686 POLEMONIACEAE 



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somewhat divergent, with prominent midrib; flowers sessile or nearly so; calyx 

 about 5 mm, long; teeth lanceolate, bristle-pointed; corolla white; tube exceed- 

 ing the calyx; lobes oblong. Dry hills: Black Hills, S.D. SubmonL Je. 



10. P. diffusa Benth. Loosely cespitose-spreading perennial; branches 2-3 

 cm. long, glabrous; leaves 6-12 mm. long, oblong-linear, 1-2 mm. ^ide, spread- 

 ing, apiculatej with strong midrib; flowers sessile or subsessile; calyx sparsely 

 lanate-cihate, 5-7 mm. long; teeth lance-subulate, somewhat spreading; corolla 

 white, about 15 mm. long; lobes entire, obovate. Hills and mountains: B.C. — 

 Wyo. — Calif. Submont, Je-Au. 



11. P. glabrata (E. Nels.) A. Brand. Branches numerous, 5 cm. long or less; 

 leaves glabrous or slightly arachnoid at the nodes, densely imbricate, appressed, 

 linear, flat, 5-10 mm. long; flowers sessile, solitary; calyx 4-5 mm. long, glabrous 

 or slightly arachnoid between the ribs; teeth subulate; corolla S-10 mm. long; 

 lobes broadly ovate. Open plains and hills: Wyo. Submont. My, 



12. P. Douglasii Hook. Stem much branched from a woody root; leaves 

 acerose, pungent, 5-15 mm. long, ciliate and usually conspicuously glandular, 

 rarely glabrate; flowers sessile; calyx ciliate and glandular; teeth subulate; corolla 

 18-20 mm. long, white; tube exserted; lobes obovate or roimdfed, 6-7 mm. long. 

 Hills and mountains: Wash. — Mont. — Nev.—n Calif. Suhmoni.—MonL My-Jh 



13. P. condensata (A. Gray) E. Nels. Leaves imbricate, rigid, linear, 

 apiculate, 5-6 mm. long, strongly ascending, straight, with a strong midrib, 

 hispid-ciliate on the margins; calyx glandular and ciliate; lobes similar to the 

 leaves; corolla white, 8-10 mm. long; tube much exceeding the calyx; lobes 

 rounded, about 4 mm. long. P. caespitosa condensata A. Gray. High mountam 

 ridges: Colo. Subalj). — Alp. Je-Jl. 



14. P. caespitosa Nutt. Leaves linear or oblong-linear, apiculate, 8-14 

 mm. long, 1-2 mm. wide, usually flat, hispid-ciliate on the margins ; flowers 

 sessile or subsessile, solitarj^ at the ends of the branches; calyx hispid-ciliate and 

 glandular; lobes as long as the tube, lanceolate, pungent; corolla white or light 

 blue, fully twice as long as the calyx; lobes obovate, 5-7 mm. long. Mountams: 

 Mont. — N.M. — Utah^Ore. — B.C. Submont. — Subalp. Je-Au. 



15. P. rigida Benth. Leaves subulate-acerose, at last recurved^spreading, 

 5-10 mm, long, hispid-ciUate and somewhat glandular; flowers solitary, sub- 

 sessile; calyx hispid-ciliate, more or less glandular; lobes acerose; corolla 10-12 

 mm. long; tube much longer than the calyx; lobes obovate, about 5 mm. long. 

 Dry hills and mountains: Mont. — Utah— Ore. — Wash. SubmonL My-Jl- 



16. P. Kelseyi Britton. Branches 1-2 dm. long; leaves flat, lanceolate or 

 linear, 1-1.5 cm. long, narrowly white-margined, usually ciliate, sometimes 

 glandular^ sometimes glabrate; flowers solitary, short-pedicelled ; calyx nearly 1 

 cm. long, ciliate and often glandular; teeth subulate; corolla blue, lilac, ^J*P^ '. 

 rarely white, fully 2 cm. long; lobes broadly obovate, 7-8 mm. long. Valleys: 

 N.D. — Colo. — Mont. Plain — Subalp, 



17. P, alyssifolia Greene. Branches short, with w^hite shreddy bark; 

 leaves oblong or hnear, or the earlier ones ovate, 5-15 mm. long, 2^4 ^^- w^^^? 

 usually ciliate on the margins and sometimes a Httle glandular, cuspidate; flowers 

 sessile or nearly so; calyx ciliate, strongly ribbed^ often considerably glandinar, 

 calyx 7-8 mm. long; teeth oblong, acerose-cuspidate, rather shorter than the 

 tube; corolla bluish, rarely white, 15-18 mm. long; lobes obovate, 7-8 mm. ^ng. 

 P. colUna Rydb. P. variabilis A. Brand. Mountains and dry benches: bask. 



S.D. — Colo.— Utah — Mont. Submont.— Mont. My-Au. 



18. P. albomarginata M. E. Jones. Floral stems 2-7 cm, high, 1--3- 

 flowered; leaves 4~-6 mm. long, 2-3 mm. wide, spreading, ovate or lanceolate, 

 hispid-ciliate at the base, and pubescent beneath; pedicels 2-8 mm. long; calyx 

 7-8 mm. long; teeth 2-3 mm. long, subulate, acerose, scarcclv spreading; corolla 

 purplish or lilac, 12-15 mm. long; lobes about 4 mm. long, obovate. Mountam 

 sides and hills: Mont. Submont, Aly-Je. 



19. P. diapeusioides Rydb. Branches about 2 cm. high; leaves crowded, 

 numerous, 4-5 mm. long, ovate, sharply acerose-cuspidate, thick, with a strong 



