Pentstemon. SCROPHULARIACEiE. 2T1 



++ -H- ++ ++ Leaves pinnately parted into narrowly linear divisions ! 



P. dissectus, BU. Merely puberulent : stem slender, 2 feet high : leaves in rather dis- 

 tant pairs; radical and lowest not seen; upper with 7 to 11 obtuse entire divisions, of 

 barely half line in width, on a rhachis of equal breadth : thyrsus long-pedunoled, umbelli- 

 form or triradiate, few-fiowered : pedicels slender: sepals ovate-oblong: corolla "purple," 

 9 lines long; oblong-f unnelforra ; the limb obscurely bilabiate : sterile filament bearded at 

 the apex. — Sk. i. 129 ; Gray, 1. c. — Middle Georgia, " Jackson," Darby. 



§ 2. Saccanthera, Benth. Anthers sagittate or horseshoe-shaped ; the cells 

 confluent at the apex, and there dehiscent by a continuous cleft, which extends 

 down both cells only to the middle ; the base remaining closed and saccate, some- 

 times hirsute, never lanate. Pacific-States species, herbaceous or some rather 

 woody at base, mostly with ample and showy flowers. 



* Soft-pubescent and viscid, with broad and thinnish leaves mostly serrate or denticulate. 

 P. glandulosus, Lindl. Stem rather stout, 2 or. 3 feet high: radical leaves ovate or 

 oblong, (3 or 8 inches long, dentate : cauline from cordate-clasping to ovate-lanceolate, 

 acuminate, usually denticuUite or few-toothed : thyrsus contracted and interrupted, 

 leafy below : cymes short-pedunculate, few-several-flowered : sepals attenuate-lance- 

 olate, lax : corolla lilac, over an inch long, with funnelforra-inflated throat, and rather short 

 broad and spreading lips: sterile filament glabrous. — Bot. Reg. t. 1202; Hook. Bot. Mag. 

 t. 3868 ; Benth. in DC. Prodr. x. 330 ; Gray in Proc. Am. Acad. vi. 74. P. staticifolius, 

 Lindl. Bot. Keg. t. 1770. — Mountain woods and along streams, Oregon and Washington 

 Terr, to Idaho. 



* * Glabrous or merely puberulent: leaves serrate, incisely dentate, or sometimes laciniate : sterile 

 filament more or less hairy above : corolla fiuuielform and moderately bilabiate, lilac, purple, or 

 light violet, 



•1— Over an inch long : cah'x remarkablj' small. 

 P. venustus, Dougl. Very glabrous : stems rather strict and simple, a foot or two 

 high, leafy : leaves thickisli in texture, oblong-lanceolate or the upper ovate-lanceolate, 

 closely and subulately serrate (about 2 inches long): thyrsus naked, mostly narrow : pe- 

 duncles l-.3-flowered : sepals ovate, acute or acuminate, only a line or two long, much 

 shorter than the proper and narrow tube of the corolla : upper part of fertile filaments 

 and of the sterile one (as also usually anthers and lobes of the corolla within) sparsely 

 pilose. — Lindl. Bot. Reg. t. 1309; Benth. 1. c; Gray, 1. c. P. amamus, Kunze in Linn, 

 xvi. littbl. 107? — Oregon and Idaho. 



-)— -i— Corolla barely or less than an inch long: calyx and pedicels mostly puberulent or viscid- 

 glandular: stems (a foot or two high) ascending or "diffuse: thyrsus paniculate. 



P. difflisus, Dougl. Leaves from ovate to oblong-lanceolate, or the upper subcordate, 

 sharply and unequally and sometimes laciniately serrate (H to 4 inches long): thyrsus 

 commonly interrupted and leafy : pedicels mostly shorter than the ovate or lanceolate and 

 acuminate (sometimes laciniate-toothed) sepals: corolla three-fourths inch long: anthers 

 glabrous: sterile filament villous-bearded above. — Lindl. Bot. Reg. t. 1132; Hook. Bot. 

 Mag. t. 3645 ; Gray, 1. c. P. serrulatus, Menzies in Hook. Fl. ii. 95. P. argntus, Paxt. Mag. 

 Bot. vi. 271, appears to be a form of this, connecting with the next species. — Wooded or 

 rocky banks, Oregon to Brit. Columbia. 



P. Richardsonii, Dougl. Stems often loosely branching: leaves ovate- to narrowly 

 lanceolate in outline, from incised to laciniate-pinnatifid ; the upper commonly alternate 

 or scattered : thyrsus loosely panicled : sepals (ovate or oblong) and pedicels often gland- 

 ular and viscid : corolla three-fourths to an inch long : sterile filament sparingly villous- 

 bearded at apex. — Lindl. Bot. Reg. t. 1121 ; Hook. Bot. Mag. t. 3391 ; Lodd. Bot. Cab. t. 

 1641. — Bare rocks, &c., Oregon and Washington Terr. 



P. triphyllus, Dougl. Stems slender, about a foot high, usually simple: cauline 

 leaves lanceolate or linear (an inch or so long), rigid, from denticulate to irregularly pin- 

 natifid-laciniate ; the upper sometimes ternately vcrticillate, sometimes alternate: thyrsus 

 narrow, loosely paniculate : sepals lanceolate, acuminate : corolla comparatively small and 

 narrow, half to two-thirds inch long: sterile filament densely bearded at apex. — LindL 

 Bot. Reg. t. 1245; Benth. in DC. Prodr. 1. c. — Rocks, &c., Oregon to British Columbia. 



