Studies on the Rocky Mountain flora — XX 



Per Axel Rydberg 



Phacelia nervosa sp. no v. 



Phacelia alpina Rydb. Fl, Colo. 283, in part, as to the Colo- 

 rado specimens. 1906. 



Perennial, with a short rootstock ; stems decumbent at the 

 base, i~3 dm. high, more or less hirsute and with short grayish 

 hairs intermixed ; lower leaves with petioles 2—y cm. long, simple 

 or with a pair of smaller lobes on the petioles ; blades lanceolate, 



■ 



2-5 cm. long, acute, hirsute on both sides, veins rather strong 

 beneath ; upper leaves subsessile ; inflorescence soon open ; the 

 racemes peduncled, in fruit 4—9 cm. long ; calyx more or less 

 tinged with purple, about as long as the corolla ; sepals narrowly 

 linear, acute, hirsute, with a strong midrib ; corolla white or nearly 

 so, pubescent, about 5 mm. long ; filaments about twice as long as 

 the corolla, slightly bearded at the base with short hairs ; seeds 

 lance-ovdid, 2.5 mm. long, brown, faveolate. 



This was mistaken for Phacelia alpina^ which it resembles in 

 habit, but it differs in the longer and more open racemes, the longer 

 calyx-lobes, which about equal the corolla and have a strong 

 midrib, in the almost glabrous filaments, in the whitish instead of 

 lilac corolla, and in the more acute seeds. It grows on high 

 mountains at an altitude of 3000 m. or more. 



Colorado: Silver Plume, Aug. 24, 1895, P. A. Rjdherg 

 (type, in herb. N. Y. Bot. Gard.) ; same locality and date, C. L. 

 Shear 32^3 ; Mt. Harvard, Aug. 17, 1896, C, L, Shear 3^ go ; 

 1896, F, E. Clements ^08 ; near fronton, San Juan County, July, 

 1899, ^' C Curtis. 



Phacelia Burkei sp. nov. 



Perennial, with a taproot; stems 2-^ dm. high, canescent ; 

 basal leaves 3-10 cm, long, petioled ; blades lanceolate, entire, 

 strongly veined, densely white-canescent on both sides ; inflores- 

 cence branched, open ; racemes elongated, 2-8 cm. long ; calyx 

 canescent and hispid-ciliate ; lobes narrowly linear, obtuse, two 

 thirds as long as the corolla, with a lather strong midvein*; corolla 

 pubescent, white, 4-5 mm. long ; stamens about twice as long as 



675 



