442 SCROPHULARIACEAE (FIGWORT FAMILY) 



narrowed into petioles, the upper oblong or oblong-lanceolate, acuminate: 

 thyrsus narrow, elongated; pedicels 6-14 mm. long in fruit: calyx-segments 

 ovate-lanceolate, scarious-margined, abruptly acuminate, 6-8 mm. long: 

 corolla blue or purple, rather abruptly expanded above the calyx, the limb 

 somewhat 2-lipped, the lobes rounded : sterile filament bearded at the slightly 

 enlarged summit: capsule narrowly ovoid, acute, about twice as long as the 

 calyx. Moist sandy soils; from Dakota and Nebraska through our range 

 and far westward. 



8a. Pentstemon glaber speciosus (Dougl.) Rydb. Mem. N. Y. Bot. Card. 

 1: 344. 1900. Taller and more slender than the species, the inflorescence 

 more lax, and the upper leaves much diminished. (P. speciosus Dougl.) 

 Mountain sides; from northwestern Wyoming to Washington. 



9. Pentstemon cyananthus Hook. Bot. Mag. pi. 4464. Closely allied to the 

 foregoing but usually taller and the stems more slender: leaves all broad; the 

 cauline ovate, or subcordate and ovate-lanceolate: thyrsus dense: sepals nar- 

 row or long-acuminate: corolla bright blue: anthers and sterile filament from 

 hirsute to nearly glabrous. In the foothills of the high plains of Colorado, 

 Wyoming, and Utah. 



9a. Pentstemon cyananthus Brandegei Porter, Fl. Col. 91. 1874. Leaves 

 thick, coriaceous; the upper cordate-ovate, clasping, ciliate on the margins: 

 cymes 6-8-flowered: corolla abruptly ventricose-campanulate, azure blue or 

 paler: sterile filament scantily bearded. Reported from Colorado by Bran- 

 degee only. 



10. Pentstemon Fremontii T. & G. Proc. Am. Acad. 6: 60. 1866. Stems 

 1-2 dm. high, minutely and densely pruinose-pubescent : cauline leaves 

 lanceolate or the lowest and radical spatulate: thyrsus spiciform, virgate, 

 rather densely flowered: sepals oblong-ovate, acute, with irregular scarious 

 margins: corolla very obscurely bilabiate, funnelform, 15-18 mm. long, with 

 throat but little dilated: anthers hirsute; sterile filament with dilated bearded 

 apex. Flowering in June on the Red Desert of Wyoming and the Uintah 

 plains, Utah. 



11. Pentstemon comarrhenus Gray, Proc. Am. Acad. 12: 81. 1877. Slen- 

 der, glaucescent or minutely pruinose-puberulent at least above: basal leaves 

 oblong to oval; the uppermost linear: thyrsus laxly virgate; peduncles and 

 pedicels moderately long: sepals small, oval, rarely more than 3-4 mm. long: 

 corolla about 2.5 cm. long, purplish-blue; the tube proper rather long and 

 narrow: anthers long-woolly. In western Colorado and in Utah. 



12. Pentstemon fruticosus (Pursh) Greene, Pitt. 2: 239. 1892. Stem 

 woody and much branched at base, 2-5 dm. high: leaves oblong, lanceolate, or 

 narrower, entire or toothed, often rather thick, 3-7 cm. long; inflorescence 

 racemose, glandular-pubescent; pedicels usually 1 -flowered: sepals ovate- 

 lanceolate, acuminate: corolla 2.5-3.5 cm. long, of various shades of pink, 

 violet, or purple, tubular-funnelform and moderately bilabiate: sterile fila- 

 ment short and slender; anthers comose. (P. crassifolms Benth.) Western 

 Wyoming and Montana and far westward. 



13. Pentstemon deustus Dougl. Lindl. Bot. Reg. 16: pi. 1318. 1830. Com- 

 pletely glabrous, the calyx at most obscurely granular-pruinose or glandular; 

 stems 1-3 dm. high, in tufts from a woody base, rigid: leaves coriaceous, 

 ovate to oblong-linear or lanceolate, irregularly and rigidly dentate or acutely 

 serrate, or some of them entire; upper cauline closely sessile: thyrsus virgate 

 or more paniculate, mostly many-flowered; peduncles and pedicels short: 

 sepals ovate to lanceolate, nearly marginless: corolla ochroleucous or dull 

 white, rarely with a tinge of purple, 10-12 mm. long, either narrowly or 

 rather broadly funnelform; the short lobes widely spreading. Range of the 

 preceding. 



14. Pentstemon unilateralis Rydb. Bull. Torr. Bot. Club 33: 150. 19t)6. 

 Plants 4-8 dm. high, including the elongated and racemiform. strict, many- 

 flowered, 1-sided thyrsus: cauline leaves narrowly lanceolate, 5-10 cm. long; 

 radical spatulate: peduncles 1-3-flowered: sepals ovate or oblong, acute or 

 obtuse, with somewhat scarious but entire margins: corolla with narrow 



