SCROPHULARIACEAE (FIG WORT FAMILY) 441 



Sterile filament moderately hirsute. 



Corolla white 44. P. albidus. 



Corolla-purplish-blue 45. P. Moffattii. 



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

 only, through their junction at the apex. 



Corolla scarlet-red 46. P. Bridgesii. 



Corolla violet-blue or purple. 



Sepals long, lanceolate, acuminate . ' '' * ' . 47. 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 linear-lanceolate; 

 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 bearded 

 with long and loose or sparse yellowish hairs: sterile filament glabrous; anthers 

 glabrous, not explanate after dehiscence. Texas to Mexico and northward 

 possibly to Colorado. 



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

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

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



3. Pentstemon trichander (Gray) Rydb. Bull. Torr. Bot. Club 33: 151. 

 1906. Closely allied to the two foregoing but lower, the stems 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 clasping: 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 but often more or less divergent. In the Wasatch 

 mountains and thence to Nevada and Arizona. 



5. Pentstemon strictus Benth. 1. c. Erect, rather rigid, glabrous or sub- 

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

 linear-lanceolate: the thyrsus elongated, narrowly virgate, often somewhat 

 secund; pedicels short, several-flowered: sepals oblong-ovate, from obtuse to 

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

 with short narrow tube, abruptly dilated into a campanulate throat of about 

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

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

 1. c. 31: 642.) Frequent in the foothills; Wyoming 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: basal leaves 

 crowded, long-petioled, narrowly oblong or lanceolate; cauline leaves remote, 

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

 sepals ovate-acuminate: corolla blue or violet-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. Lye. N. Y. 1: 35. 1827. The numerous 

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

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

 lower stem leaves spatulate-oblong, 4-7 cm. long, mostly obtuse; upper stem 

 leaves lanceolate, 7-10 cm. long; the leaf-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-bearded in the throat, about 3 cm. long, tube proper 

 about one third the total length, lobes rounded, spreading: sterile filament 

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

 sparsely short-hirsute to glabrous. [P. riparius A. Nels. 1. c. 25. 1898; P. 

 oreophilusRydbA.c. 643; P. Bakeri Greene, Pitt. 4: 318. 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, 3-6 dm. high: leaves entire, firm, the basal and lower ones 



