Pentstemon. SCROPHULARIACEiE. 271 



++++++++ Leaves pinnatety parted into narrowly linear divisions ! 

 P. dissectus, Ell. 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-peduncled, umbelli- 

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

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

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



§ 2. Saccanth^ka, 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, 6 or 8 inches long, dentate : cauline from cordate-clasping to ovate-lanceolate, 

 acuminate, usually denticulate 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 f unnelform-inflated throat, and rather short 

 broad and spreading lips : sterile filament glabrous. — Bot. Reg. t. 1262 ; Hook. Bot. Mag. 

 t. 3688; Benth. in DC. Prodr. x. 330; Gray in Proc. Am. Acad. vi. 74. P. staticifolius, 

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

 Terr, to Idaho. 



# * Glabrous or merely puberulent : leaves serrate, incisety dentate, or sometimes Iaciniate : sterile 

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

 light violet, 



-I— Over an inch long : calyx remarkably small. 



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

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

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

 duncles 1-3-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. u. ; Gray, 1. c. P. ammnus, 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. diffusus, Dougl. Leaves from ovate to oblong-lanceolate, or the upper subcordate, 

 sharply and unequally and sometimes laciniately serrate (1| 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. argutus, 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. triph^llus, 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 verticillate, 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. 



