Pentstemon. SCROPHULARTACE^. 263 



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

 ceolate : thyrsus abbreviated and few-flowered. P. afj>inus, 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. ylaber. 



P. "Wardi, Gray. Low, a span or more high, minutely and densely cinereous-pubescent : 

 leaves thick, 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. Glenwood, 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 deiiiscence), open after dehiscence, 

 usually explanate in age, in the greater number coiifluently l-celled : herbs, or rarelv suffru tea- 

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



t Glabrous throughout (or rarely minutely pruinose-puberulent or glandular) even to pedicels 

 and calyx: leaves all entire, from linear to ovate, glaucous or pale: stems simple and erect: 

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

 anthers of cartilaginous or coriaceous texture. 



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

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



P. secundifiorus, 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 the apex downward. Proc. Am. Acad. vi. 71. Colo- 

 rado Rocky Mountains, at 10-12,000 feet (common on Gray's Peak), Hall & Harbour, Parry, 

 Greene, &c. 



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

 intermediate between those of P. Hallii. and P. sfcnmUflorus, 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. 



H- -H- 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. aciiminatus, 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; 



