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filament glabrous or sparsely hirsute.—A species of the Rocky Mountain region, but 
represented in the mountains west of the Pecos (fide Havard) by var. CYANANTHUS 
Gray, whose leaves are all broad, thyrsus dense, corolla bright blue, and anthers and 
sterile filament from hirsute to nearly glabrous. 
*** * Anthers dehiscent from base to apex and through the junction of the two cells, gla- 
brous, open after dehiscence, explanate in age, mostly confluently 1-celled. 
+ Glabrous throughout, even to pedicels and calyx : leaves all entire, from linear to ovate: 
thyrsus virgate or contracted, 
++ Corolla 16 to 25 mm. long, tubular or funnelform, 
5. P. acuminatus Dougl. Stem 1.5 to 5 dm. high, stout: leaves thick, the lower 
obovate or oblong, the upper lanceolate to broadly ovate or cordate-clasping, 
acute or acuminate: thyrsus leafy below, very narrow: corolla 16 to 18 mm. long, 
lilac or violet, the tube gradually and moderately dilated into the funnelform 
throat: sterile filament mostly bearded at the dilated tip.—Western borders of 
Texas. 
6. P. Wrightii Hook. Stems rather stout, 3 to 6 dm. high: leaves oblong or the 
lowest obovate, upper partly clasping by a roundish base: thyrsus elongated, 
loosely flowered: corolla about 18 mm. long, bright rose-color, and with ampliate 
throat: sterile filament dilated at tip and retrorsely bearded down one side.—West- 
ern Texas. 
7. P. Havardi Gray. About 6 dm. high: leaves coriaceous, oval or oblong, 
lower long-petioled, upper small and half-clasping, those of the elongated racemi- 
form thyrsus reduced to small or minute bracts: corolla 25 mm. long, violet or blue, 
tubular (throat not over 6 mm. wide and lips only 4 mm, long): sterile filament fili- 
form and naked.—Guadalupe Mountains, southwestern border of Texas (Havard). 
++ ++ Corolla showy, 35 mm. or more long, ventricose-funnelform : sterile filament hooked 
at apex: leaves glaucous, thickish, broad: the upper and floral rounded, all but 
the obovate radical ones clasping and perfoliate : stem 6 to 12 dm, high, 
8. P. grandiflorus Nutt. Leaves all distinct at base: pedicels short: corolla lilac 
or lavender-blue, abruptly ventricose above proper tube, which exceeds calyx: 
sterile filament minutely pubescent at the dilated apex.—A species of the northern 
prairies, reported from Gillespie County (Jermy). 
9, P. Murrayanus Hook. Cauline leaves connate-clasping, and all the upper 
pairs united into an oval or orbicular concave disk: pedicels slender: corolla deep 
scarlet, gradually widening upward: sterile filament wholly glabrous,—Prairies of 
eastern Texas. 
+ + From puberulent to viscid-pubescent, 
++ Leaves ovate to lanceolate-linear : corolla ample, purplish: sterile filament more or lesa 
long-bearded. 
10. P. Cobza Nutt. Soft-puberulent: leaves ovate or oblong, or the lower 
broadly lanceolate and the upper subcordate-clasping, most of them acutely denticu- 
late or serrate: thyrsus lax and short: corolla commonly 5 cm. long, abruptly cam- 
panulate-ventricose above the narrow tube, from dull reddish purple to whitish, 
glabrous within: slender sterile filament sparsely bearded.—Prairies of Texas. 
11. P. Jamesii Benth. Pruinose-puberulent: leaves all narrowly or linear-lanceo- 
late, mostly entire or the margins undulate: thyrsus strict, leafy below: corolla 
about 2.5 em. long, abruptly dilated into a broadly cyathiform-campanulate throat, 
a little hairy within: sterile filament moderately bearded.—Prairies of western 
Texas, 
12, P. albidus Nutt. Viscid-pubescent, 1.5 to 2.5 dm. high: leaves oblong-lanceo- 
late or narrow, entire or sparsely toothed: clusters of the strict thyrsus few-flow- 
ered, approximate: sepals lanceolate, densely pubescent: corolla 18 mm. long, with 
short tube and sterile filament thinly short-bearded, dilated throat,—Extending 
from the northern plains into Texas, 
