CHICORY FAMILY 1025 



Leaves hairy. 



Involucres more sparing! j- and usually short-hirsute; peduncles and 

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



6. C. riincinata. 

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

 lar-hirsute; involucre over 1 cm. high. 7. C. platyphijUa. 

 Leaf-blades otaovate to elUptic; involucres and peduncles densely glandular- 

 hispid with long hairs. 

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



8. C. riparia. 

 Involucres 1 cm. or less high; leaves glabroiis or nearly so. 



9. C. denticulata. 

 Plant 1-2 dm. high; heads solitary, rarely 2 or 3. 10. C. alpicola. 



Plant more or less canescent or furfurascent, especially the leaves; heads mostly narrow, 

 often almost cylindric. 

 Involucres glabrous, 5-7-flowered. 



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



11. C. acuminata. 

 Leavesmoreor less twice dissected, with linear-filiform divisions. 12. C. sesilifolia. 

 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. yracilis. 

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

 Blade proper broadly lanceolate; lobes usually directed downward. 



13. C. intermedia. 

 Blade proper narrowly lanceolate to almost linear; lobes curved upwards 

 or spreading. 14. C. angustata. 



Leaves dissected to near the midrib into Unear-flhform divisions, the blade 

 proper or rachis scarcely broader than the divisions. 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. 



16. C. pumila. 

 Involucres and pedimcles with some black hairs intermixed with, the tomen- 

 tum ; 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 weU as the petioles usually hispid with 



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



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



19. C. atribarba. 

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



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

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

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

 bract-like, entire; involucre tm-binate, about 12 mm. high; bracts linear-lanceo- 

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

 Mountains: Colo. Submonl. — Mont. Jl. 



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

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

 runcinate-pinnatifid, with triangiilar 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. — Xev. — 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, 

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

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

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

 tains: S.D. — Colo. — Utah — Wyo. Submont. — Mont. Jl-Au. 



4. 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 apex, remotely sinuate-dentate, with divaricate 

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

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

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



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

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



