950 CARDUACEAE 



appressed-tomentose; involucres 6-7 mm. high, 12-15 mm. broad, densely vil- 

 lous; bracts elliptic, rounded at the apex; ligules 8-10 mm. long, very strongly 

 veined; pappus-squamellae ovate, abruptly short-aristate. Dry hills: Sask. 

 Wyo. Ida. Plain. Je-Jl. 



3. T. acaulis (Pursh) Greene. Leaves crowded, narrowly linear-oblance- 

 olate, 2-8 cm. long, 2-6 mm. wide, mostly acutish; involucres 7-8 mm. high, 

 10-15 mm. broad, hemispheric, silky-villous; bracts linear to oblong, or spatu- 

 late, obtuse; ligules 6-8 mm. long, yellow with orange veins; pappus-squamellae 

 ovate, abruptly aristate. Galardia acaulis Pursh. Actinella acaulis Nutt. T. 

 incana A. Nels. T. eradiata A. Nels., a rayless form. Dry hills and plains: 

 N.D. Tex. N.M. Ida. Mont. Plain Submont. 



4. T. simplex A. Nels. Leaves green, sparingly appressed-pubescent, 

 glabrate in age, ascending or erect, 2-5 mm. wide, acute; involucres 12-18 mm. 

 broad, 8-10 mm. high, silky-villous ; ligules 8-10 mm. long, 4-7 mm. wide, golden 

 yellow, with orange veins; pappus-squamellae lance-ovate, abruptly aristate. 

 A. simplex A. Nels. Dry hills: S.D. Colo. Wyo. Plain. Je-Jl. 



5. T. trinervata Greene. Leaves 3-5 mm. long, 1-5 mm. broad, more or 

 less appressed-silky, with tufts of brown hairs at the bases; scape 5-15 cm. long, 

 appressed-silky ; involucres hemispheric, 5-6 mm. high, about 1 cm. broad, ap- 

 pressed-silky; bracts linear-oblong, obtuse; ligules about 8 mm. long; pappus- 

 squamellae ovate, aristate. Dry hills: N.M. Colo. Son. Submont. Jl-O. 



6. T. lanigera Daniels. Leaves numerous, linear-oblanceolate, 2-5 cm. 

 long, 2-5 mm. broad, somewhat silky when young, in age with loose brownish 

 pubescence, with tufts at their bases; scape 3-6 cm. long, loosely silky-villous; 

 involucres 10-15 cm. broad, 7-8 mm. high, villous; bracts oblong, obtuse; 

 ligules 8-10 mm. long; pappus-squamellae lance-ovate, rather gradually aristate. 

 A. lanata Nutt., not Pursh. Mountains: Colo. Wyo. Submont. Mont. Je-Jl. 



7. T. brevifolia Greene. Branches of caudex densely covered with the 

 scarious bases of old leaves; leaves narrowly oblanceolate, 1-2 cm. (rarely 2.5 

 cm.) long, 2-3 mm. wide, silky-villous, rather densely so; involucres about 7 mm. 

 high and 1 cm. broad or less, densely silky-villous; ligules pale yellow, with 

 orange veins, 5-7 mm. long; pappus-squameilae ovate, abruptly aristate, nearly 

 as long as the corollas. T. acaulis caespitosa A. Nels. Actinea integrifolia Torr., 

 notKunth. Foothills and mountains: Colo. Wyo. Submont. Mont. My-Je. 



8. T. Torreyana (Nutt.) Greene. Leaves narrowly oblanceolate or spatu- 

 late, 3-5 cm. long, 3-6 mm. broad, glabrous or with a few scattered hairs; scape 

 more or less villous, 3-8 cm. high; involucres 9-10 mm. high and about 15 mm. 

 broad; bracts linear, slightly villous and scarious-margined ; ligules 10-12 mm. 

 long, 3-6 mm. broad; pappus-squamellae lanceolate or lance-ovate, acuminate. 

 A. Torreyana Nutt. A. glabra A. Nels., not Nutt. Rocky hills: Wyo. Colo. 



-Utah. Plain Submont. My-Je. 



9. T. arizonica Greene. Leaves linear-oblanceolate, 3-5 cm. long, 3-6 mm. 

 wide, sparingly pilose; scapes 5-20 cm. long, appressed-pubescent or glabrate; 

 involucres about 8 mm. high and 15 mm. broad; bracts oblong or oval, obtuse, 

 villous, often with brownish margins; ligules 7-10 mm. long; pappus-squamellae 

 broadly ovate, abruptly aristate. T. pilosa Greene, a more glabrous plant. 

 Dry regions: Ariz. Nev. s Colo. N.M. Son. Submont. My-Jl. 



10. T. Crandallii Rydb. Leaves narrowly linear-oblanceolate, 4-6 cm. 

 long, 2-3 mm. wide, sparingly long-hairy, soon glabrate; scape 1-3 dm. long, 

 sparingly strigose; involucre hemispheric; bracts about 8 mm. long, linear- 

 oblong, silky; ligules about 15 mm. long; pappus-squamellae ovate, aristate. 

 Dry hills: Colo. Plain Submont. My-Je. 



11. T. epunctata A. Nels. Leaves glabrate or with few scattered hairs, 

 indistinctly punctate, narrowly oblanceolate, 2-4 cm. long; scape about 1 dm. 

 high, sparsely silky-strigose ; involucres about 8 mm. high and 15 mm. broad, 

 silky-villous; bracts elliptic or oblong; ligules bright yellow, 10-12 mm. long; 

 pappus-squamellae obovate, abruptly aristate. T. glabra Greene, in part. T. 



