1030 CICHORIACEAE 



Bracts not vrith purplish blotches, if at all purplish only along the midrib. 

 Leaves narrowly linear, glaucous, usually piimatifld with linear lobes. 



21. A. graminifolia. 

 Leaves oblanceolate, usually entire, rarely with short broad lobes or 

 teeth. 

 All bracts linear-lanceolate and acute. 



Plant tall, slender, 3-5 dm. high; leaves erect; heads 2-3 cm. 



liigh. 22. A. gracilens. 



Plant low, 1-3 dm. high; leaves spreading; heads 1.5-2 cm. 

 high. 23. A. nana. 



Outer bracts oblong or lanceolate, often obtuse. 



Plant low, 1 dm. high or less; inner bracts only sUghtly longer. 



24. A. cornea. 

 Plant taller, 3-5 dm. high; inner bracts much longer. 



25. A. auranliaca. 

 Flowers light yellow, but often turning pinkish; inner bracts elongate in age. 



Involucres 2-2.5 cm. in diameter; plant tall and stout, scarcely glaucous. 



19. A. elala. 

 Involucres less than 1 cm. in diameter; plant slender, glaucous. 

 Scapes tall, 2.5-4 dm. high, much exceeding the leaves. 



26. .4. arizonica. 

 Scapes low, about 1 dm. high, sUghtly if at all exceeding the leaves. 



27. A. leptocarpa. 

 Involucres of two distinct sets of bracts, the inner narrowly linear, 2-3 times as long 



as the ovate or oval outer ones ; beak 2-3 times as long as^ the body of the 

 achenes. 

 Leaves glabrous and glaucous, Unear or oblanceolate, acuminate, with linear 

 lobes, or entire. 

 Outer bracts oblong-obtuse; lobes of the leaves linear to lanceolate, acute. 



28 A. rostrata. 

 Outer bracts acute or acuminate; lobes of the leaves narrowly Unear. 



29. A. tenuifolia. 

 Leaves more or less pubescent, oblanceolate in outline. 



Leaves obtuse and with oblong-obtuse lobes. 30. A. obtusifolia. 



Leaves attenuate and with lanceolate, acute lobes. 31. A. grandiflora. 



III. Retrorsae. 

 One species. 32. A. rctrorsa. 



IV. Heterophyllae. 

 One species. 33. A. heterophylla. 



1. A. taraxacifolia (Nutt.) Dietr. Leaves oblanceolate or linear-oblanceo- 

 late in outline, usually more or less toothed or lobed, with lanceolate, salient teeth 

 or lobes, permanently villous, 1-2 dm. long; scape more or less villous; involucres 

 broadly campanulate, about 2.5 cm. high, 2.5-3 cm. broad, villous-tomentose 

 at the base; bracts all linear-lanceolate, villous -ciliate on the margins, with a 

 purphsh midvein and sometimes with purple blotches, the inner attenuate; flow- 

 ers yellow, turning pinkish; body of the achenes fusiform, about 1 cm. long, 

 gradually tapering into a striate beak 3 mm. long. Troximon taraxacifolium 

 Nutt. Meadows: Wash. — Ida. — Utah. Submont. Je-Jl. 



2. A. pubescens Rydb. Leaves narrowly oblanceolate, about 1 dm. long, 

 0.5-1 cm. wide, acuminate, slightly glaucous, but even in age villous-pubescent ; 

 scape 1.5-2 dm. high, sparingly villous; involucre about 2 cm. high and 1.5 cm. 

 wide, villous and somewhat viscid; bracts with a dark median line and sometimes 

 tinged with purple, the outer ones lanceolate to linear-lanceolate; flowers lemon- 

 yellow, the outer striate or tinged with purple. T. pubescens A. Nels. Moist 

 meadows and hillsides: Man.— Colo. — B.C. Plain — Submont. Je-Au. 



3. A. aspera Rydb. Leaves oblanceolate, 4-6 cm. long, often lobed or 

 toothed, permanently short-villous, with rather coarse hairs; scapes 3-10 cm. 

 high; involucres turbinate, 10-14 mm. high; bracts linear-lanceolate or the outer 

 lanceolate, acute, with a purplish midvein, villous throughout, with longer 

 hairs on the margins; flowers light yellow, turning pink, purple-veined. A. Leon- 

 lodon V. aspera and v. pygmaea Rydb. Mountains: Mont. — -Ida. — B.C. Mont. 

 — Siibalp. Jl. 



4. A. villosa Rydb. Leaves very villous, about 1 dm. long, broadly lanceo- 

 late or oblanceolate, entire or laciniately toothed, rather thick; scape stout, 1-3 

 dm. high, densely villous when young; involucres broadly campanulate or hemi- 

 spheric, 2 cm. high and 2-2.5 cm. broad; bracts densely villous, the outer oblong 

 or oblong-ovate, obtuse or acutish, the inner lanceolate, acute, with dark mid- 



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