 

 water from an irrigation ditch. A very rank growth, resulting in 

 long, lax and sparsely flowered stems had^been attained. Obser- 

 vations upon it in 1895 in the same andjother localities show that, 

 under normal conditions, it grows to only 3-8 inches in height; that 

 it is nearly erect, but freely branched from the base. This shorten- 

 ing of the stems shows the flowers to be numerous in proportion to 

 the size of the plant and makes the specific name hardly character- 

 istic. In the original description the^observalion is made that it is 

 the first Tissa reported from the interior of the continent. Ob- 

 served only about Laramie and in low alkah ground. Seven Mile 

 Lake, October 15, 1894 (No. 1158); Laramie, September 3, 1895 

 (No. 1868). 



PORTULACACEiE. 



Portulaca oleracea, L. Sp. PI. 445 (i753)> 



Becoming introduced in some localities; from Sheridan Expt. 

 Farm, by the superintendent, J. F. Lewis, September 1895. 

 Calandrinia pygmaea, Gray, Proc. Am. Acad, viii, 623. 



A beautiful little plant of alpine habitat. Union Peak, 



August 13, 1894 (No. 1015); La Plata Mines, August 20, 1895 



(No. 1778). 



Claytonia Caroliniana sessilifolia, Torr. Pac. R. Rep. iv, 70 (1856). 



Common on hillsides in rich, damp soil. Laramie Hills, May 



12, 1894 (No. 27); Pole Creek, May 18, 1895 (No. 12 19). 



