SCROPHULARIACEAE (FIGWORT FAMILY) 447 



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

 Rocky Mountains. 



37. Pentstemon collinus A. Nels. 1. c. 25: 279. Caespitose, the rootsto'cks 

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

 puberulent their whole length, glandular upward: root leaves numerous, en- 

 tire, glabrous, elliptic-oblong, acute at both ends, 2-3 cm. long, on slender 

 petioles as long; stem leaves narrow-oblong or spatulate, 2-4 cm. long, passing 

 into the shorter lanceolate bracts: thyrsus strict, interrupted, 5-9 cm. long, 

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

 sepals broadly lanceolate, scarious-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 flattened apex; anthers dehiscent 

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

 tana and Oregon. 



38. 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 4-8 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: sterile filament bearded for about one half its length. 

 Moist prairies; Colorado to Manitoba and eastward to Minnesota. 



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

 stocks producing an inordinate number of coarsely fibrous roots which form 

 an almost unbreakable tufted mat; stems numerous, slender, fascicled, strict 

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

 upward including the inflorescence: root leaves minute and ob lanceolate, or 

 none; stem leaves numerous, 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 yellow beard straight, stiff, 

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

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

 south-central Wyoming and adjacent Colorado and Utah. 



40. Pentstemon Jamesii Benth. in DC. Prodr. 10: 325. 1846. Finely but 

 very densely pruinose-pubescent throughout, obscurely glandular upwards; 

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

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



)ng, tapering into stout, somewhat shorter petioles; cauline entire, narrowly 

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

 linear, often longer than the flowers: sepals lanceolate, minutely glandular- 

 ibescent, about as long as the corolla-tube, which is gradually inflated into 

 ventricose-campanulate throat: corolla about 2 cm. long, tube shorter 

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

 but finely villous on the lower lip: sterile filament bearing a dense tuft of 

 yellow hair at apex (which is slightly exserted) and somewhat similar pubes- 

 cence for most of its length: capsule short, ovoid, acute, at 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 similis A. Nels. 1. c. 548. Stems few to many, slender, 

 leafy, 2-3 dm. high, glabrate to finely and somewhat sparsely pruinose- 

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

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

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

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

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

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



