Pentstemon. SCROPHULARIACEtE. 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 orblue. — 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 Unear, usually quite entire : thyrsus spiciform, interrupted, naked, of 2 

 to 6 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 Up conspicuously bearded within. — Lindl. Bot. Reg. t. 1260; Hook. I.e.; Benth. 

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

 'Oregon. The commoner state is 



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

 higher mountains from 10 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. I.e. 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. Watsoni. 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 narrowlj'- funnelform, 6 to 8 lines long, violet-purple or partly white ; 

 lower lip almost glabrous within. — P. Fremonti, var. Parryi, 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. gracilis. 



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. 1 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, raarginless. 



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-f unnelform or almost cylin- 



