346 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Taller than P. procerus and with ochroleucous or sulphur-yellow 

 flowers. Moist ground, up to an altitude of 2000 m. 



Montana: Helena, F. D. Kelscy ; Sun River Canon, 1887, R. 

 S. Williams, 6g'j ; Trout Creek, 1891, 81^ ; 1892, Miss Emma Ware; 

 Columbia Falls, Mrs. J. J. Kennedy, 5/; Big Hole Valley, 1880, 

 Watson. 



Pentstemon procerus Dougl. ; Graham, Edinb. N. Phil. Jour. 1829: 

 348 ; Hook. Bot. Mag. 2954 ; Pentstemon confertiis coertileo-pur- 

 ■puretis Gray, Proc. Am. Acad. 6: 72 [Syn. Fl. 2': 267; Bot. 

 Cal. i: 560; Man. R. M. 276]. 



Montana: Helena, 1889, F. D. Kelsey ; Haystack Peak, 1887, 

 Tweedy, 57 ; Little Belt Mts., 1896, Flodman, y62 ; Spanish 

 Basin, ydj and yS^; Bozeman, ydj ; Helena, 1891, F. D. Kelsey; 

 Silver Bow Co., Mrs. Jennie H. Moore; Lake Plateau, 1897, 

 P, Koch, jj ; Sun River, 1887, P. S. Williams, 6gy ; Trout Creek, 

 81^; Litde Belt Mts., 1883, Scribner, 186; Beaver Head Co., 

 1888, Txveedy, 7/ ( with short scarious-margined calyx-lobes ) ; 

 Missoula, 1880, Watson. 



Yellowstone Park: Mammoth Hot Springs, 1884, Tzceedy, jo; 

 1883, Mary Compton. 



* Pentstemon Rydbergii A. Nelson, Bull. Torr. ]5ot. Club, 25: 281. 



Resembles somewhat the preceding, but is a taller plant, about 

 3 dm. high, with a narrower corolla. In habit it more resembles P. 

 confertus, but has a blue, not yellow, corolla. The sepals are scari- 

 ous-margined. 



Montana: Plains and vallevs near Flathead Lake, 1883, Canby^ 

 252. 



* Pentstemon micranthus Nutt. Journ. Acad. Phila. 7: 45. 



Like the last, but with a still narrower corolla, 8 mm. long, the tube 

 about 2 mm. in diameter, the limb 5 mm. wide ; leaves linear or lin- 

 ear-oblanceolate. 



Montana: Rocky Mountains, Wyeth. 



* Pentstemon pseudoprocerus. 



Perennial with a woody caudex, perfectly smooth up to the glan- 

 dular-pubescent inflorescence ; stems about 2 dm. high, simple ; 

 basal leaves spatulate or oblanceolate, 3-5 cm. long, entire ; stem- 

 leaves similar or the upper lanceolate, acuminate or acute ; inflores- 

 cence interrupted-spicate, more or less distinctly verticillate ; calyx 



