THISTLE FAMILY 843 



heads similar to those of the preceding, mostly clustered in the axils. B. tenera 

 A. Gray. Canons: N.M. Utah Nev. Ariz.; Mex. Submont. 



6. C. brachyphyllus (A. Gray) Kuntze. Stem slender, from, a slightly 

 woody caudex; leaves lanceolate, acute, slightly serrate or entire, 1-4 cm. long, 

 3-nerved; inflorescence lax; heads about 1 cm. high, 4 mm. thick, about 9-flowered; 

 bracts 16-17, acuminate, 5-7-striate, ciliolate; achenes hirsute; pappus-bristles 

 short-plumose. B. brachyphylla A. Gray. Hills: N.M. sw Colo. Ariz. Son. 

 Svbmant. 



7. C. microphyllus (Nutt.) Kuntze. A shrub, 3-6 dm. high, with ascending 

 branches, densely short-pilose and glandular; leaves round-ovate, dentate, thick, 

 1-2 cm. long, densely glandular-puberulent ; heads obconic, 12-14 mm. high; 

 lower bracts ovate, thick; the inner two rows linear; achenes 4-4.5 mm. long, 

 hispidulous on the angles. B. microphylla (Nutt.) A. Gray. Dry soil: Ore. 

 Ida. Calif. Son. Submont. Au. 



8. C. Watsonii (B. L. Robins.) Rydb. Shrubby, 4-6 dm. high; stem and 

 peduncles softly lanulate or crisp-puberulent ; branches spreading; leaves as in 

 preceding species; head about 11 mm. high, 18-flowered; achenes about 3.5 mm. 

 long. B. Watsonii B. L. Robins. Mountains: Utah Nev. Calif. Submont. 



9. C. scaber (A. Gray) Greene. A shrub 4-6 dm. high, with slender ascend- 

 ing branches, scabrous-puberulent and more or less viscid; leaves sessile, broadly 

 ovate, coarsely dentate, 5-10 cm. long, 3-ribbed, scabrous; heads obconic, 1 cm. 

 high; bracts thin, the lower lanceolate, the inner linear, erect, wholly chartaceous; 

 flowers 10-12; achenes scabrous-hispidulous on the angles. B. microphylla 

 scabra A. Gray. Mountains and dry soil: s Wyo. N.M. Ariz. Nev. Sub- 

 mont. 



10. C. oblongifolius (Nutt.) Kuntze. Perennial, with a cespitose woody 

 caudex; stems 2-4 dm. high, straw-colored, puberulent; leaves elliptic, oblong, 

 or linear, glandular-puberulent, firm, more or less triple-nerved; heads about 2 

 cm. high, obconic-campanulate; bracts glandular-puberulent, acute, the outer 

 ovate-lanceolate, the inner linear. B. oblongifolia Nutt. River banks: B.C. 

 Mont. Utah n Calif. Je-Au. 



11. C. linifolius (D. C. Eat.) Kuntze. Perennial, with a cespitose woody 

 caudex; stems 2-4 dm. high, densely short-pubescent, subvelutinous ; leaves 

 linear-lanceolate or linear, densely puberulent; heads obconic-campanulate, 

 about 15 mm. high; bracts linear-lanceolate or linear, attenuate, thin. C. humilis 

 Greene. Brickcllia linifolia D. C. Eat. Dry places: Calif. s Colo. N.M. Son. 

 Submont. My-Jl. 



12. C. longifolius (S. Wats.) Kuntze. Suffruticose perennial; branches 

 leafy, straw-colored; leaves lance-linear, 3-nerved, 2-7 cm. long, 4-6 mm. wide; 

 heads 5-6 mm. long, obconic; bracts oblong to linear, obtuse; achenes glabrous 

 or nearly so. B. longifolia S. Wats. Dry regions: Ariz. s Utah s Nev. 

 Calif. Son. 



5. KUHNIA L. FALSE BONESET. 



Perennial herbs, with alternate resinous-dotted leaves. Heads discoid, 

 cymose-corymbose with white or purplish flowers. Involucre narrow, turbinate- 

 campanulate, its bracts striate, imbricate in several unequal series. Disk-corollas 

 regular; tube slender; limb 5-cleft. Anthers obtuse and entire at the base, almost 

 distinct. Receptacle flat, naked. Style-branches thickened upwards, obtuse, 

 stigmatic only at the base. Achenes 10-20-costate. Pappus simple, of numerous 

 plumose bristles. 



Leaves oblong or lanceolate, 3-ribbed, more or less toothed. 

 Leaves densely puberulent beneath. 



Inner bracts abruptly acute or cuspidate. 1. A. gluhnosa. 



Inner bracts gradually acuminate. 

 Leaves glabrous or nearly so beneath. 

 Leaves linear, 1-ribbed, entire. 4. K. leptophylla. 



1. K. glutinosa Ell. Stem erect, 3-6 dm. high, puberulent and somewhat 

 viscid; leaves sessile, lanceolate or ovate-lanceolate, puberulent on both sides, 



