344 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Nearest related to P. cyananthus, differing mainly in the short 

 calyx and the broad and strongly scarious calyx-lobes. The follow- 

 ing specimens are in the herbarium of the College of Pharmacy, 

 New York. 



Yellowstone Park : Mammoth Hot Springs, 1884, Tzueedy, §2. 



Colorado : Sierra Majado, 1874, ^- ^' Brandegee (type). 



Pentstemon cyananthus Hook. Bot. Mag. 44.64.; Penistcmon gJaber 



cyananthiis Gray, Proc. Am. Acad. 6 : 60 [Syn. Fl. 2' ; 263 ; Man. 



R. M. 275]. 



Characterized by its subcordate stem-leaves and long-acuminate 

 calyx-lobes. At an altitude of about 2000 m. 



Montana: Pleasant Valley, 1871, G. N. Allen (Hayden Survey). 



* Pentstemon glaber speciosus (Dougl.) ; P. spcciosus Dougl. in 



Lindl. Bot. Reg. lyzo. 



Taller and more slender than the species, the inflorescence rriore 

 lax, and the upper leaves much diminished. Mountain sides, at an 

 altitude of 2000-3000 m. 



Montana: Cliff Lake, July 27, 1897, Rydhcrg d- Bessey, 4pii. 



Yellowstone Park : Mammoth Hot Springs, 1894, ^- ^• 

 Biirglehaus; 1888, Dr. Chas. H. Hall; 1884, Tweedy, ^2 : 1885, 

 86i. ' ' 



Idaho: Mount Chauvet, July 29, 1897, Rydhei'g & Bcssey, 4gi2 

 and 4^13 (the latter a monstrosity with poh'petalous corolla). 



Pentstemon acuminatus Dougl. ; Lindl. Bot. Reg. 1283 [111. Fl. 3: 

 154; Syn. Fl. 2': 263; Bot. Cal. i: 559; Man. R. M. 275]. 

 Dry hills and plains, up to an altitude of 2000 m. 

 Montana: Beaver Head Co., 1888, Tzveedy, yi ; Deer Lodge, 

 1888, F. W. Traphag-cn; Great Falls, 1886, B. S. Williams; Gal- 

 latin Co., Mrs. Mary L. Alderson ; Bozeman, 1892, W. T. Shaw; 

 Custer Co., Mrs. Ligiit ; Bozeman, 1883, Scribner, 1S4. 



* Pentstemon saltans. 



Stems 2-4 from a perennial root, 2-3 dm. high, finely 

 puberulent, terete, often tinged with brown ; basal leaves obovate, 

 about 5 cm. long, entire or somewhat toothed, light green and rather 

 firm ; stem-leaves opposite, oblanceolate, oblong or lanceolate, the 

 lower with winged petioles, the upper sessile, all firm, light green, 

 entire at the base, the upper part dentate with salient sharp teeth ; 



