Pentstemnn. SCROPHULARIACEiE. 263 



Var. alpinus, Gray. A span high : cauline leaves from narrowly to broadly lan- 

 ceolate : thyrsus abbreviated and few-flowered. — P.aljiimis, Torr. in Ann. Lye. N. Y. i. 35. 

 — Alpine region of the Rocky Mountains, from the Yellowstone to Pike's Peak. 



Var. Utahensis, W^atson. Stems a foot or two high, strict and slender (some- 

 times pruinose-puberulent) : cauline leaves lanceolate, or even linear lanceolate, the lower 

 tapering to the base : thyrsus virgate : sepals either narrower or much acuminate : sterile 

 filament and usually the anthers hirsute. — Bot. King, 217. — Utah to Arizona and the 

 borders of California, passing into the P. speciosus, Dougl., and the lower forms into the 

 preceding variety. 



Var. cyananthus, Gray. Usually tall and less glaucescent : leaves all broad ; the 

 cauline ovate or subcordate and ovate-lanceolate : thyrsus dense : sepals much acuminate 

 or narrow : corolla bright blue : anthers and sterile filament from hirsute to nearly gla- 

 brous. — Proc. Am. Acad. vi. 60. P. cyananthus, Hook. Bot. Mag. t. 4464 ; Watson, Bot. 

 King, 1. c. — Rocky Mountains, Wyoming and Colorado to the Wahsatch in Utah. Seems 

 very distinct, but passes into P. glaher. 

 P. W^ardi, Gray. Low, a span or more high, minutely and densely cinereous-pubescent : 

 leaves tjiick, oblong or the upper oblong-lanceolate : corolla externally pale and sparsely 

 puberulent : anthers cartilaginous ; the cells dehiscent from the acutish base upward for 

 little more than three-fourths of their length, glabrous : sterile filament also glabrous : 

 otherwise like the preceding, of which it may be only a variety. — Proc. Am. Acad. xii. 

 82. — Gienwood, Utah, L. F. Ward. 



****** (Genuini.) Anthers dehiscent from base to apex and through the junction of 

 the two cells, glabrous' (or merely hirtello-ciliate at lines of dehiscence), open after dehiscence, 

 usually explanate in age, in tlie greater number continently 1-celled : herbs, or rarely sutfrutes- 

 cent at base; the species of the first following subdivision approaching the preceding. 



•f— Glabrous throughout (or rarelv minutely pruinose-puberulent or glandular) even to pedicels 

 and cal^'.x: leaves all entire, from linear to ovate, glaucous or pale: stems simple and erect: 

 thyrsus virgate or contracted, with short or hardly any peduncles : five lobes of the corolla plane : 

 anthers of cartilaginous or coriaceous texture. 



++ Corolla less than an inch long, lilac or mauve-purple, or verging to violet, abruptly campanu- 

 late-iutlated, and the broad rather strongly bilabiate limb widely spreading or open. 



P. secundiflorus, Benth. A foot or two high, including the elongated and racemi- 

 form strict many flowered thyrsus : cauline leaves narrowly lanceolate (2 or 3 inches long 

 and lines wide) ; radical spatulate : peduncles 1-3-flowered: sepals ovate or oblong, acute 

 or obtuse, with somewhat scarious but entire margins : corolla with narrow proper tube 

 of nearly twice the length of the calyx, abruptly dilated into the broadly campanulate 

 throat of about one-third inch in height and width ; this nearly equalled by the widely 

 spreading lips ; the lobes round-oval : sterile filament glabrous or minutely bearded at the 

 dilated tip. — Prodr. x. 324. — Mountains of Colorado, common at 8 or 9,000 feet. A well- 

 marked and beautiful species. 



P. Hallii, Gray. Allied to the foregoing, only a span or so high : leaves thickish, linear 

 and linear-spatulate, or the lowest rather broader, obtuse : thyrsus short and more spici- 

 form, 5-15-flowered, obscurely viscid : sepals broadly ovate and with widely scarious erose 

 margins : corolla 7 to 10 lines long, broadly campanulate-inflated from a thickish and in- 

 conspicuous proper tube which is shorter than the calyx ; bilabiate limb rather short : 

 sterile filament short-bearded from tlic apex downward. — Proc. Aqi. Acad. vi. 71. — Colo- 

 rado Rocky Mountains, at 10-12,000 feet (common on Gray's Peak), ifo// & Harbour, Pan-y, 

 Greene, &c. 



Var. Arizonicus. An ambiguous form, almost a foot high, with flowers apparently 

 intermediate between those of P. Hallii and P. secundiflorus, and sterile filament of the lat- 

 ter ; but corolla lips shorter than the less abruptly expanded portion. — Mount Graham, 

 Arizona, at 9,250 feet, Rothrock. 



++ ++ Corolla two-thirds or three-fourths inch long, from blue to lilac : the tube gradually and mod- 

 erately dilated into the funnelform throat; lobes of the obscurely bilabiate 5-parted limb 

 short and widely spreading. (See also P. conj'ertus, Watsoni, &c., which, being glabrous and 

 entire-leaved, might be referred here.) 



P. acuminatus, Dougl. Glaucous, 6 to 20 inches high, generally stout and rigid, leafy : 

 leaves coriaceous, somewhat cartilaginous-margined ; radical and lowest cauline obovate 

 or oblong ; upper cauline from lanceolate to broadly ovate, or the upper cordate-clasping, 

 these mostly acute or acuminate : thyrsus strict, interrupted, leafy below, naked above ; 



