APPENDIX. 463 



9. P. EEPTANS, Miohx. Penusylvauia and Kentucky to Georgia ; Arkansas, (Nuttall.) 



* * * Few-flowered, low, diffuse ; leaves linear ; corolla pale-violet, with 2-oleft ouneate lolies, the 

 segments narrowj^ 



10. P. BIFIDA, Beck. Pubescent, witla the loaves sometimes glahrato ; corolla-lubes cleft at least to 

 the middle, the divisions nearly linear. — Illinois and Missouri. 



11. P. Stellaria, Gray. Glabrous, csespitose, somewhat perennial at base ; leaves narrow-linear 

 and rather rigid, the upper slightly ciliate at base ; peduncles elongated, mostly 1-flowered ; corolla pale- 

 blue or nearly white, the lobes bifid with short-oblong segments. — Cliffs of the Kentucky River, only by 

 Dr. Short. 



5 2. Slightly suffrutesoent perennial eastern species, with subulate fascicled evergreen leaves ; ovules 

 1-2 in each cell ; corolla lobes only oboordate. 



12. P. SUBULATA, L. Usually with a long style and solitary ovules. —Southern New York to Michi- 

 gan, and south to Florida and Mississippi. 



§ 3. Species of the Rocky Mts. 'and westward, or arctic, somewhat woody or rarely herbaceous at 

 base, the ovules 1-3 in each cell ; branches 1-few-flowered ; leaves mostly narrow or small, usually 

 more or less cartilaginous-thickened (or rather revolute) on the margin. 



* Matted-csespltose subshrnbby evergreen perennials ; leaves short, sometimes very small, crowded 

 or imbricated and fascicled up to the very flowers, scarious-connate at base, the older ones marces- 

 cent ; flowers solitary, sessile, (in P. Douglasii sometimes short-peduncled ;) ovules solitary. 



(a.) Leaves with webby hairs, at least upon the margin. 

 (1.) In mosslike cushions, the very short broadish or scalelike leaves imbricated, soft, and merely 

 mucronate ; corolla-lobes entire. 



13. P. RlCHARDSONii, Hook. Rather loosely matted ; leaves oblong-lanceolate, 3" long, somewhat 

 sparingly woolly, with thickened margins, soon reflexed, imbricated, loosely spreading when old ; corolla- 

 tube half longer than the calyx, the lobes broadly cuneate-obovate, 3" long. — Arctic Coast. 



14. P. BKYOIDKS, Nutt. More densely matted and very small, with an abundant very soft wool ; 

 branchlets separated ; leaves scalelike, closely imbricate in four rows, ovate- or triangular-lanceolate, 

 IJ" long, very close and appressed even when old, the margins subinflexed ; corolla-tube a little exceed- 

 ing the calyx, the cuneate lobes 11" long.— Rocky Mts. of W. Wyoming, (Nuttall.) 



15. P. MUSCoiDES, Nutt. Resembling the last; branches short and very crowded ; leaves less strictly 

 4-ranked, more sparingly woolly, ovate-lanceolate, 1|" long, slightly mucronate; calyx equaling the co- 

 rolla-tube. — Rocky Mts., only by Wyeth. 



(2.) Leaves more rigid, subulate, somewhat acerose, 3-4" long, less closely imbricated ; flowers 

 white. 



16. P. HooDil, Rich. Rather sparingly woolly, glabrate ; leaves erect ; corolla-tube not exceeding 

 the calyx, the lobes obovate, entire, 2-21" long.- Montana and the Saskatchewan region. 



17. P. CANBSCENS, T. & G. More woolly and leaves spreading ; corolla more or less exceeding the 

 calyx, the lobes 3-4" long, entire or emarginate. See page 259. 



(J.) Leaves more rigid, hirsute- or roughish-ciliate on the margins, at least at base, or sometimes 

 naked. 



18. P. CiESPiTOSA, Nutt. Leaves linear-subulate or oblong-linear, rigid, close, ciliate, otherwise 

 glabrous or sparingly glandular ; corolla-tube a little exceeding the calyx. See page 259. 



19. P. DouGLAsn, Hook. Pubescent or nearly glabrous; leaves r'ather rigid, acerose, more usually 

 spreading and less close, the margins either naked or ciliate at base ; corolla-tube more or less exceeding 

 the calyx. See page 260. 



'' ' Showy, from a many-branched or loosely csespitose woody or sometimes herbaceous base ; leaves 

 usually longer, linear or lanceolate, rarely subovate, loose .ind not fascicled or but slightly so ; 

 flowers solitary or subcymose, rather long peduncled. 



(a.) Style elongated. 

 (1.) Arctic ; leaves and loosely csespitose stems somewhat lax. 



20. P. SiBiRiCA, L. 2-4' high, hairy-pubescent ; leaves narrow-linear, usually a little villous on the 

 margin ; peduncles naked, 1-flowered ; corolla-tube equaling or a little exceeding its obcordate or retuse 

 lobes and the calyx ; ovules in pairs.— Kotzebue Sound and E. Siberia. 



(2.) Of temperate regions ; the leaves and erect or ascending woody-based stems rather rigid ; corolla- 

 tube exceeding the narrow-subulate calyx-lobes. The first two species mostly narrow-leaved and 

 the calyx usually angled. 



