CHICKWEED FAMILY 273 



7. C. variabile Goodding. Cespitose perennial; stems many, erect, 15-25 

 cm. high, viscid-pubescent; leaves from spatulate to oblong or lanceolate, 1-3 

 cm. long; sepals oblong or lance-oblong, acute, 6-7 mm. long; petals 7-8 mm. 

 long. C. pilosum Greene, not Ledeb. Moist places among rocks: Colo. 

 Utah. Mont. Subalp. Ap-Au. 



8. C. Buffumae A. Nels. Cespitose perennial; stems numerous, 7-15 cm. 

 long, glandular-puberulent, leafy; leaves oblong or elliptic, 5-12 mm. long; cymes 

 dense, 3-10-flowered; sepals green, barely scarious-margined at the tips, oblong, 

 obtusish, 4-5 mm. long; petals 6-7 mm. long. Mountains: Wyo. ne Utah. 

 Mont. 



9. C. vulgatum L. Perennial, cespitose at the base; stems 1-4 dm. high, 

 viscid-pubescent; leaves oblong or elliptic, obtuse, 1-3 cm. long, villous; cymes 

 elongate; bracts foliaceous; at least the lower pedicels exceeding the sepals in 

 fruit; sepals about 5 mm. long, obtuse, scarious-margined; petals about as long. 

 Roadsides and fields: Lab. Fla. Ida. Wash. Alaska. Plain. My-Jl. 



10. C. oreophilum Greene. Cespitose perennial; stems decumbent at the 

 base, 1-2 dm. high, glandular-pubescent; leaves 1-3 cm. long, viscid-pubescent; 

 cymes many-flowered; calyx about 5 mm. long, glandular; sepals ovate-lanceo- 

 late, acute, more or less scarious-margined; petals 8-9 mm. long. Wet places in 

 the mountains: Colo. nw N.M. Submont. Subalp. My-Jl. 



11. C. elongatum Pursh. Cespitose perennial; stems much branched, de- 

 cumbent at the base, 2-3 dm. high, short-pubescent with white reflex ed hairs 

 below, very glandular above; leaves narrowly linear, rather stiff, with prominent 

 midnerve, 1.5-3 cm. long; sepals 4-5 mm. long, ovate, acute, scarious-margined; 

 petals about 7 mm. long. Hills: Mont. n Wyo. Wash. Plain 'Submont. 

 Jl-Au. 



12. C. Leibergii Rydb. Perennial, with a slender branched rootstock; 

 stems simple, 4-5 dm. high, sparingly villous and viscid-puberulent; leaves 2.5-3 

 cm. long, 6-7 mm. wide, 1-nerved, thin, inflorescence viscid-puberulent; sepals 

 about 5 mm. long, lanceolate, viscid-pubescent; petals scarcely twice as long as 

 the sepals. Open forests: Ida. Mont. Submont. Je. 



13. C. graminifolium Rydb. Perennial, with a slender branched root- 

 stock; stems 3-5 dm. high, densely short-yillous and somewhat viscid, erect; 

 leaves 2-3 cm. long, 1-nerved, short viscid-villous, mostly spreading; sepals nar- 

 rowly lanceolate, viscid-pubescent, only slightly scarious-margined, acute, 5-6 

 mm long. Bottom lands: Wash. Mont. Wyo. Ore. Submont. Ap-Je. 



14. C. angustatum Greene. Cespitose perennial; stems 2-3 dm. high, 

 erect or ascending; primary leaves of the stem linear-lanceolate or linear, 2-4 

 cm. long, villous; inflorescence many-flowered, somewhat glandular; sepals 

 about 4 mm. long, lanceolate, acute, light green, only slightly viscid. Hillsides: 

 Man. S.D. Wyo. Mont. Plain Submont. Je-Jl. 



15. C. campestre Greene. Cespitose perennial; stems decumbent at the 

 base or ascending, 1-2 dm. high; leaves 1-2 cm. long, linear-lanceolate, ascending, 

 or the lower ones oblanceolate; sepals lanceolate, about 5 mm. long; petals about 

 twice as long. Plains and hills : Man. S.D. Colo. Yukon. Plain Submont. 



16. C. scopulorum Greene. Cespitose perennial; stems 1-2.5 dm. high; 

 leaves 1.5-2 cm. long, more or less glanclular-puberulent; cymes several-flowered; 

 calyx 4-5 mm. long, glandular-puberulent, acute; corolla about twice as long. 

 (?) C. effusum Greene. Mountains: Alta. N.M. Submont. Mont. My-Jl. 



17. C. strictum L. Cespitose perennial; stems decumbent at the base, 

 1-2 dm. high; leaves 1-2 cm. long, linear-oblong, acute, ascending, glandular- 

 puberulent; cymes 5-15-flowered, rather short; sepals about 5 mm. long, scarious- 

 margined, acute, viscid-puberulent; petals about twice as long. C. occidentals 

 Greene. Mountains and dry hills: Mont. S.D. Colo. Utah Wash. B.C.; 

 Eurasia. Plain Subalp. My-Au. 



18. C. thermale Rydb. Densely cespitose perennial; stem decumbent, 

 5-12 cm. long, viscid-puberulent; leaves less than 1 cm. long, lanceolate and 



13 



