Pentstemon. SCROPHULARIACE^. 267 



2. Leaves from oblong or ovate-lanceolate to lanceolate, entire, or some denticulate, glabrous : corolla 

 from a third to two-thirds of an inch in length. 



P. attenuatus, Dougl. Stem strict, a foot or two high ; the summit and inflorescence 

 more or less pubescent and viscid : leaves narrowly oblong to lanceolate, or the upper 

 sometimes ovate-lanceolate : thyrsus of the next species or less compact : sepals ovate- to 

 oblong-lanceolate, acute or acuminate, narrowly scarious-margined, as long as the capsule : 

 corolla narrowly funnelform, over half inch long, ochroleucous, sulphur-yellow, or some- 

 times violet or blue. Lindl. Bot. Reg. t. 1295; Hook. Fi. ii. 97; Benth. I.e. Interior of 

 Oregon, Idaho, &c. No indigenous specimens yet seen accord with the figure, in robust- 

 ness, upper cauline leaves ovate-lanceolate and inch wide, and corolla 9 lines (or according 

 to Bentham 9 to 11 lines) long. The plants referred here verge to the next, but have longer 

 corolla, 6 or 8 lines long. The species is still uncertain. 



P. confertus, Dougl. Glabrous throughout, or the inflorescence and calyx sometimes 

 viscid-pubescent or puberulent, a foot or two high : leaves from oblong or oblong-lanceo- 

 late to somewhat linear, usually quite entire : thyrsus spiciform, interrupted, naked, of 2 

 to 5 verticillastriform dense many-flowered clusters (either subsessile or the lower pedun- 

 cled) : pedicels very short : sepals from oblong-lanceolate to broadly ovate, with broad 

 scarious margins commonly erose or lacerate, rather shorter than the capsule: corolla nar- 

 row, 4 to 5 or rarely 6 lines long, in the typical forms from ochroleucous to sulphur-color ; 

 lower lip conspicuously bearded within. Lindl. Bot. Reg. t. 1260 ; Hook. 1. c. ; Benth. 

 1. c. ; Gray, Proe. Am. Acad. vi. 72. Moist or dry grounds, Northern Rocky Mountains to 

 Oregon. The commoner state is 



Var. CSBruleo-purpureus, Gray, 1. c. A foot or two high, rarely more, or in the 

 higher mountains from 1U down to 2 inches high ; the latter with capituliform inflorescence : 

 sepals very variable, commonly very scarious and erose, sometimes with a long herbaceous 

 acumination : corolla blue-purple and violet. P. procerus, Dougl. ex Graham in Edinb. 

 Phil. Jour. 1829 ; Hook. Bot. Mag. t 2954 ; Lodd. Bot. Cab. t. 1616 ; Benth. 1. c. P. Tol- 

 miei, Hook. Fl. ii. 97. P. micranthus, Nutt. in Jour. Acad. Philad. vii. 45. Saskatchewan 

 and along the Rocky Mountains to Colorado, west to Oregon and through the whole 

 length of the Sierra Nevada, California. 



P. \V^ats6ni. Glaucescent and glabrous throughout, or inflorescence and calyx minutely 

 puberulent, but neither glandular nor viscid : stems a foot or more high, ascending or weak : 

 cauline leaves oblong-lanceolate to ovate-lanceolate, acute or acuminate (1 to 2 inches long, 

 4 to 9 lines wide) : contracted thyrsus rather loose : peduncles several-flowered ; the lower 

 slender : pedicels longer than the calyx : sepals broadly ovate or orbicular with a small acumi- 

 nation, somewhat scarious-margined, little over a line long, barely half the length of the 

 mature capsule : corolla narrowly funnelform, 6 to 8 lines long, violet-purple or partly white ; 

 lower lip almost glabrous within. P. Fremonti, var. Parri/i, Gray ex Watson, Bot. King, 

 218. Mountains of W. Colorado, Utah, and Nevada (Fremont, Parry, Watson, Wheeler, 

 Vasey, Ward, &c.), to borders of Arizona, Palmer. 



P. humilis, Nutt. Stems a span or two high, glabrous or above with the inflorescence 

 and flowers viscid-pubescent: leaves glaucescent, from oblong to lanceolate (an inch or 

 more long) ; the cauline commonly denticulate : thyrsus strict and virgate, 2 to 4 inches 

 long : peduncles (2-5-flowered) and pedicels short : sepals ovate or lanceolate and acuminate, 

 lax : corolla rather narrowly funnelform, half inch long, deep-blue or partly white ; lower 

 lip somewhat hairy within. Gray, Proc. 1. c. ; Watson, Bot. King, 220. Rocky Moun- 

 tains from the British boundary to S. Colorado, and west to the Humboldt Mountains in 

 Nevada. The larger forms may pass into P. yrncilis. 



Var. brevifolius. A low and rather diffuse tufted form, with weak stems : leaves 

 at most half inch in length ; cauline elliptical-oblong; the radical oval or rotund: corolla 

 light blue. P. humilis, var.? Watson, 1. c. Utah, in the Wahsatch Mountains, at 9,000 

 or 10,000 feet, Watson, Eaton. 



3. Leaves from ovate-lanceolate to linear, often denticulate : corolla an inch or three-fourths inch 

 long: cymes of the more or less open thyrsus pedunculate: sepals lanceolate, acute, marginless. 



P. gracilis, Nutt. A foot or less high, glabrous or merely puberulent up to the more or 

 less viscid-pubescent strict thyrsus : stems slender: cauline leaves mostly linear-lanceolate 

 (1 to 3 inches long, the serrations when present very acute or subulate) ; the radical spatu- 

 late or oblong : peduncles 2-several-flowered : corolla tubular-funnelform or almost cylin- 



