pentstemon SCROPH UL ARIACE.E 611 



ones, the middle one longest: sterile filament short and slender, sparingly 

 bearded. On dry gravelly plains in the Cascade Mountains near the base 

 of Mount Hood Oregon. 



P. Adamsianns. 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. Barrett* 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, 1% 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 tospatulate, 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 1-1% 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 

 bearded. On dry ridges, eastern Washington to California, S. Dakota and 

 Arizona. 



* * * 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-lanceolate 

 to linear, gradually rediu ed upward to small bracts, all but the lowermost 

 sessile and more or less clasping by a broad base, lanceolate ot broader, 



