CHICORY FAMILY 1035 



^^;^^J^eadows and hills: N.M.— Colo.— Utah— Ariz.; Mex. Suhmont.—Mont . 



4. L. dumetorum (Greene) Rydb. Leaves 1-2 dm. long, oblanceolate, 

 mostly erect, smuately toothed or lobed, glabrous or slightly hairy on the veins 

 teeth or lobes usually triangular; scape 1-4 dm. high; involucres 2-3 cm hieh* 

 inner bracts narrowly linear-lanceolate, dilated and bifid at the apex; achenes 

 olive-green; ribs spmulose at the summit, muricate below. T. dumetorum Greene 

 Mountain valleys: Man.— N.M.— Utah— B.C. Suhmont.—MonL My-Au. 



+1, ^^1^^ leiospermum Rydb. Leaves spreading, broadly oblanceolate, less 

 tnan 1 dm. long, dark green, obtuse or acutish, retrorse-dentate, rarely lobed ; 

 scape about 1 dm. high, slightly villous when young; outer bracts 7-10 mm. long, 

 lanceolate, with spreading tips, the inner linear, about tmce as long, neither 

 corniculate; achenes greenish. T. leiospermum Rydb. Mountains: Colo. Suh- 

 monL—Mont Jl-Au. 



r J' ^-.^riophorum Rydb. Leaves 2-3 cm. long, oblanceolate to spatulate, 

 Slightly smuately dentate or entire; scape 2-3 dm. high; involucres about 1.5 cm. 

 mgli,^ somewhat livid; calyculate bracts in a single series, ovate, erect, slightlv 



corniculate. T. eriophorum Rydb. Hills: Mont. SuhnConL . ' & ^ 



7, L. monticola Rydb. Leaves oblanceolate in outline, 6-12 cm long 

 trom dentate to sinuately lobed with triangular entire lobes, glabrous or nearly 

 so; scape 1-2 dm. high; involucres campanulate, 15-18 mm. high; bracts proper 

 linear-lanceolate, in 2 series, the inner ones with broad scarious margins; achenes 

 greenish or brown; ribs strongly spinulose above. T, montanum Nutt., not DC. 

 Mountains: Alta.— Colo. Submont.—MnnL .T^-An 



angustifolium 



r " -— V — / ^v^v*^.. ^v.^v^o wolong-lmear, 4-10 cm. long, 



ODtuse or mucronate, denticulate or dentate; scape decumbent, at last twice as 

 long as the leaves; involucre narrowly campanulate; achenes brown, spinulose 

 at the apex, smooth below the middle. T. angustifolium Greene. (?) T. fas- 

 ciculatum A. Nels. Meadows; Wyo.— Colo. Mont.— Alp. Jl-Au. 



9. L. ammophilum (A. NclS.) Rydb. Leaves decumbent, 1 dm. long or 

 less, glabrous, oblong or oblanceolate, sinuate-dentate; scape decumbent, about 

 as long as the leaves; involucres about 15 mm. high; bracts proper narrowly 



i*u!f. .^.^^^ , \ ^^JS^^^y scarious-margined; achenes dark red; ribs" spinulose 



' . Grassy valleys: Wyo. — 



above, tuberculate below. T. ammophilum 

 Colo. Mout.—Subalp. Je-Au 



10. L. rupestre (Greene) Rydb. Leaves narrowly oblanceolate in outline, 

 acute, runcmate-pinnatifid or runcinate-toothed, 3-8 cm. long; involucres nar- 

 rowly campanulate, dark livid green, 10-12 mm. high; proper bracts 10-15, in 2 

 series, lance-linear, the inner series with broad scarious margins; ribs of the 

 achenes spmulose at the summit, muricate below. T. rupestre Greene, (?) T. 

 ovmum Greene. High mountains: Alta.— Mont.— B.C. Subalp.—Alp, Jl-Au. 



.« ,11' !*• scopulorum (A. Gray) Rydb. Leaves 2-6 cm. long, sinuate-pinnat- 

 Jnd; scape 1-6 cm. high; involucres 6-8 mm. high, 5 mm. wide, dark livid green; 

 Dracte proper 8-12, in 2 series, oblong-linear, scarious-margined, often obtuse. 

 ^'Officinale scopulorum A. Gray. T, scopulorum Rydb. Alpine regions: Colo. 

 —Ida. MonL—Alp. Jl-Au. 



26. LACTUCA (Tourn.) L. Lkttuce. 



^ Tall leafy-stemmed herbs, with paniculate heads. Involucres cylindric, or 

 i'I-e; *^^iiic; bracts imbricate, in 3 or more series. Achenes obcompressed, 



5-nerved on the faces, contracted into a beak dilated at the apex. Pappus of 

 mmaerous capillary bristles, which fall off separately. 



Achenes with a slender beak; pappus white. 



uuter bracts (calyculum) not more than half as long as the bracts proper; flowers 



yellow. rareJy tinged with blue. 



Heads 6-15-flowered; achenes several-nerved, not rugose; leaves spinulose on the 



ribs. 



Leaves sinuate-dentate; achenes dark. 1. L. tirosa. 



Leaves smuately pinnatifld; achenes light colored, 2. L. Scariola. 



