scROPHULAiaAt;KAKi'(Fiawo]tT family) 441 



sterile filament moderately hirsute. 



Corolla whjte 44. P. blbidus. 



Corolla-purplisli-blue 45. P. Moffattil. 



Anther-cells with closed saccate base, being dehiscent from the middle 



I only, through their junction at the apex. . ^ 



Corolla scarlet-red , . . 46. P. Bridge^ii. 



Corolla violet-blue or purple. 



Sepals long, lanceolate, acuminate .• 47i P. Kingii. 



Sepals very short, ovate, mucronate , . . . . 48. P. sepalulus. 



1. Pentstemon barbatus Nutt. Gen. 2: 53. 1818. Herbaceous, glabrous, 

 usually tall, 6-18 dm. high: leaves lanceolate or the upper Hnea,r-lanc,eolatf ; 

 the lowest and radical oblong or ovate: corolla strongly bilabiate,, 2.5 cm. long, 

 from light pink-red to carmine; base of the lower lip or throat usually bsa,rdpd 

 with long and loose or sparse yellowish.hairs: sterile filament gl^-brous; ajithers 

 glabrous, not explahate after dehiscence. — Texas to Meiico and nprtW^rd 

 possibly to Colorado. . > 



2. Pentstemon Torreyi Benth. in DC. Prodr, 10: 324. 1846. Very similar 

 to the preceding: stems slender, tall; coroUa scarlet-red, nearly or quite gla- 

 brous in the throat. — Hillsides; central Colorado to Texas and Mexico. 



3. Pentstemon trichander (Gray) Rydb. Bull. Torr.^Bpt. qiub„33: 15i. 

 1906. Closely allied to the two foregoing but lower, the istems from a woody 

 caudex: corolla shorter, scarlet-red: anthers beset with long woolly hairs. — 

 In southwestern Colorado. 



4. Pentstemon Eatonii Gray, Proc. Am. Acad. 8: 395. 1873. Stem-leaves 

 partly clasjiing: thyrsus virgate and strict, the peduncles very short:, corolla 

 obscurely bilabiate, 2.5 cm. long, bright carmine-red, tubular, hardly enlarged 

 at the naked throat: sterile filament sometimes minutely bearded at apex; 

 anther-cells not confluent biit often more or less divergent. — In the Wasatch 

 mountain's and thence to Nevada and Arizona. , 



5; Pentstemon strictus Benth. 1. c. Erect, rather rigid, glabi-ous^qr sub- 

 glaucous, 2-5 dm. high: lowest leaves oblong-spatulate, petioled; the cauhne 

 linear-lanceolate: the thyrsus elongated, narrowly virgate, often som^wji^at 

 secund; pedicels short, seVeral'-flowered: sepals objong-ovate, from obtuse to 

 acute or acuminate, with membranous margin: corolla about 2.5. cm. long, 

 with short narrow tube, abruptly dilated into g, cam,panulate throat , of about 

 the same length as the widely spreading ,Hps: anthers sparsely woolly-pilose; 

 the sterile filament dilated and. nearly or quite naked. (P. strictiformis Rydb. 

 1. c. 31: 642.) — ^Frequent in the foothills; ^yonling to Colorado and Utah. 



6. Pentstemon utahensis (Gray). A.Nels. Bull. Torr. Bot. Club 26: 242. 

 1899. Stems strict, moderately slender, often 10 dm. high: ba^af leJEtyes 

 crowded, long-petioled, narrowly oblong or lanceolate ;,caullne leaves remotie, 

 narrower upward and becoming sessile and nearly linear: thyrsus elongated: 

 sepals ovate-acuminate: corolla blue or viplet-purple, 3-4 cm. long, ventricose- 

 ampliate above.: anthers and sterile filament more or less hirsute; anther cells 

 not confluent. — Wyoming and Colorado and westward. 



7. Pentstemon alpinus Torr. Ann. I(yc. N. Y. 1: 35. 1827. The numerous 

 stems (5-25) from a woody rootstock, stout, assurgent, 2-4 dm. long, ^labrate 

 or puberulent: leaves glaucous or puberulent; root leaves small or none; 

 lower stem leaves spatul^teroblong, 4-7 cm. long, mostly obtuse; upper stem 

 leaves lanceolate, 7-10 cm. long; the learf-like bracts long-acuminate: inflores- 

 cence ■ leafy-bracteate, crowded, 10-15 cm. long; cymes , short-peduncled, 

 3^7-flowered: sepals broadly lanceolate or abruptly , long-acuminate from a 

 broad base, margins scarious: corolla moderately ventricose-ampliate, hardly 

 bilabiate, sparsely white-beardediin the throat, about 3 cm. long, tube proper 

 about one third the total lengtji) lobes rounded, spreading: sterile;, filapaent 

 flattened at apex, moderately yellow-comose or even glabrous; stainens from 

 sparsely short-hirsute toi glaihi;ous;. {P. riparius A. Nels. J. c. 25. "1898; P. 

 oreophilus Rydb. 1. c. 643; P.Bakeri Greene, Pitt. 4: 3l8. 1901 (?).]— Gravelly 

 or sandy banks; on the high plains.and in the mountains of our range. 



8. Pentstemon glaber Pursh, Fl.Am. Sept. 2: 738. 1814. Somewhat 

 glaucous, leafy,: 3-0 dm. high: leaves entire, firm, the basal and lower ones 



