946 CARDUACEAE 



1. C. Nevii A, Gray. Stem 1-2 dm, high, puberulent, branched; leaves 

 pimiate or bipinnate, with linear or oblong lobes, slightly puberulent; involucres 

 about 8 mm. high and 1 cm. broad; corollas yellow, the marginal ones not con- 

 spicuously enlarged; pappus of minute teeth or obsolete. Clayey soil: Ore. — 

 Ida. Son, My-Je. 



2. C. carphoclinia A. Gray. Stem diffusely branched, puberulent, not at 

 all tomentose, 1-3 dm. high; leaves once or twice pinnatifid, with short filiform 

 divisions, puberulent; heads numerous, 30-40-flowered; involucres about 8 mm. 

 high and 10 mm. broad; bracts linear-subulate, puberulent; marginal corollas 

 scarcely enlarged; pappus squamellae 4, ovate-lanceolate, acute or acuminate, 

 those of the marginal flowers much shorter than those of the central ones. Arid 

 regions: N.M. — s Utah — s Calif. Son. 



3. C, stevioides H. & A. Stem 1-3 dm. high, sparingly floccose when 

 yoimg, glabrate in age, and glandular-puberulent in the inflorescence; leaves 

 once or twice pinnately divided into linear divisions, floccose when young; invo- 

 lucres 7-8 mm. high, 10-12 mm. broad; bracts narrowly linear, obtuse; the 

 marginal corollas with enlarged throat and limb, oblique; pappus-squamellae 

 oblong-lanceolate to oblong-ovate, in the marginal flowers broader than in the 

 central ones and imequal. Arid places: Ida. — ^Wyo. — N.M. — Calif. — Nev. Son. 

 — Submont, Ap-Je. 



4. C. Cusickii A. Gray. Stem decumbent, 1 dm. high or less, sparingly 

 floccose, soon glabrate; leaves fleshy, 2-3 cm. long; involucres subtended by a 

 linear leaf, 7-8 mm. high; bracts broadly linear; coroUa white, the marginal not 

 enlarged; pappus-squamellae 10, linear-oblong, nearly equal and equalhng the 

 corolla-tube. Sandy hills: Ore. — Ida. Submont, 



6. C. macrantha D. C. Eat. Stem 1-2 dm. high, tomentose when young, 

 glabrate in age, branched from the base; leaves pinnately or bipinnately divided 

 into oblong or linear divisions, floccose when young, glabrate in age; involucres 

 12-15 mm. high and about as wide; bracts linear, more or less tomentose; corollas 

 externally puberulent, all alike, white or flesh-colored; pappus of 4 hnear-oblong 

 squameUae, 4 mm. long, and sometimes some smaller ones. Hills in desert 

 regions: Ariz. — Utah — Nev. — Calif. Son. My. 



6. C. brachiata Greene. Stem 2-4 dm. high; leaves white-tomentose; 

 involucres about 12 mm. high, 12-15 mm. broad; bracts linear, acute or obtuse; 

 corollas dull white. &-7 mm. long; pappus-squamellae 8, unequal, obtuse, 3-4 

 mm. long. Dry places: Utah. Son. 



?• C. achilleaefolia H. & A. Stem 1-2 dm. high, densely white-tomentose; 

 leaves twice pinnately cleft with very short crow^ded obtuse divisions, perman- 

 ently white-tomentose; involucres 8-10 mm. high and 10-12 mm. wide, tomen- 

 tose; bracts linear, obtuse; corollas flesh-colored, all alike; pappus-squamellae 

 linear, acute, 5-6 mm. long. C. angustifoUa Greene, Dry soil and hot-spring 

 formations : Wyo. — Utah — Nev. — Ore. Je-Au. 



8. C. imbrlcata Greene. Stem branched at the base^ about 3 dm. high, 



floccose; leaves 5-10 cm. long, with narrow divisions, yellowish; involucres 10-12 

 mm. high, 12-15 mm. broad, viscid-pubescent; bracts linear, obtuse; corollas 

 flesh-colored or white, 6-7 mm. long; squamellae 8, oblong, obtuse, 4-5 mm. 

 long. Dry places: Wash. — Ida. — Ore. Son, 



9. C. cheilanthoides Greene. Stem about 3 dm. high; leaves 4-8 cm. long, 

 white-tomentose; involucres 8 mm. high, 10 mm. broad, floccose and glandular; 

 bracts linear or linear-spatulate, obtuse; corollas whitish, 6 mm. long; squamellae 

 8, linear, 5-6 mm. long, or those of the marginal flowers 2^ mm. long. Dry 

 places: Ore. — Ida. — ^Wasn. Son. 



10. C. hmnilis Rydb. Stems several from the crowTi; leaves 2-5 cm. long, 

 floccose, in age glabrate, oblanceolate in outline, with oblong round-lobed divi- 

 sions; involucres 7-8 nam. high, 5-10 mm. broad; bracts narrowly linear, obtuse, 

 glandular-puberulent; corollas whitish; squamellae 8, oblong, obtuse, about 3 

 mm. long. Dry places: Wyo. — Ida. Plain. 



