Rydberg : Studies on the Rocky Mountain Flora 28 



much longer and the beak not spirally twisted. The species may 

 therefore be placed with P. Caiihyi, P. Parryi and P. Hallii, but the 

 corolla and beak are much more arcuate. It is a handsome spe- 

 cies growing at an altitude of nearly 2800 m. 



Wyoming : Big-Horn Mountains, 1899, F. Tweedy, 2J17 (type). 



Pentstemon erosus sp. nov. 



A glabrous cespitose perennial, 2-4 dm. high. Basal leaves 

 oblanceolate, short-petioled, 3-5 cm. long, entire, mostly acute : 

 stem-leaves opposite, sessile, oblong or lanceolate, entire, acute or 

 the uppermost acuminate : flowers in a dense interrupted spikelike 

 inflorescence : calyx-lobes broadly ovate, almost cuspidate-acumi- 

 nate, tinged with dark purple and white and with an erose-dentate 

 margin : corolla purple with very dark limb : lower lip broad with 

 3 rounded reflexed lobes, bearded on the inside : upper lip with 2 

 erect narrower lobes : sterile stamens narrowly clavate, short- 

 bearded. 



This species is nearest related to P. procerus, but easily dis- 

 tinguished by the erose sepals and more reflexed lower lip. It 

 grows at an altitude of 2000-2700 m. 



Colorado: Indian Creek Pass, 1900, F. K. Vreeland, 615 

 (type); South Park, 1^7 1, John [F^^/^r (Wheeler Expedition), 2pj ; 

 Chicken Creek, West La Plata Mountains, 1898, Baker, Earle & 

 Tracy, 6j8. 



Pentstemon Wilcoxii sp. nov. 



An almost glabrous perennial with a cespitose caudex. Stems 

 3-6 dm. high, glabrous or slightly puberulent above, simple : 

 leaves opposite, glabrous and somewhat glaucous, dentate with 

 small sharp callous teeth, acute : the basal ones petioled, lanceo- 

 late : the lower stem-leaves sessile, oblanceolate or oblong, 3-5 cm. 

 long ; the upper lanceolate and slight!)' clasping : inflorescence 

 an elongated interrupted thyrse : branches 1-2 cm. long, fastigiate- 

 cymose : calyx glabrous, about 4 mm. long, cleft }^ its length : 

 lobes lanceolate, acute, slightly margined below and there often 

 sinuately toothed : corolla straight, purple, glabrous on the out- 

 side, about 1 5 mm. long ; the lower lip longer than the upper, 

 slightly bearded within : sterile stamen club-shaped, with a short 

 dense brown beard. 



This species is probably nearest related to P. Jiuinilis ; but 

 easily distinguished by the tall stems, the sharper toothed leaves, 

 and the numerous purple flowers. 



