CHELONE SCROPHULARIACE.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. nemorosa 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 calyx : 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 expert- 

 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. 42$ (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, of ten 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 



