272 ALSINACEAE 



Sepals light green; plant not depressed, 3-12-flowered. 



7. C tariabile. 



Petals scarcely if at all exceeding the sepals; branches erect or ascending. 



Plant low and cespitose; leaves rather thick, all subsessile. 



8. C. Buffumae. 



Plant taller and simple; leaves thin, the lower spatula te and with winged 

 petioles. 9. C\ vulgatum. 



Leaves, at least the lower ones, linear or linear-lanceolate, acute. 



Leaves of the inflorescence short, broadly ovate, the rest linear. 



10. C. oreophilum. 



Leaves all linear or lanceolate, or rarely linear-oblong. 



Inflorescence racemose-cymose, with almost erect branches, as well as the 



calyx copiously viscid. 11. C. elongatum. 



Inflorescence cymose, with ascending or spreading branches. 



Lower leaves Unear-oblong, 5-8 mm. wide; often obtuse. 



12. C Lcibergii. 



Leaves linear or linear-lanceolate, usually less than 5 mm. wide, all acute 



or acuminate. 



Petals 12-14 mm. long, more than twice as long as the sepals. 



13. C. graminifolium. 



Petals 10 mm. long or less, rarely twice as long as the sepals. 

 Stem villous with reflexed hairs. 



Leaves thin and flaccid, those of the sterile shoots and fascicles 



much narrower than those of the main stem. 



14. C angustatum. 



Leaves firm, with a thick midrib, all alike or those of the sterile 

 shoots broader. 15. C. campestre. 



Stem finely glandular-puberulent. 



Leaves thin and soft, all linear or narrowly linear-lanceolate; 



midrib not prominent. 16. C. scopulorum. 



Leaves thick and firm; midrib prominent. 



Stem 1 dm. high or more; plant green; leaves not coriaceous, 



acute. 17. C strictum. 



Stem depressed, less than 1 dm. high; plant yellowish green; 



leaves coriaceous, the lower often obtuse. 



18. C. thermale. 



m 



1. C. brachypodum (Engelm.) B. L. Robins. Annual; stem often branched 

 at the base, finely villous-viscid, 1-3 dm. high; leaves oblanceolate or oblong, 

 obtuse, 1-3 cm. long, viscid- villous; flowers in rather open cymes. Dry sandy 

 soil: S.D. — Mo. — Alta. — Tex. — Ariz. — Ore.; Mex. Plain — Submont. Ap-Jl- 



2. C. nutans Raf. Annual; stem often branched at the base, 2-5 dm. 

 high, viscid-villous; leaves oblong or oblong-lanceolate, usually acute, or the 

 lower oblanceolate, 2-7 cm. long; flowers in open cymes; sepals about 4 mm. 

 long, lanceolate; petals slightly longer. C. longipedunculaium Muhl. C 

 Bakeri Greene. Wet places: N.S.—N.C— Ariz.— Ore.— B.C. Plain— Mont. 

 My-Au. 



3. C. pulchellum Rydb. Low decumbent; stems 5-10 cm. long, finely 

 viscid-pubescent; leaves about 1 cm. long and 4 mm. wide, viscid-pubescent on 

 both sides; peduncles 1-1.5 cm. long; petals 10-12 mm. long. Alpine peaks: 

 Colo. Alp, JL 



4. C- alpinum L. Cespitose perennial; stems ascending or decumbent at 

 the base, 1-2 dm. high; leaves 5-20 mm. long, obtuse; cymes usually 1-3-fiowered; 

 pedicels long, erect; calyx 7-8 mm. long, villous; petals about 1 cm. long. Arctic- 

 alpine situations: Greenl. — Que. — Alta.— Alaska; Eurasia. Alp. — Subalp. Je- 

 Au. 



6. C. Earlei Rydb. Perennial with a rootstock; stems weak, ascending, 



2-3 dm. high, viscid-puberulent, branched; leaves obtuse, 1.5-3 cm. long, 3-8 



mm. wide; inflorescence open; bracts ovate or ovate-lanceolate, not scarious; 



pedicels 2-2.5 cm. long; sepals lanceolate, acute, about 5 mm. long; petals not 



deeply cleft. Wet places among rocks in the mountains: Colo. Mont. — Sub- 

 alp. 



6. C, Beeringianum Cham. & Schlecht. Depressed cespitose perennial; 

 stems decumbent or ascending, 5-15 cm. high, more or less viscid-puberulent; 

 leaves 5-15 mm. long, more or less viscid-puberulent; cymes 1-3-flowered; 

 sepals 4-5 mm. long, ovate, thick, acute; petals 6-8 mm. long. Mountain sum- 

 mits, among rocks: Alta.— N.M. — Ariz. — Alaska; Gaspe, Que. Mont,— Alp- 

 Jl-Au. 



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