﻿280 Nelson: New Plants from Wyoming 





Pentstemon radicosus. 



I 











Cespitose, the short rootstocks producing an inordinate num- 

 ber or coarsely fibrous roots which form an almost unbreakable I 

 tufted mat ; stems numerous, slender, fascicled, strict and erect, I 

 forming a dense bunch which crowns the compact, tufted root sys- 

 tem, 2-3 dm. high ; stems and leaves puberulent, obscurely 

 glandular upward including the inflorescence ; root leaves minute, 

 oblanceolate, or none ; stem leaves numerous, oblong-linear, very 

 short-petioled or sessile by a narrowed base, 2-4 cm. long, nar- 

 rower upward and passing into the linear bracts ; inflorescence a 

 compact thyrsus of peduncled cymes, 4-8 cm. long ; peduncles 

 8-12 mm. long, about 3-flowered, pedicels very short; sepals 

 broadly lanceolate, somewhat scarious, about one-third the length 

 of the corolla, tips spreading ; corolla tubular, dark blue with a 

 lighter streak down the lower side of the tube, 14-18 mm. long, 

 upper part of the tube slightly inflated, bilabiate, the lower lip 

 longer, very sparsely white bearded, lobes entire, rounded, 3-4 

 mm. long ; sterile filament included, straight, slightly flattened to- 

 ward the apex, the short yellow beard straight, stiff, of nearly 

 uniform length, at right angles to the filament, dense at apex, 

 more sparse downward past the middle ; anthers purple, dehiscent 

 through the junction of the cells but not explanate. 



A well marked species easily recognized by its compactly 

 bunched stems, its striking root system and its very numerous, 

 small, uniform leaves. Habitat, gravelly hillsides. 



Type specimens in Herb. University of Wyoming, no. 2962, 

 Evanston, May 28, 1897 ; no. 3089, Point of Rocks, June I, 1897- 



Pentstemon arenicola. 



Perennial from long vertical branched woody rootstocks, 

 from the crown of each branch one to several simple stems, 2-3 

 dm. high ; entire plant glabrous and stem leaves somewhat glau- 

 cous ; lower leaves petioled, oblanceolate to broadly spatulate ; 

 middle stem leaves spatulate, tapering into a margined petiole 

 4-5 cm. long ; upper stem leaves sessile by a broad base, trom 

 narrowly oblong to lanceolate, abruptly acute or apiculate, 3-4 

 cm. long ; inflorescence short, spiciform, leafy below, the upper 

 bracts short, ovate-lanceolate ; sepals broadly laneeolate, slightly 

 scarious, one-fourth the length of the corolla-tube ; corolla tubular 

 or but slightly inflated upwards, blue, 12-15 mm. long, its lobes 

 oval, spreading, 3 mm. long, naked in the throat ; sterile filament 

 equalling the tube, its hooked flattened apex comose, more sparsely 

 hairy down one side for half its length ; anthers dehiscent through 



