704 HYDROPHYLLACEAE 



2. P. Burkei Rydb. Stems 2-3 dm. high, canescent; basal leaves 3-10 cm. 

 long, petioled, lanceolate, entire, strongly veined, densely white-canescent on 

 both sides; calyx canescent and hispid-ciliate; lobes obtuse, two-thirds as long 

 as the corolla; corolla pubescent; stamens about twice as long as the corolla, 

 villous-bearded. Dry hills: Ida. Wash. Submont. 



3. P. nervosa Rydb. Stems decumbent at the base, 1-3 dm. high, more or 

 less hirsute; lower leaves 2-7 cm. long, simple or with a pair of smaller lobes on 

 the petioles, lanceolate, 2-5 cm. long, acute, hirsute on both sides; inflorescence 

 soon open; calyx more or less tinged with purple, about as long as the corolla; 

 corolla white or nearly so, pubescent, about 5 mm. long; filaments about twice 

 as long as the corolla, slightly bearded. P. alpina Rydb. (Fl. Colo.) Mountains: 

 Colo. Subalp. Alp. Je-Au. 



4. P. biennis A. Nels. Stem strict, usually purplish, 3-4 dm. long, spar- 

 ingly and closely canescent and slightly hirsute; basal leaves simple or often 

 with a pair of divergent lobes on the petioles, appressed-hirsute and with finer 

 pubescence intermixed, oblong, acute, 5-10 cm. long; calyx-lobes oblong-linear 

 or linear, about three-fourths as long as the corolla, obtuse; corolla 5 mm. long; 

 filaments distinctly villous-bearded. Mountain valleys: Mont. Colo. Ida. 

 Submont. My-Jl. 



5. P. heterophylla Pursh. Stem 3-6 dm. high, strict, hirsute and tomen- 

 tulose; leaves entire, or with one or two pairs of lanceolate segments or lobes below; 

 blade or terminal segment lanceolate, 5-10 cm. long; calyx hirsute, ciliate and 

 tomentose, three-fourths as long as the corolla or nearly equalling it; lobes nar- 

 rowly linear, usually acute; corolla 5-6 mm. long; filaments villous-bearded. P. 

 hastata Dougl. Hills and mountains : Alta. Colo. Utah Wash. B.C. Sub- 

 mont. My-Jl. 



6. P. alpina Rydb. Stem about 2 dm. high, sparingly grayish strigose and 

 hirsute; basal leaves short-petioled, about 5 cm. long, oblong-lanceolate or ob- 

 lanceolate, entire, grayish strigose; calyx hispid; lobes linear, obtuse or acutish; 

 corolla 5-6 mm. long, lilac; filaments bearded. Mountains: Mont. Wvo. 

 Utah B.C. Mont. Je-Jl. 



7. P. leptosepala Rydb. Stems ascending, hirsute, 1-3 dm. high; leaves 

 usually simple, hirsute on both sides, 5-10 cm. long, oblanceolate or elliptic; 

 calyx hirsute; lobes narrowly linear, hirsute, nearly as long as the corolla, acute; 

 corolla glabrous or nearly so, 5 mm. long; filaments about twice as long, sparingly 

 villous-bearded. Mountains: B.C. Mont. Submont. Je-Au. 



8. P. humilis T. & G. Diffusely branched annual; stem 1-2 dm. high, 

 pilose or somewhat hirsute; leaves elliptic, spatulate, or oblanceolate, more or 

 less hirsute, 2-5 cm. long, usually simple; calyx-lobes narrowly linear, hirsute, 

 nearly two-thirds as long as the blue or purple corolla, which is 5-6 mm. long; 

 filaments slightly exserted, glabrous or nearly so. Dry gravelly soil: Calif. 

 Utah. Son. My-Jl. 



9. P. Palmeri Torr.. Stem simple, 2-4 dm. high, usually decidedly viscid- 

 glandular; leaves short-petioled or subsessile, numerous and crowded, 2-8 cm. 

 long, coarsely dentate, or more or less lobed, lanceolate or oblong; inflorescence 

 dense and spike-like; calyx-lobes narrowly linear-oblanceolate, hirsute-glandular; 

 corolla 6-7 mm. long; filaments glabrous. P. foetida Goodding. Arid soil: s 

 Utah. Son. 



10. P. orbicularis Rydb. Stem 1-2 dm. high, glandular-villous, often 

 tinged with red, branched; leaf-blades petioled, suborbicular in outline, crenately 

 lobed, 1.5-2.5 cm. long, hirsute as well as glandular; calyx-lobes oblong or ob- 

 lanceolate, obtuse, 3 mm. long; corolla purplish, 6 mm. long; lobes crenulate; 

 filaments about twice as long as the corolla. Arid places: Utah. Son. 



11. P. integrifolia Torr. Stem 2-6 dm. high, branched, glandular-puberu- 

 lent, only slightly hirsute; leaves short-petioled or the upper sessile; blades 2-10 

 cm. long, round-lobed and crenate; inflorescence open, 5-10 cm. long; calyx-lobes 

 elliptic or oblong; corolla bluish or whitish, 5-6 mm. long; filaments glabrous. 

 In gypsum soil: Kans. w Tex. Ariz. Utah; n Mex. Son. Ap-Jl. 



