CHICORY FAMILY 1025 



Leaves hairy. 



14. C. angustata. 



involucres more sparingly and usually short-hirsute ; peduncles and 

 stem usually glabrous; involucres less than 1 cm. high. 



Involucres, peduncles, and usually also the stem, copiously glandu- 

 r z. 1,, ^ lar-hirsute; involucre over 1 cm. high. 7. C. vlatvnhvUa 



Leaf-blades obovate to elliptic; involucres and peduncles densely glaidular- 



hispid with long hairs. ^ ^ c*i±uuid.i 



Involucres over 1 cm. high; leaves hah-y, 1.5-2 dm. long. 



Involucres 1 cm. or less high; leaves glabrous or nearly so.* ' ^ 



Plant 1-2 dm. high; heads solitary, rarely 2 or 3. lo! a ilptlT^""' 



i'lant ^^^^^^j^^^j^^ cane^^^ furfurascent. especially the leaves; heads mostly narrow. 



Involucres glabrous, 5-7-flowered. 



Leaves lanceolate in outhne. pinnately lobed, with lanceolate to linear lobes. 



Leaves more or less twice dissected, with linear-fihform divisions. 12." c\ sesilifoHa" 

 Involucres canescent. ^ 



Involucres cylindric; principal bracts of the involucres 5-8 (rarely 9-14)- flowers 



of the same number; bracts not black-hairy, except sometimes in c! gracilis 

 Leaves not divided to near the midrib; blade proper wider than the lobes 

 Blade proper broadly lanceolate; lobes usually directed downward. 



v., , , , , 13. C intermedia. 



liiaae proper narrowly lanceolate to almost Unear; lobfis mrx-pH nnwanri.^ 



or spreading. 



Leaves dissected to near the midrib into hnear-fiUform c.^. ., ...^ .^i«^c 



proper or rachis scarcely broader than the di\^sions. 15. C gracilis 

 Involucres campanulate; principal bracts of the involucres 9-18; flowers 10-20- 



plant low. 



Involucres and peduncles without black hairs; achenes nearly columnar. 



Involucres and peduncles with some black hairs intermixed with the^tomen- 



turn; achenes more or less fusiform. 



Hairs glandular. 17. c. occidentalis. 



Hairs not glandular. 



Achenes ribbed, at maturity brown or almost black. 



Stem low. 1-2 dm. high, as well as the petioles usually liispid with 



yellow hairs; leaves not long-acuminate. 18. C. subacaulis 



Stem tall, 4-5 dm. high, not hispid; leaves long-acuminate. 



AT, 4- -n 1 X X .. . , 19. C. atribarba. 



Achenes not ribbed at maturity, greenish or reddish. 20. C. scopulorum. 



1. C. tomentulosa Rydb. Stem scape-like, 4r-5 dm. high; basal leaves gla- 

 brous and glaucous, 1-1.5 dm. long, oblanceolate in outline, acute, sessile, den- 

 tate, with sharp salient or reflexed teeth; stem-leaves, if any, linear-lanceolate, 

 bract-hke, entire; involucre turbinate, about 12 mm. high; bracts linear-lanceo- 

 late, acuminate, with dark backs, and with a few calyculate ones at their base 

 Mountains: Colo. SubrnonL—MonL Jl. ' 



2. C. glauca (Nutt.) T. & G. Stem scape-like, 3-6 dm. high, glabrous; 

 leaves oblanceolate in outline, tapering below into short petioles, more or less 

 runcinate-pinnatifid, with triangillar or lanceolate lobes or sometimes entire, 

 glabrous and somewhat glaucous; involucres turbinate, about 1 cm. high; bracts 

 narrowly linear-lanceolate, acute, glabrous. C. lancifolia Greene. Valleys: Sask. 

 —Colo.— Nev.— Alta. Plain—Mont. Je-Au. 



3. C. petiolata Rydb. Stem with 1-3 leaves, glabrous and often purplish 

 below, more or less glandular-hirsute above; basal leaf-blades usually obtuse, 

 smuate-dentate or entire, about 1 dm. long, glabrous and glaucous; stem-leaves 

 oblanceolate and iisually sessile; involucre about 12 mm. high, turbinate-cam- 

 panulate, with glandular black hairs; bracts linear-lanceolate, acuminate. Moun- 

 tains: S.D.— Colo.-^Utah— Wyo. SahmonL—MonL Jl-Au. 



. *' C, glaucella Rydb. Stem slender, about 3 dm. high, glabrous and shin- 

 ing; basal leaves glabrous and shining, somewhat glaucous, thin, 5-10 cm. long; 

 blades oblanceolate, acute at the npex, remotely sinuate-dentate, with divaricate 

 or retrorse short teeth, or entire; stem-leaves 1-2, much reduced, 1-2 cm. long, 

 linear or nearly so; involucre turbinate, sparingly hirsute; bracts linear-lanceo- 

 late, acuminate. Wet meadows: Sask.— :Mont.— Colo. SubmonL—MonL Jl-S. 



5. C. perplexans Rydb. Stem scape-like; leaves about 1 dm. long, glaucous 

 and glabrous or rarely with a few hairs on the midrib below and on the margin, 



