408 POLEMONIACEAE 



the tube mainly scarious ; corolla-tube about equaling the calyx in anthesis, throat dilated, limb 

 1.5-3 mm. broad, oblong-oblanceolate, acutish, pale yellow, often purplish in age. 



Dry sandy soil, Upper Sonoran Zone to Canadian Zone; western Harney County, southern Oregon, south- 

 east of the Cascades and Sierra Nevada to the White Mountains, Mono County, California; east to Idaho, 

 Nevada, Utah, Wyoming, and Colorado. Type locality: Swan Lake, Yellowstone Park, Wyoming. April-July. 



4. PHLOX L. Sp. PI. 151. 1753. 



Perennial or rarely annual, erect, diffuse or cespitose herbs with opposite leaves or 

 sometimes the uppermost alternate. Flowers often showy, white, blue, purple or red, in 

 terminal cymes or cymose panicles, or sometimes solitary. Calyx tubular to tubular- 

 campanulate, 5-cleft and 5-ribbed, the lobes acute or acuminate, usually with scarious 

 margins and sinuses. Corolla salverform with narrow tube and 5-lobed rim ; lobes obovate 

 to orbicular or obcordate, spreading. Stamens included, irregularly inserted on the 

 corolla-tube. Ovary ovoid to oblong, 3-celled ; style usually slender ; ovules 1-4 in each 

 cell. Capsule ovoid. 3-valved, distending and rupturing the calyx-tube in age. Seeds 

 usually solitary in the cells of the capsule, ovoid or narrowly winged, not emitting spiral 

 threads when wet. [Name Greek, meaning flame.] 



A genus of about 45 species, native of North America and northern Asia. Type species. Phlox glaberrima L. 



Perennials. 



Plants not cespitose, the stems usually erect, with distinct internodes; leaves not rigid or acerose. 

 Style longer than the calyx. 



Leaves 1-4 cm. broad; stems mostly prostrate, often developing adventitious roots. 



1. P. adsurgens. 



Leaves at most not over 6 mm. broad; stems erect or ascending, not developing adventitious roots. 

 Corolla-tube 1-2.5 cm. long. 



Herbage glabrous throughout or glandular-pubescent only in the inflorescence; corolla-tube 

 ,1-1.5 cm. long. 2. P. longifolia. 



Herbage glandular-pubescent throughout; corolla-tube 1-2.5 cm. long. 



3. P. Stansburyi. 



Corolla-tube 3.5-4 cm. long. 4. P. dolichantha. 



Style 2-4 mm. long, shorter than the calyx. 5. P. speciosa. 



Plants low and tufted or cespitose; leaves crowded, very narrow and often rigid and pungent; style shorter 

 than the calyx. 

 Intercostal membrane distinctly carinate; leaves acerose or narrowly subulate. 



Stems glabrous below, glandular-pubescent above ; leaves 1 . 5-3 cm. long. 



6. P. aculeata. 



Stems glabrous below, pubescent above, not glandular; leaves 1-1.5 cm. long, pubescent above, 

 glabrous beneath. 7. P. atistromontana. 



Intercostal membrane flat or inconspicuously carinate. 

 Pubescence glandular. 



Surface of the leaves glabrous. 



Pubescence glandular throughout; leaf-margins inconspicuously ciliate; leaves mainly 

 subulate; internodes about as long as leaves. 8. P. Douglasii. 



Pubescence with both glandular and eglandular hairs; leaf-margins conspicuously ciliate 

 below; internodes evident but shorter than the leaves, these mostly 4-6 mm. long. 



9. P. caespitosa. 



Surface of the leaves glandular-hispid; leaves narrowly oblong, less than 5 mm. long. 



10. P. Covillei. 

 Pubescence not glandular. 



Plants cespitose or loosely pulvinate; pubescence sparser or wanting in the internodes; leaves 

 subulate. 



Plants bright green, usually diffusely branched; leaves and internodes very thinly villous. 



11. P. diffusa. 



Plants pale grayish green; wooly tomentose on the leaf-margins and rather sparsely so on 

 the internodes. 12. P. canesccns. 



Plants pulvinate, densely tomentose throughout. 



Leaves 5-10 mm. long, plane, subulate, spaced, not closely imbricated, the cylindric stem 

 exposed. 13. P. lanata. 



Leaves 3-5 mm. long, concave, oblong-elliptic, imbricated, completely concealing the 

 stem, this forming moss-like 4-angled branches. 14. P. bry aides. 



Annuals. IS. P. gracilis. 



1. Phlox adsurgens Torr. Woodland Phlox. Fig. 3911. 



Phlox adsurgens Torr. ex A. Gray, Proc. Amer. Acad. 8: 256. 1870. 



Perennial with slender roots, stems several, slender, creeping or decumbent, simple or spar- 

 ingly branched, 2-5 dm. long, glabrous below, puberulent to glandular-villous and with short 

 hairs. Leaves lanceolate-ovate to round-ovate or obovate, thin, sessile, or short-petioled, 7-30 

 mm. long, 5-15 mm. wide; inflorescence open, mostly few-flowered; calyx 10-13 mm. long, the 

 lobes subulate with a prominent midrib, equaling or often a little longer than the tube ; mem- 

 branous sinus not carinate; corolla bright pink, tube 12-18 mm. long, lobes obovate, about half 

 as long as the tube, rounded at apex ; style nearly equaling the corolla-tube. 



Open forests, mainly Humid Transition Zone; Linn County, western Oregon, southward to Siskiyou and 

 Mendocino Counties, northwestern California. Type locality: "Caiion Pass, Oregon." June— Aug. 



