270 SCROPHULAKIACEiE. Pentstemon. 



Am. Acad. vi. 66; Watson, Bot. King, 219. — Rocky Mountains, Wyoming, W. Colorado, 

 and Utah, Nuttatt, Hall & Harbour, Parry, Watson. 



Var. sufflruticosus. A span or more high from a stouter woody base : leaves from 

 spatulate to obovate and more petioled, thicker, glabrate : sepals less acuminate : corolla 

 and stamens not seen : probably a distinct species. — Utah near Beaver, Palmer, in fruit. 



++ ++ Leaves from narrowly linear-lanceolate with tapering base or linear-spatulate to filiform, 

 entire : stems or branches racemosely several-many-flowered. 

 = Stem herbaceous to the base, very simple, a foot or two high : corolla broad : sterile filament 

 glabrous : peduncles mostly opposite. 

 P. virgatus, Gray. Minutely glandular-pruinose or glabrous : stem strict and elongated ; 

 thyrsus virgate : leaves all linear-lanceolate (1^ to 4 inches long): peduncles short, 1-3- 

 flowered : sepals ovate : corolla lilac with purple veins, three-fourths inch long, abruptly 

 dilated into a broadly canipanulate funnelform throat (as wide as long), distinctly bilabi- 

 ate ; the broad lips widely spreading : stamens nearly equalling the lips. — Bot. Mex. 

 Bound. 112, •& Proc. Am. Acad. vi. 66. — New Mexico and Arizona, Fendler, Wright, &c. 

 Inflorescence and corolla in the manner of P. secundijlorus. 



= = Stems or tufted branches mostlv simple from a woody base (or herbaceous in the last 

 species), low : sterile filament longitudinally bearded : short peduncles commonly alternate. 



"T*. linarioides, Gray, 1. c. Cinereous, minutely pruinose-puberulent: stems much 

 crowded on the woody base, filiform, rigid, very leafy, 6 to 18 inches high : leaves 6 to 12 

 lines long, from oblanceolate-linear (at most a line wide) to nearly filiform, mucronulate; 

 the floral short and subulate ; thyrsus racemiform or sometimes paniculate ; only the lower 

 peduncles 2-4-flowered : pedicel shorter than the ovate or oblong acuminate sepals : corolla 

 lilac or purple, half inch or more long, with dilated-funnelform throat, less bilabiate than 

 in the preceding ; lower lip conspicuously bearded at base. — Arid grounds. New Mexico 

 and Arizona, Wriyhl, Thurber, Purry, &c. 



Var. Slleri. A dwarf and suffruticulose form, with smaller and fewer flowers, mostly 

 1-flowered peduncles subtended by proportionally longer floral leaves, and the lower lip 

 less bearded. — P. caispitosus, var.. Parry in Am. Naturalist, ix. 346, a much reduced form. 

 — S. Utah, Slier, Parry. 

 P. Gairdneri, Hook. Cinereous-puberulent ; stems a span high, rigid : leaves linear or 

 the lower more or less spatulate, obtuse, half to full inch long : thyrsus short and simple : 

 peduncles usually one-flowered : sepals oblong-ovate, glandular-viscid : corolla half inch 

 long, narrowly funnelform, obscurely bilabiate, purple. — Fl. ii. 99; Gray, I.e. — Dry inte- 

 rior of Washington Terr., Oregon, and W. Nevada. 



P. laricifolius, Hook. & Arn. Glabrous : lignescent caudex not rising above the 

 ^ soil: leaves very slender, when dry filiform (the larger a fourth of a line wide, and with 

 margins revolute, an inch or less long), much crowded in subradical tufts and scattered on 

 the (2 or 5 inch long) filiform flowering stems: flowers few, loosely raceiuose, slender-1 

 pedicelled : sepals ovate-lanceolate : corolla tubular-funnelform, half inch long ; the small 

 limb obscurely bilabiate. — Bot. Beech. 376 ; Gray, I.e. — Interior of Oregon and Wyoming. 



===== Stems paniculately branching and slender, woody toward the base ; corolla between 

 funnelform and salverform : sterile filament glabrous : peduncles slender, opposite, all the upper 

 one-flowered. 



"P. amblguus, Torr. Glabrous, a foot or two high, diffuse and often much branched ; 

 leaves filiform, or the lowest linear and the floral slender-subulate : inflorescence loosely 

 paniculate : sepals ovate, acuminate : corolla rose-color and flesh-color turning to white ; 

 the rotately expanded limb oblique but obscurely bilabiate ; lobes orbicular-oval ; throat or 

 its lower side somewhat hairy: sterile filament sometimes imperfectly antheriferous. — 

 Ann. Lye. N. Y. ii. 228, & Marcy Rep. t. 16; Gray, Proc. Am. Acad. vi. 64. — Plains of E. 

 Colorado and New Mexico to S. Utah and Arizona. (Adjacent Mex.) Var. /o^iosus, Benth. 

 1. c, is an undeveloped state. Corolla in the typical form with a narrow and s'omewhat 

 curved tube and throat, of half inch in length : but it passes into 



Var. Thurberi, Gray, 1. c. (P. Thurberi, Torr. in Pacif. R. Kep. vii. 15), with 

 shorter tube and more dilated throat. The two extremes of this have, in the larger forms, 

 limb of corolla half inch in diameter with tube and throat together only 3 lines long (Ari- 

 zona, Palmer, &c.) ; in the smallest, corolla-limb only half the size, with tube and throat 

 2 or 3 lines long (Arizona and adjacent Mex., WisUzenus, Rolhrock). New Mexico, Arizona, 

 and S. Utah. 



