CHICORY FAMILY 1027 



few black hairs along the midvein. C. occidentalis gracilis D. C. Eat. C. exilis 

 Osterhout. Hillsides and mountain slopes: Mont. — Colo. — Nev. — Ida. Son. — 

 Suhmont. Je— Au. 



16. C. pumila Rydb. Stem rather low and stout, 1.5-2 dm., rareh' 3 dm. 

 high, canescent-tomentose, leafy; basal leaves petioled; blades 8-10 cm. long, 

 broadly lanceolate, acute, laciniate-pinnatifid about halfway to the midrib, with 

 lanceolate-triangular lobes; the stem-leaves sessile; involucres eanescent, cam- 

 panulate, about 12 mm. high; principal bracts about 10, linear or linear-lanceo- 

 late. C. occidentalis costata A. Gray. Dry hillsides: Mont. — Wyo. — Utah — 

 Nev. Siibmont. My-Au. 



17. C. occidentalis Xutt. Stem stout, 1-3 dm. high, canescent-tomentose, 

 usually also glandular-hispid in the inflorescence; basal leaves petioled; blades 

 1-2 dm. long, broadly lanceolate or oblanceolate, runcinate-lobed or cleft, usually 

 about halfway to the midrib, canescent-tomentose, acute; lobes triangular or 

 lanceolate, often toothed; involucres campanulate, 12-15 mm. high: bracts 

 proper 9-14, tomentose. Plains and hillsides: Sask. — Colo. — Ariz. — Calif.— B.C. 

 Plain — Suhmont. My-Au. 



18. C. subacaulis (Kellogg) Coville. Stem 1-2 dm. high, striate, canescent- 

 tomentose as well as hirsute but not glandular; basal leaves petioled; cauline 

 leaves sessile, all pinnatifid or bipinnatifid, tomentose and somewhat hirsute on 

 the rachis and ribs; involucres campanulate, 12-15 mm. high; bracts proper 11- 

 17, lance-Unear, tomentose and usually with scattered bristles. C. occidentalis 

 subacaulis Kellogg. Dry hillsides: Calif. — Wyo. Son. — Submont. Je. 



19. C. atribarba Heller. Stem 4-5 dm. high, tomentose or in age glabrate; 

 basal leaves petioled; blades lanceolate, 1-1.5 dm. long, deeply pinnately lobed 

 or runcinate, with lanceolate or lance-linear divisions, canescent-tomentulose, 

 long-caudate; uppermost cauhne leaves much reduced and entire; involucres 

 campanulate, 12-14 mm. high, tomentoce; bracts linear, somewhat scarious- 

 margined, with scattered black bristles on the back. Hills: Mont. — ^Ida. Son. 

 — Submont. Je. 



20. C. scopulorum Coville. Stem 1-4 dm. high, scantily tomentose, usually 

 glabrate in age, bearing scattered glandless bristles; basal leaves petioled, pinnat- 

 ifid or bipinnatifid, with linear or linear-lanceolate divisions, tomentose and 

 also liirsute on the veins; heads corj-mbose, long-peduncled ; involucres cam- 

 panulate, 10-12 mm. high, sparingly tomentose, and sparingly greenish hispid; 

 calyculate bracts lanceolate, 2 mm. long; bracts proper 13-17, lance-linear. 

 Mountains: Mont. — Colo. — Nev. — Ore. Submont. My-Jl. 



21. HETEROPLEURA Schultz-Bip. 



Perennial leafy-stemmed herbs, of the habit of Hieracium. Involucre cam- 

 panulate; bracts in 1 or 2 series, subequal, narrow, with a few calyculate ones at 

 the base, not thickened on the back. Flowers light yellow. Achenes tapering 

 from the base to the summit, 10-ribbed, the alternating ribs much stronger. 

 Pappus of nmiierous dirty white soft bristles. 



1. H. FendIeri(Schultz-Bip.)Rydb. Stem scape-like, 2-3 dm. high, sparingly 

 setose-hirsute; basal leaves spatulate or obovate, with short wing-margined 

 petioles, setose-hirsute, the hairs long, with pustulate bases; stem-leaves few, the 

 upper or all reduced, narrowly linear, and bract-like ; heads rather few, racemif orm- 

 paniculate, long-peduncled, nodding in anthesis; involucres campanulate, 12-14 

 mm. high; bracts proper lance-linear, puberulent or glabrate, with or without a 

 few long hairs; achenes reddish or blackish. Heieropleura ambigua (A. Gray) 

 Schultz-Bip. Hieracium Fendleri Schultz-Bip. H. nigrocollinus S. Wats. Woods: 

 (Black HilLs) S.D. — N.M. — Ariz. Suhmont. — Mont. Je-Au. 



22. HIERACIUM (Tourn.) L. Hawkweed. 



Perennial, mostly caulescent herbs, with entire or dentate leaves and panicu- 

 late heads. Involucre cylindric or campanulate; bracts in 1-3 series, subequal 

 or somewhat imbricate, not thickened on the back, with a few small calyculate 



