SCROPHULARIACEAE. 221 



330. PENTSTEMON. Beard-tongue. 



Perennial herbs; leaves opposite, the upper sessile or partly- 

 clasping, the floral reduced to bracts; flowers showy, in a race- 

 mose panicle; calyx 5-parted; corolla tubular, more or less 

 inflated or bell-shaped, either decidedly or slightly 2-lipped; the 

 upper lip 2-lobed, the lower 3-cleft; anther-bearing stamens 4; 

 the sterile fifth filament about equalling the others; style long; 

 stigma entire; capsule many-seeded. 



Anthers woolly. 



Calyx-lobes lanceolate, 5-10 mm. long. P. fruticosus. 



Calyx-lobes subulate-lanceolate, 10-15 mm. long. P. scouleri. 



Anthers not woolly. 



Anther-cells splitting their whole length or nearly so. 



Plants glabrous and more or less glaucous. P. glaber. 



Plants pubescent or glabrous but not glaucous. 

 Leaves or at least some of them dentate. 



Leaves broad, mostly ovate. P. pinetorum. 



Leaves narrow, oblong, lanceolate or oblanceo- 

 late. 

 Corolla blue-purple, 15-25 mm. long. P. erianthera. 



Corolla white, 10-15 mm. long. P. deuslus. 



Leaves entire. 



Flowers 10-20 mm. long. P. altenualus. 



Flowers 6-10 mm. long. 



Corolla blue. P. procerus. 



Corolla pale yellow. P. confertus. 



Anther-cells splitting only at the apex, the bases sac-like. 



Leaves glandular-pubescent. P. glandulosus. 



Leaves glabrous or puberulent beneath, not glandular. 



Inflorescence glandular; corolla 3 cm. long. P. venustus. 



Inflorescence not glandular; corolla smaller. 



Leaves linear or lanceolate; corolla purple, 10-15 



mm. long. _ P. triphyllus. 



Leaves lanceolate to ovate; corolla red, 20-25 



mm. long. P. richardsonii. 



Pentstemon fruticosus (Pursh) Greene. Stems simple, ascending from a 

 branched woody base, 15-40 cm. high; leaves coriaceous, glabrous, lanceolate, 

 oblanceolate or ovate, mostly acute, entire or with a few teeth, narrow at base, 

 the lower short-petioled, 1-4 cm. long; inflorescence a raceme, rarely a panicle, 

 2-11 -flowered, viscid-pubescent; bracts much reduced; sepals ovate-lanceolate, 

 attenuate-acuminate, 8-12 mm. long; corolla tubular-funnelform, dull- 

 purple, somewhat 2-lipped, 3-4 cm. long; anthers very woolly, dehiscing their 

 whole length; sterile filament bearded. In rock crevices in the mountains. 



Pentstemon scouleri Lindl. Differs from P. fruticosus only in its narrower 

 leaves and longer calyx-lobes. Kettle Falls, Douglas; Mount Carlton, 

 Kreager; near Spokane, Miss Reed. 



Pentstemon glaber Pursh. Glabrous throughout and glaucous; stems 

 wholly herbaceous, stout, erect, 30-100 cm. high; leaves entire, the lowest 

 spatulate to oblong-lanceolate, the cauline ovate-lanceolate and sessile, 5-10 

 cm. long; panicle narrow, densely flowered; peduncles and pedicels very short; 

 sepals broad, acute or acuminate, somewhat erose; corolla bright blue, 3-4 

 cm. long, rather abruptly dilated above the short tube; anthers glabrous or 

 with a few hairs; sterile filament naked or slightly bearded. Gravelly soil, 

 Spokane County and in the Blue Mountains. 



