222 SCROPHULARIACEAE. 



Pentstemon pinetorum Piper. Tall, 60-100 cm. high, with several stems 

 from horizontal rootstocks; stems usually glabrous or nearly so; radical leaves 

 ovate or elliptic, mostly entire, acute, glabrous, thickish and evergreen; the 

 blades 1-7 cm. long, attenuate into a petiole as long or longer; cauline leaves 

 3-5 pairs, the lower pairs oblong or broadly spatulate, the upper decidedly 

 ovate, all sessile, obtuse or acute, more or less dentate; inflorescence a more 

 or less glandular-viscid panicle of 4-8 whorled clusters; calyx-lobes ovate, 

 acuminate, usually decidedly glandular; corolla bright blue, varying to pink 

 and pale yellow. Kamiack Butte, Cedar Mountain and Craig Mountains, 

 Idaho. 



Pentstemon erianthera Pursh (P. cristatus Nutt.) Pubescent or puberulent 

 below, the inflorescence glandular; stems several from a woody base, 20-30 cm. 

 high; radical leaves spatulate-oblanceolate, acute, mostly dentate, 5-10 cm. 

 long; cauline ovate-lanceolate, clasping at base; panicle narrow, interrupted; 

 peduncles and pedicels short; sepals broadly lanceolate, acute; corolla bright 

 blue, somewhat funnelform, 15-20 mm. long, glandular-pubescent outside, 

 the throat sparsely bearded; sterile filament bearded with long yellow hairs. 

 Gravelly soil about Spokane. 



Pentstemon deustus Dougl. Wholly glabrous below the inflorescence but 

 not glaucous; stems leafy, erect, tufted, 20-40 cm. high, from a woody base; 

 lowest leaves oblanceolate, petioled, the cauline lanceolate, acute, irregularly 

 dentate, sessile by broad bases, 2-5 cm. long; panicle narrow, leafy below, 8-20 

 cm. long; peduncles mostly short, several-many-flowered; sepals lanceolate- 

 ovate, acuminate, slightly margined, sparsely glandular; corolla white or 

 yellowish, minutely viscid-glandular, 10-15 mm. long, narrowly funnelform, 

 2-lipped; anthers dehiscing their whole length; sterile filament naked. Rocky 

 places in the lower valleys. 



Pentstemon attenuatus Dougl. Differs from P. conferlus only in its 

 larger corolla, 10-20 mm. long, usually yellow, sometimes blue. Kamiack 

 Butte; Blue Mountains; Craig Mountains, Idah> . 



Pentstemon procerus Dougl. Very similar to P. confertus but the flowers 

 blue and usually a little smaller. Common, usually in moist ground, 



Pentstemon confertus Dougl. Glabrous throughout but not glaucous; 

 stems erect, commonly 30-40 cm. high; leaves all entire; the radical oblong, 

 lanceolate or oblanceolate, acute or obtuse, 3-6 cm. long, attenuate at the 

 base into a petiole; the cauline similar, sessile, the upper often ovate, acuminate; 

 panicle strict, narrow, leafy below, 14-40 cm. long, of 2-8 whorl-like clusters; 

 flowers 6-10 mm. long; sepals glabrous, the scarious margin irregularly dentate 

 or erose, about as long as the capsule; corolla yellow or nearly white, 2-lipped; 

 lower lip bearded ; anthers dehiscing their whole length ; sterile filament bearded. 

 Common. 



Pentstemon glandulosus Lindl. Pubescent and glandular throughout; 

 stems 50-100 cm. high; radical leaves ovate-lanceolate, acute, dentate, nar- 

 rowed at base into a petiole, 10-15 cm. long; cauline similar but sessile, the 

 upper cordate-clasping; panicle interrupted, leafy below; lower peduncles 

 2-4 cm. long, the upper ones short; sepals ovate, acuminate, 6-8 mm. long; 

 corolla dull-purple, funnelform, dilated in the throat, shortly 2-lipped, 25-30 

 mm. long, pubescent outside; anthers dehiscent at apex, the base sac-like; 

 sterile filament glabrous. Snake River Bluffs near Lewiston and Craig 

 Mountains, Idaho. 



Pentstemon venustus Dougl. Glabrous; stems tufted, erect, 40-60 cm. 

 high; leaves oblong-lanceolate to ovate-lanceolate, closely serrate, 4-5 cm. 

 long; panicle narrow; peduncles 1-3-flowered; calyx very small, the sepals 

 ovate, acute or acuminate; corolla funnelform, bluish-purple, 2.5-3 cm. long, 

 the lobes ciliate; stamens sparsely pilose above. Common in the Blue Moun- 

 tains; also in the Craig Mountains and along the Potlatch River, Idaho. 



