' PENTSTEMON SCROPH ULARIACEZ 511 
ones, the middle one ese atl sterile filament short and slender, sparingly 
bearded. On dry gravelly plains in the Cascade Mountains near the base 
of Mount Hood Oregon. 
P. Adamsianus. Glabrous except the inflorescence: stems shrubby 
and much branched at base, 4-10 inches high, the numerous short branch- 
es densely leafy: leaves thick, dark green, very smooth and shining, oblong 
or lanceolate to obovate, 6-18 lines long, entire or sparsely and sharply 
serrate above the middle, attenuate below to a short and broad petiole, or 
those of the flowering stems sessile: inflorescence racemose, glandular with 
small stipitate glands: peduncles mostly 1-flowered, 2-6 lines long: sepals 
broadly ovate, acuminate, about 2 lines long: corolla less than an inch 
long, dark purple, tubular-funnelform, with broad tube longer than the 
calyx, ample throat nearly as broad as long, and strongly bilabiate limb, 
the lower lip woolly at base: sterile filament shorter than the others, 
bearded ou the upper side nearly its whole length. On dry ridges of Mount 
Adams Washington. 
P. Barrettz Gray Syn. Fl. Supp. 440. Glabrous throughout and 
very glaucous: stems stout and shrubby, about a foot high densely branch - 
ed below: leaves ovate to oblong or lanceolate, 1-3 inches long very thick 
and leathery flowering branches or peduncles short, leafy up to the inflor- 
escence : peduncles short,often 2-flowered: sepals oblong, more or less abrup- 
tly acuminate, 2 lines long,scarious-coriaceous: corolla lilac- purple, 14¢ inc- 
hes long, tubular-funnelform, with broad tube longer than the calyx, com- 
paratively narrow throat and strongly bilabiate limb, woolly on the lower 
side within : sterile filament as long as the others, not bearded. On a bare 
rocky ridge above Hood River Oregon. 
* * Herbs with simple stems and closely sessile mostly very glab- 
rous entire cauline leaves: inflorescence never glandular-pubescent or 
viscid : flowers showy : corolla blue or violet, ventricose-ampliate above : 
the lobes of the moderately or slightly bilabiate roundish and equally 
spreading: anthers with the diverging or divaricate and distinct cells 
dehiscent from the base nearly or quite to but not confluently through 
the apex, not peltately explanate after dehiscence, either glabrous, 
pilose or long-pilose. 
P. glaber Pursh Fl. 728, Glabrous and glaucous or glaucescent: 
stem stout, 1-2 feet high: leaves obovate to spatulate, narrowed below into 
petioles, including the petiole 2-4 inches long; upper ones lanceolate to 
oblong or linear: thyrsus narrow, more or less secund, densely many-flow- 
ered; peduncles and pedicels short, commonly very short: sepals from 
orbicular-ovate and merely acute to ovate-lanceolate or strongly acuminate 
from a broad base, commonly with erose edges; corolla 1-144 inches long, 
bright blue to violet-purple, rather abruptly expanded above the calyx: 
anthers from glabrous to sparsely hirsute, the cells‘dehiscent to or very 
near the apex: sterile filament shorter than the others and more or less 
Rika On dry ridges, eastern Washington to California, 8. Dakota and 
rizona. 
* * * Herbs, sometimes suffrutescent at base, with simple stems 
and mostly sessile cauline leaves: anthers glabrous, dehiscent from 
base to apex and through the junction of the 2 cells, open after dehis- 
cence commonly completely 1-celled. 
P. Dayanus. Glabrous below, pubescent above: stems rather slender, 
6-18 inches high: lower leaves obovate to lanceolate or linear, laciniately 
toothed or entire, narrowed below to slender petioles as long or longer than 
the blades, including the petioles 2-4 inches long; cauline linear-lanceoiate 
to linear, gradually reduced upward to small bracts, all but the lowermost 
sessile and more or less clasping by a broad base, lanceolate o: broader, 
