\ 



856 CARDUACEAE 



Webby; corolla narrowly tubular-funnelform, about 15 mm. long. Hills: N.M. 

 Colo. Son. — SubmonL Au-S. 



7. C. Howardii (Parry) Greene. Low shrub, 1-3 dm. high; branches whlte- 

 tomentose, ascending; leaves linear-filiform, 3-5 cm. long; involucres 10-12 mm. 

 high; bracts lanceolate-attenuate ^ tomentose as well as arachnoid; flowers scarcely 

 1 cm. long. B. Howardii A. Gray. Dry hills: Neb. — Wyo. — Colo. Plain — 

 Suhfnont. Jl-S. 



8. C. Greenei (A. Gray) Greene. Perennial, with a woody caudex and deep 

 taproot; stems 1-3 dm. high, glabrous and shining, with a white bark; leaves 

 narrowly linear, glabrous, scabrous on the margins, more or less twisted; cj-me 

 flat-topped; heads numerous, 6-8 mm. high; bracts chartaceous, lanceolate. B, 

 Greenei A. Gray. C, scoparius Rydb. Plains: Colo. — N.M. — Utah. Submont. 

 S-O. 



9. C, filifolitis Rydb. Small shrub, about 3 dm. high, very bushy; leaves 

 very narrow, linear-filiform, glabrous except the minutely scabi;ous-ciliolate 

 margins; cyme large, flat-topped; heads very numerous, 5^6 mm. high, turbin- 

 ate; bracts lanceolate-acuminate, the outer with green tips. Plains: Colo.— 

 N.M. Submont. — Mont, Jl-Au. 



10. C. albidus (M. E. Jones) Greene. Shrub, 3-8 dm. high; stem slightly 

 tomentulose and \ascid; leaves filiform, 2-4 cm. long, about 1 mm. wide, very 

 nmnerous, slightly if at all tomentulose; heads fastigiate-corymbose; involucre 

 8-10 mm. high; bracts coriaceous^ lanceolate, the outer subulate-acuminate, the 

 inner merely acute; corollas straw-colored; achenes hirsutulous. B. albida M. E. 

 Jones. Arid regions: Utah — Nev. — se Calif. Son. My-Au. 



11. C. CoUinus Greene. Shrub, 2-4 dm. high, greenish, obscurely cinereous, 

 tomentidose only when young; leaves linear-filiform, soon glabrate and gummy; 

 heads few; bracts carinate, 3 or 4 in each series, the outer lanceolate, acuminate, 

 the inner cuspidate-attenuate. B. collina A. Nels. Hills: Colo.^Wyo. Sub- 

 monL Au. 



12. C. wyomingensls A. Nels. Tufted shrub, 2-4 dm. high, bushy; 

 branches yellowish green, slightly tomentulose when young; leaves narrowly 

 linear, viscidulous; inflorescence thyrsoid, leafy; bracts somewhat indistinctly 5- 

 ranked, lanceolate gradually short-acuminate. Saline soil and dry plains: Colo. 

 — Wyo. Suhmont. Jl-Au. 



13. C. formosus Greene. Low shrub, branched from the base, about 3 dm. 

 high; stem white-tomentose; leaves linear, spreading, white-tomentose; bracts 

 6 or 7 in each vertical rank, glabrous, the outer ovate, the inner longer, oblong- 

 linear, obtuse or acutish. Hills: w Colo, Son, Au. 



14. C. virens Greene. Shrub, 1-2 m. high; leaves ^6 cm. long, linear; 

 heads many in large corymb; involucres 6-7 mm. long; bracts in 4 series; teeth 

 of the corolla obtusish, one-fourth as long as the throat, not spreading. Plains: 



se Colo. Son, S. 



15. C. graveolens (Nutt.) Greene. Shrub, 1-1.5 m. high, green, pannose 

 only when young; leaves linear, 4r-7 cm. long; heads numerous in a compound 

 coryinb; involucres about 8 mm. long: bracts lanceolate, in 4 series; lobes of the 

 corolla lanceolate, more than half as long as the throat, spreading. B, graveolens 

 glabrata A. Gray. C falcatus Greene. C. laetevirens Greene. Canons, bad- 

 lands, and dry hills: Neb. — N.M. — ^Utah — Mont. Plain — SubmonL Au-0. 



16. C. patens Rydb. Shrubb3% half a meter or so high; leaves 6-8 cm. 

 long, about 1 mm. broad; bracts lanceolate, acute, carinate, glabrous; corolla- 

 lobes about 1 mm. long. Dry plains and hills: Colo. Plain — Suhmont, Je-Jl. 



17. C. pinifolius Greene. Shrub, 3-5 dm, high; branches erect, yellowish 

 green and soon glabrous^ slightly resinous; leaves^ 4-5 cm. long, almost filiform; 

 heads in small panicles; mvolucres about 8 mm. high; bracts in 3 series, narrowly 

 lanceolate. Dry hills and plains: Colo. — N.M. — Nev. — Ore. Son. — Suhmont, 



18. C. concolor (A. Nels.) Rydb. Shrub, 3-4 dm. high, woody at the base; 

 branches yellowish green, pannose only when young; leaves linear, somewhat 



