chelone SCROPHTJLARIACE^E 509 



PENTSTEMON 



purple flowers in dense terminal and axillary spikes or thyrsoid 

 panicles. Calyx 5-parted, bracted at the base, the segments ovate 

 or lanceolate. Corolla irregular, the tube elongated, enlarged 

 above, the limb bilabiate : upper lip concave, emarginate or entire, 

 exterior in the bud : lower lip spreading, 3-lobed. Stamens 5, 

 included, 4 of them antheriferous, didynamous, the fifth sterile 

 and smaller: filaments slender: anthers cordate, woolly. Style 

 filiform: stigma small, capitate. Capsule ovoid, septicidally de- 

 hiscent. Seeds numerous, compressed, winged. 



C. liemorosa Dougl. Lindl Bot. Reg. t. 1211. Glabrous # except the 

 inflorescence which is glandular-pubescent: stems 1-4 feet high, usually 

 simple: leaves ovate to lanceolate, 2-4 inches long, irregularly serrate, 

 acute or acuminate, often subcordate. on very short petioles : flowers pedi- 

 celled, in a loose terminal panicle: bracts and sepals pubescent, lanceolate, 

 acuminate, the latter 3-4 lines long : no bractlets under the caiyx : corolla 

 violet-purple, 12-16 lines long, with wide open mouth, very short 2-cleft 

 and not at all fornicate upper lip and 3-lobed spreading lower one, the 

 lobes broad and rounded, the ample throat glabrous: antheriferous fila- 

 ments glabrous, the sterile one slender-subulate and bearded on the upper 

 side near the apex: anthers densely woolly: capsule ovoid, half inch long 

 or more. On rocky banks along mountain streams, Brit. Columbia to 

 California. 



8 PENTSTEMON Soland. in Ait. Hort. Kew. iii, 511. (1789.) 



Perennial herbs with opposite leaves and purple, blue white, 

 red or yellow flowers in terminal thyrses panicles or racemes. 

 Calyx 5-parted, the segments imbricated. Corolla irregular, with 

 ample throat, not gibbous anteriorly, and bilabiate limb: the 

 upper lip 2-lobed ; the lower one 3-lobed. Stamens 5, not exsert- 

 ed, 4 of them antheriferous and didynamous, the other sterile and 

 as long as or shorter than the others. Anther-cells either united 

 or confluent at the apex. Style filiform, with small entire stigma. 

 Seeds numerous, angled but not winged. 



§ 1 Eupentstemon Gray Proc. Am. Acad, vi, 57. Anther- 

 cells soon divaricate or divergent, united and often confluent at 

 the apex, dehiscent for nearly or quite their whole length. 



* Low and suffruticose with coriaceous leaves : anthers densely 

 woolly with long soft hairs, at length peltately explanate. 



P. Lewisii Benth. in DC. Prodr. x, 321. (1846.) P. Menziesii Gray 

 in part, Gerardia fruticosa Pursh. Fl. 423 (1814.) Glabrous or more or 

 less cinereous : a tufted shrub 1-2 feet high with lateral leafy branches, the 

 central ones bearing peduncled racemes : leaves thick, ovate or obovate to 

 oblong, 6-12 lines long, serrate, the lower short-petioled : inflorescence ra- 

 cemes; the peduncles almost all 1-flowered : sepals lanceolate, often acu- 

 minate: corolla lilac-purple, an inch or more long, tubular-funnelform and 

 moderately bilabiate : stamens rather deeply included : sterile filament 

 long and glabrous. Arid mountain tops, eastern Washington to Brit. 

 Columbia and Montana. 



P. Menziesii Hook. Fl. ii, 98. Glabrous or more or less pubescent: 

 a low densely matted prostrate shrub with lateral leafy branches, part of 

 which bear erect flowering shoots 2-6 inches high : leaves thick, 3-10 lines 



