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, acutcy 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.iGard. 

 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 Braridegei Porter, Fl. Col. 91. 1874. Leaves 

 thick, coriaceous; the upper cordate-ovate, clasping, ciUate 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 spatula te: 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; pedimcles 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. crassifolius Benth.) — Western 

 Wyoming and Montana and far westward. i . i , ,. 



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 cauhne closely sessile: thyrsus virgate 

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

 sepals ovate to lanceolate, nearly marginless: corolla oohroleucous 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 uniUteralis Rydb. Bull. Torr. Bot. Club 33: 150. 1906. 

 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: coroUa with narrow 



