SCKOPHULARIACEAE (fIGWORT FAMILY) 447 



sterile filament bearded down one side. — High alpine region pf the Colorado 

 Rocky Mountains. i>. :i 



37. Pentstemon colUnus A, Nels. 1. c. 25: 279. Cae^pitose, the rootstqcks 

 muoh branched and closely- matted; stems numerous, erect, 2-4 dm. high, 

 puberulentitheir; whole length, glandular upward: root leaves numerous, en- 

 tire, glabrous, elUptic-oblong, acute at both ends, 2-3 cm. Ipng, on slender 

 petioles as long j stem leaves narrow-oblong of spatulate., 2r4 cm. long, passing 

 mto the shorter lanceolate bracts: thyrsus strict, interri^pted, 5-9 cm. long, 

 the whole inflorescence minutely glandular-puberulent ; peduncles 3-5-flowered : 

 sepals broadly lanceolate, scanous-margined, one third as long as the corolla: 

 corolla deep blue, slender-tubular,- the, lobes short, spreading, sparsely hairy 

 in the throat: sterile filament comose on the, fls^ttened apex; anthers dehiscent 

 through the junction of the two cells.-r-Gravelly hills; from Colorado to Mon- 

 tana and Oregon. 



3S. Pentstemon gracilis Nutt. Gen. 2:. 52. 1818. Glabrous or nearly so up 

 to the glandular-pubescent inflorescence; stem slender, 1.5-4.5 dm. high: basal 

 and lower leaves linear-oblong or spatulate, denticulate or entire, 2-8 cm. 

 long, narrowed into margined petioles; upper leaves sessile, linear-lanceolate 

 or the uppermost lanceolate, acuminate, denticulate: thyrsus open, several- 

 many-flowered; pedicels 4h8 mm. long:, calyx-segments lanceolate, acute or 

 acuminate: corolla purple, 1-8-2.5 cm. long, the tube gradually enlarged above, 

 the throat wide open: sterjle filament bearded for about one half its length. — 

 Moist prairies; Colorado to Manitoba and eastward to Minnesota. 



.39.. I Pentstemon radicosus A., Nels. 1. c. 280. Caespitose, the short root- 

 stocks producing an inordinate number of coarsely fibrous roots whiqh form 

 an almost unbreakable tufted mat; stem^ numerous, slender, fascicled, strict 

 and erect, 2-4. dm. high; stems and leaves puberulent, obscurely, glandular 

 upward including the inflorescence: root leaves minute and oblanceolate, or 

 none; stem leaves numerousj ,oblong-linear, short-petioled or sessile, 2-4 cm. 

 long, narrower upward and passing into the linear bracts: thyrsus compact, 

 4^8 cm. long; peduncles about 3-flowered: sepals broadly lanceolate, some- 

 what scarious, about one third the length of the corolla: corolla tubular, dark 

 blue, 14-18 mm. long, the. lower lip longer, very sparsely white-bearded; lobes 

 3-4 mm. long: sterile filament flattened, the short yeUow beard straight, stiff, 

 dense at apex, more sparse downward past the middle; anthers, purple; de- 

 liiscent through the junction of the cells. — In moist swales in desert areas; 

 southrcentral, Wyoming;and adjacenf Colorado and Utah. 



40. Pentstemon Jamesii Benth. in DC. Prqdr.lO: 325. 1846. Finely but 

 very densely pruinose-pubescent throughout, obscurely glandular upwards; 

 steins l-several, ascending or erect, 1-2 dm. high: radical leaves entire or 

 rarely denticulate, numerous, ovate to oblong, obtuse to subacute, 2— 4 cm. 

 long, tapering into stout, somewhat shorter petioles; cauUne entire, narrowly 

 oblong>, 2-5 cm. long: thyrsus leafy-bracteate, dense; bracts narrowly oblong 

 to lifteai;, often longer than the flowers: sepals lanceolate, minutely glandularr 

 pubescent, about as long as the corollavtube, which is gradually inflated into , 

 the ventricosercampanulate throat: corolla about ,2 cm. long, tube shorter 

 than the throat, the rounded lobes subequal, about 5 mm. long, copiously 

 but finely viUpijs on .the lower, lip: sterile filament bearing, a dense tuft of 

 yellow hair at ape^ (which. isi slightly exserted) and somewhat similar pubes- 

 cence for mostrOfiits length:, capsule short,' ovoid, acute, ^t maturity longer 

 than the sepals. (Not P. Jamesii Gray.)^ — Blossoming in spring on the desert 

 bad land areas of .Wyoming and South Dakota. 



41. Pentstemon^ similisA. Nels. 1. c. 548... Stems few to many, slender, 

 leafy, 2-3, dm. high, glabjate to finely; and somewhat sparsely pruiiipse- 

 pubescent: radical leaves mostly short-petioled, narrowly oblancejolate, 3-7 

 cm. long (including the petiole), mostly entire; stem leaves sparsely denticu- 

 late, narrowly oblong. to linear, 2-5 cm. Jong, passing into the small entire 

 bracts: thyrsus narrow, somewhat glandular-pubescent, inclined to be secund: 

 sepals broadly lanceolate, shorter than the corolla-tube :i corolla about 2.5 cm. 

 long, sparsely long-hairy within; the tube 8-10 mm. long, abruptly dilated 



