103 2 CICHORIACEAE 



glabrous- involucres turbinate, about 15 mm. high; bracts linear-lanceolate; cor- 

 ollas yellow, turning pink in drying. T. parviflorum Nutt. Meadows: Man. 

 N.D. Colo Utah Wash. Plain Submont. Je-Au. 



15. A. rosea (Nutt.) Greene. Leaves 7-15 cm. long, pinnatifid, with linear 

 divisions, caudate-acuminate, glabrous; scape 1-1.5 dm. high, decumbent or 

 ascending, glabrous: involucres about 15 mm. high, slightly villous at the base; 

 bracts lanceolate to linear-lanceolate; corollas yellow, turning rose-colored. T. 

 roseum Nutt. Plains and table-lands: Colo. Wyo. Submont. My-Jl. 



16. A. laciniata (Nutt.) Greene. Leaves linear or lance-linear in outline, 

 pinnatifid with narrow, lanceolate or linear divisions, glabrous or slightly villous, 

 when young; scape 1-2 dm. high; involucres turbinate, slightly villous below, 

 about 15 mm. high; bracts linear-lanceolate or lanceolate; corollas light yellow, 

 turning rose-colored. Stylopappus laciniatus Nutt. Troximon arachnoideum A. 

 Nels., not A. arachnoidea Rydb. Meadows and valleys: Wyo. Colo. Calif. 

 B.C. Submont. Mont. Je-Au. 



17. A. montana Osterhout. Leaves oblanceolate, 1-2 dm. long, glabrous 

 or slightly villous when young, entire or dentate, dark green; scapes 1-3 dm. 

 high, woolly beneath the head and at the base; involucres campanulate, about 3 

 cm. high, more or less villous; flowers yellow. Mountains: Colo. Wyo. Mont. 

 Subalp. Jl-S. 



18. A. arachnoidea Rydb. Leaves 1.5-2 dm. long, more or less runcinate- 

 lobed, oblanceolate in outline, long-attenuate at the apex, densely floccose when 

 young; scape 1.5-4 dm. high, densely woolly above; head 2-2.5 cm. high, 1.5-2 

 cm. broad; bracts in about 3 series, linear-lanceolate, long-attenuate; flowers at 

 least in age rose-purple. Hills: Colo. Submont. Mont. Je-Jl. 



19. A. elata (Nutt.) Greene. Leaves thickish, oblanceolate in outline, 

 dentate or pinnatifid, with lanceolate divisions, somewhat villous, especially 

 when young, or glabrate; scapes usually several, robust, 3-5 dm. high, villous, 

 especially under the heads; involucres campanulate, villous especially below; 

 bracts linear-lanceolate or the outer lanceolate, all gradually acute; corollas 

 yellow. T. Nuttallii Greene. T. elatum A. Nels., not Greene. Low ground: 

 Mont. Colo. Calif. B.C. Submont. Mont. Je-Au. 



20. A. purpurea (A. Gray) Greene. Leaves linear or linear-oblanceolate, 

 glaucous and glabrous, at least in age, dentate or pinnatifid; scape 1-2 dm. 

 (rarely 3 dm.) high, villous, especially under the heads; involucres turbinate, 1.5 

 cm. high, or in fruit fully 2 cm. high; outer bracts oblong and obtuse, the inner 

 linear-lanceolate, acute; flowers orange, turning purple. T. aurantiacum pur- 

 pureum A. Gray. Mountains: Colo. N.M. Ariz. Utah. Submont. Mont. 

 Jl-Au. 



21. A. graxninifolia Greene. Leaves glabrous, somewhat glaucous, narrowly 

 linear, from entire to pinnatifid with linear lobes, long-attenuate; scape about 3 

 dm. high, villous under the head; involucres turbinate, about 2 cm. high, villous 

 at the base; bracts lanceolate or linear-lanceolate, acute to long-attenuate; flow- 

 ers orange, drying purple. T. gracilens Greenei A. Gray. A. Greenei Rydb., not 

 A. Greeneana O. Kuntze. Meadows: Alta Ariz. Utah B.C. Submont. 

 Subalp. 



22. A. gracilens (A. Gray) Kuntze. Leaves oblanceolate, rarely linear ii> 

 outline, usually entire or some with a few short lobes, 1-2 dm. long; scape slender, 



v?\ T 1 ' villous below the head; involucres turbinate-campanulate, 18-20 

 am. high; bracts linear-lanceolate, acute or acuminate; flowers orange, turning 

 P u f ple - V 9tilens A. Gray. A. gracilenta Greene. Meadows and hillsides: 

 Alta. Colo. Utah B.C. Plain Subalp. 



23. A. nana Rydb. Leaves spreading or ascending, oblanceolate or linear- 

 omanceolate, 6-10 cm. long, entire or denticulate, glabrous or slightly hairy on 

 the slwrt petioles; scape 1-1.5 (seldom 2) cm. high, slightly villous below the 

 nead; involucre 1.5-2 cm. high; bracts linear-lanceolate, slightly villous-ciliate ; 



arolla rose-purple or at first orange. A. humilis Rydb., not Kuntze. Moun- 

 tains: Colo. Wyo. Mont. 



