﻿Nelson : New Plants from Wyoming ' 281 



the junction of the two cells but the cells hardly confluent; not 

 explanate. 



This plant has the habit of P. coerulem Nutt, but is readily 

 distinguished by its broader, shorter leaves ; its shorter inflores- 

 cence and smaller flowers ; its broader, shorter and slightly scar- 



ious sepals, etc. 



Abundant in the sand dunes in the hill region of the Red 

 Desert, near Point of Rocks. Collected June i, 1897, at which 

 time it was nearly out of blossom. Type specimen in the Herb. 

 University of Wyoming, no. 3090. 



* 



■ 



Pentstemon Rydbergii. 



Perennial from horizontal rootstocks which give rise at some- 

 what regular intervals to vertical branches ; from the crowns of these 



spring long slender floriferous stems or very short leafy branches ; 

 glabrous throughout, 3-5 dm. high ; radical leaves and those on 

 the sterile branches oblong, obtuse, on slender petioles as long 

 as the blade or longer ; cauline leaves few, sessile by a broad 

 base, narrowly oblong ; the lowest pair of bracts leaf-like, broadly 

 linear ; the two or more verticils of the interrupted spike many- 

 flowered, the lower one usually distant ; corollas 10-14 mm. long, 

 light blue; sepals scarious, somewhat lacerate-margined. 



This beautiful form has enough points in common with P. con- 

 fertus Dougl. to suggest that species which is probably the nearest 

 ally. It was met with in abundance in an aspen grove in a draw 

 in the Laramie Hills, July 1, 1897. Type specimen in Herb. Uni- 

 versity of Wyoming, no. 3214. I take pleasure in naming this 

 for Mr. P. A. Rydberg, whose generous assistance I have acknowl- 

 edged on a previous page. 



WULFENIA WYOMINGENSIS. 



Perennial from a short rootstock, bearing numerous fascicled 

 roots ; stems 1-3 from each rootstock, puberulent or softly pubes- 

 cent, 1-2.5 dm. high ; radical leaves petioled, from broadly ovate 

 to oblong, crenate-dentate, rounded or subcordate at base, mostly 

 obtuse at apex, very variable in size, obscurely puberulent ; cauline 

 leaves sessile, small, diminishing upward, broadly ovate, mostly 

 acute ; bracts broadly lanceolate, narrower toward the apex of the 

 spike, pilose-pubescent ; calyx anteriorly cleft to the base, poste- 

 riorly into two or three lobes to about the middle, the' lobes either 

 entire or (if only two) with two tooth-like lobe- ; corolla wanting ; 

 stamens conspicuous, filaments twice the length of the calyx, 



