946 CARDUACEAE 



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

 pinnate 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 

 young, 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 \vith enlarged throat and limb, oblique; pappus-squamellae 

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

 central ones and unequal. 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; corolla white, the marginal not 

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

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



5. 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 linear-oblong 

 squamellae, 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, 6-7 mm. long; pappus-squamellae 8, unequal, obtuse, 3-4 

 mm. long. Dry places: Utah. Son. 



7. C. achilleaefolia H. & A. Stem 1-2 dm. high, densely white-tomentose: 

 leaves twice pinnately cleft with very short crowded 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. angustifolia Greene. Dry soil and hot-spring 

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



8. C. imbricata 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 2-4 mm. long. Dry 

 places: Ore. Ida. Wash. Son. 



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

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

 sions; involucres 7-8 mm. 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. 



