268 SCROPHULARIACEyE. Pentstemon. 



draceous, lilac-purple or sometimes whitish, three-fourths to nearly an inch long; the 

 throat open. Gen. ii. 52; Graham in Bot. Mag. t. 2945; Lodrl. Bot. Cab. t. 1541; Benth. 

 1. c. P. pubescens, var. yraciUs, Gray, Proc. 1. c. partly. Saskatchewan to Wyoming, and 

 south in the mountains to Colorado. Intermediate between the preceding and following: 

 distinguished from slender forms of the latter by the open mouth and nearly terete throat 

 of the narrow corolla. 



P. pubescens, Solander. Stem a foot or two high, viscid-pubescent, or sometimes 

 glabrous up to the inflorescence: cauline leaves from oblong to lanceolate (2 to 4 inches 

 long), usually denticulate ; the lowest and radical ovate or oblong: thyrsus loosely-flow- 

 ered, mostly naked, narrow : flowers drooping : corolla dull violet or purple, or partly 

 whitish, an inch long, very moderately dilated above the short proper tube, carinate- 

 angled for the whole length of the upper and deeply plicate-bisulcate on the lower side, 

 the upper part of the intrusive portion villous-bearded and forming a sort of palate ; orifice 

 crescentic or almost closed ; the lips and their lobes short : sterile filament densely bearded 

 far down. Ait. Kew. ii. 300; Sims, Bot. Mag. t. 1424; Gray, I.e. excl. syn. P. Icevlgatns. 

 Chelone hirsuta, L. C. Pentstemon, L. Mant. 415. Asariiia caule erecto, &c., Mill. Ic. t. 152. 

 Peiitstenwn hii-aiitns, Willd. Spec. iii. 227. P. Mackyanus, Knowles in Fl. Cab. ii. 117, t. 74. 

 P. lonrjifoliiis, Scheele in Linn. xxi. 704 ? Dry or rocky grounds, from Canada to Iowa and 

 south to Florida and Texas. 



P. laevigatus, Solander, 1. c. Mostly glabrous up to the glandular inflorescence : 

 stem 2 to 4 feet high : leaves of firmer texture and somewhat glossy ; cauline ovate- or 

 oblong-lanceolate with subcordate-clasping base, 2 to 5 inches long: thyrsus broader: 

 corolla about an inch long, white and commonly tinged with purple, abruptly campanulate- 

 inflated above the proper tube, more or less obliquely ventricose, obscurely angled down 

 the upper side, not at all intruded on the lower; orifice widely ringent, sparingly slender- 

 bearded at base of the lower lip : sterile filament thinly bearded above. Sims, Bot. Mag. 

 t, 1425; Miclix. Fl. ii. 21; Pursli, Fl. ii. 427. CMone Pentstemon, L. Spec. ed. 2, 850, excl. 

 syn. Arduin, Moris. &c. ; Lam. 111. t. 528. P. pubescens, var. multiflorus, Benth. in DC. 1. c. 

 (P. Diijitulis, var. multi floras, Chapm.) ; a small-flowered and small-fruited form, answering 

 to the figure by Lam. P. glaucophyllus, Scheele in Linn. xxi. 763? Moist or rich soil, 

 Penn. to Florida and westward, where the commoner form is 



Var. Digitalis. Stem sometimes 5 feet high : corolla larger and more abruptly in- 

 flated, white. P. Dli/itdlis, Xutt. in Trans. Am. Phil. Soc. n. ser. v. 181 ; Reichenb. Exot. 

 v. t. 292 ; Hook. Bot. Mag. t. 2587 ; Benth. in DC. 1. c. 327 ; Gray, Man. ed. 5, 328. Chelone. 

 Digitalis, Sweet, Brit. Fl. Gard. t. 120. Penn. to Illinois, Arkansas, &c. 



P. glauGUS, Graham. Glabrous up to the inflorescence, more or less glaucous : stems 

 dwarf or ascending, a span to a foot high : leaves thickish, oblong-lanceolate or the radical 

 oblong-ovate (one or two inches long), entire or denticulate: thyrsus short and compact, 

 either simple or compound, villous-pubescent and viscid or glandular : corolla dull lilac or 

 violet-purple, less than an inch long, campnnulatc-ventricose above the very short proper 

 tube, gibbous, not at all plicate-sulcate ; the orifice widely ringent; the broad lower lip 

 sparsely villous-bearded within : sterile filament bearded mostly at and near the apex only. 

 -Edin'b. Phil. Jour. 1829, 348; Lindl. Bot. Reg. t. 1280; Gray, Proc. 1. c. P. ylaber, var. 

 stenosepalns, Regel in Act. Petrop. iii. 121 1 Rocky Mountains north of 49 (Drummond) to 

 Wyoming and Utah ; southward, chiefly in the form of 



Var. stenosepalus, Gray, 1. c. Sometimes over a foot high : thyrsus compara- 

 tively small and glomerate : sepals attenuate-lanceolate: corolla dull whitish or purplish. 

 Mountains of Colorado and Utah near the upper borders of the wooded region. 



= = Sterile filament bonnlless (rarely with a few minute short hairs), sometimes completely 

 antheriferous in certain flowers. 



P. W^hippleanus, Gray. Glabrous up to the inflorescence or nearly so: stems slender, 

 a foot long, ascending from a decumbent base, leafy : leaves membranaceous, ovate or 

 ovate-oblong, entire or repand-denticulate, acute or acuminate, commonly 2 inches long; 

 lower petioled; upper cauline closely sessile or partly clasping by a broad base: thyrsus 

 loosety few-flowered: peduncles 2 to 5, slender, 2-3-flowered : pedicels and the narrowly 

 linear-lanceolate lax and attenuate sepals villous, somewhat viscid: corolla an inch long, 

 campanulate-ventricose above the short proper tube, decidedly bilabiate ; the lower lip 

 longer than the nearly erect 2-lobed upper one, sparsely long-bearded within: sterile fila- 



