i9i a] NELSON— IDAHO PLANTS 147 



Twilight Gulch, Owyhee County, June 23, 1911, and his no. 1693, Pinehurst, 

 Boise County, August 17, 191 1. 



Pentstemon laxus, n. sp. — Minutely puberulent on stems and 

 foliage, the pedicels and calyx wholly glabrous: stems solitary or 

 few, from a compact mass of thick fibrous roots, slender and weak, 

 5-8 dm. high: leaves 6-9 pairs, not much reduced above, lanceolate- 

 linear, 5-10 cm. long: flowers in a crowded subcapitate terminal 

 cluster on a peduncle 6-12 cm. long and naked but for 1 or 2 pair 

 of linear approximate bracts; besides the terminal cluster there are 

 rarely produced from the axils of the upper leaves a pair of small 

 pedicellate clusters: calyx short, cleft to the base; its lobes broadly 

 obovate, obtuse, slightly erose, scarious with greenish center espe- 

 cially toward the tip, only 2-3 mm. long or about one-fifth as long 

 as the corolla: corolla a vivid blue, narrowly tubular and only 

 slightly dilated upward, 2-lipped, but the lips short, the longer 

 lower lip densely bearded with long yellow hair; the lobes all very 

 short, suborbicular: stamens glabrous, shorter than the corolla: 

 sterile filament shorter than the fertile, not dilated, blue at tip, 



tapering and flexed at the very apex, glabrous or with 1-7 deciduous 

 hairs. 



This is probably not a very strong species, but it seems fully as distinct 

 from any Pentstemon previously discussed as any two of them are from each 

 other. Further, if made merely a variety it would be difficult to say to which 

 one to unite it. 



It was found on slopes in rich sagebrush lands. Nelson and Macbride, 

 no. 1 196, Ketchum, July 19, 191 1. 



Pentstemon linarioides seorsus, n. var. — Very similar to 

 P. linarioides Gray (Bot. Mex. Bound. 112), from which it differs 

 primarily as follows: 



Larger in every way, the rootstock notably woody : calyx green 

 and only half as long as the corolla; its lobes ovate, abruptly acute, 

 thick and green at tip, slightly scarious below: corolla glabrous in 

 the throat: the sterile filament longer than the fertile ones and 

 densely pubescent with short yellow hairs for its whole length. 



At first it seemed impossible that these specimens from southwestern Idaho 

 should be referable to a species so long known only from southern Colorado, 

 New Mexico, and Arizona, and the above characters led to their being desig- 



