THISTLE FAMILY 843 



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

 A. Gray. Canons: N.AI. — Utah — Nev. — Ariz.; Mex. Suhmont. 



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

 wood}' caudcx; 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. brachyiphijlla A. Gray. Hills: N.M. — sw Colo. — Ariz. Son. 

 — Suhmont. 



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. microphjlla (Nutt.) A. Gray. Dry soil: Ore. — 

 Ida. — CaUf. 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. Watsoyiii 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 hnear, erect, whoUy 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 h'near. 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. BrickcUia linifolia D. C. Evit. 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. vdde; 

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

 or nearlv so. B. longifolia S. Wats. Drv 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 

 pliunose bristles. 



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

 Leaves densely puberulent beneath. 



Inner bracts abruptly acute or cuspidate. 1. K. glutinosa. 



Inner bracts gradually acuminate. 2. K. Ilitchcockii. 



Leaves glabrous or nearly so beneath. 3. K. reticulata. 



Leaves hnear, 1-ribbed, entire. 4. A', leplophylla. 



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

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



