1004 CARDUACEAE 



I. Parryaxa, 



Flowers light, not pinkish; leaves glabrate. 



FlowOTS light greenish yellow; leaves arachnoid, but not tomentose beneath. 



1. C. Parryi. 



Flowers wliitish; leaves somewhat tomentose beneath. 2. C. araneosiim. 



Flowers pinkish; leaves densely wliite-tomentose beneath. 3. C. scariosum. 



II. Ehiocephala. 



Anthers glabrous. 



Leaves densely tomentose on both sides. 4. C. subniveum. 



Leave*? not densely tomentose on both sides. 

 FlowtTs ochroleucous or white. 



Leaves with very short or no lobes and numerous almost parallel spines along 



the margins, not crisp. 6. C. Kelseyi. 



Lca\ es with deep divisions, often again lobed, crisp, and with the spines point- 

 ing in various directions. 

 Leaves white-tomentose beneath. 



Involucre densely arachnoid; bracts all narrowly linear-lanceolate. 

 Heads not nodding, scattered on short branches in the axils of the 



leaves. 6. C. Hookerianum. 



Heads in a terminal dense cluster, at first nodding. 



7. C. scopulorum. 

 Involucres only slightly arachnoid; outer bracts lanceolate. 



25. C. oreophilum. 

 Leaves glabrous on both sides; heads clustered in an elongate leafy spike. 



_,, 8. C polyphyUum. 



Flowers purple or pink. 



Involucre densely arachnoid ; bracts rarely spinulose-ciliate. 



Heads 3.5-4 cm, high. 4-6 cm. broad, not densely clustered; coroUa red- 



purple. 9. C. eduJe, 



Heads 2.5-3 cm. high and about as broad. 



Heads sessile at the end of the stem; bracts linear-subulate; corolla 



purple. 10. C. Macounii. 



Heads scattered; bracts lance-subulate; corolla pink. 



11. C. TweedyL 

 Involucres only shghtiy arachnoid if at all; bracts except the innermost spinu- 

 » *. ^ lose-ciliate. 11. C. Eatonii. 



Anthers pubescent. 12. C. hesperium, 



III. L-\.NCEOL.A.TA. 



One species. 13. c. lanccolaium, 



IV. Neomexicana. 



Leaves densely white-tomentose; heads 3.5-6 cm. lilgh, 4-8 cm. broad; bracts strongly 

 squarroso, the outer reflexed. 14. C. ncomcxicanum. 



Leaves loosely floccose; heads 3-3.5 (rarely 4) cm. high. 3.5-5 cm. broad; bracts spreading 

 only m age. 15. c. hevadense. 



V. Carlinoidia. 



Flowers ochroleucous or white; bracts without glutinous ridge. 



Leaves pinnately divided. 16. C. Centaureae. 



Leaves merely smuately lobed, the upper with broad clasping bases 



Flowers red. ^^- ^^ laterifolium. 



Bracts without glandular ridge; leaves deeply lobed, with lanceolate divisions. 



T>« «* _j*i- 11. . . , 18. C. vernale. 



Bracts with glandular ridge; leaves slightly lobed, with broadly triangular lobes. 



19. C. perplcxans. 



VI. Leiocephal.\. 



Leaves green on both sides, glabrous or arachnoid beneath. 



Leaves crisp and very spmy; involucral bracts verj^ spiny, the outer ones as long as 



the inner; coroUas rose or pink. 20 C Eatoni 



Leaves almost flat, ^nth weak spines; involucral bracts weU imbricate, tlie outer 

 ones short and with short spines. oi c claratum 



Leaves tomentose beneath; mvolucral bracts with strong flat spines. " " 



39. C. griseum, 



VII. FOLIOSA. 



Inner bracts with scarcely dilated, not erose Unear-lanceolate tins 

 Heads 3.5-5 cm. high. ' 



Leav^ deeply pinnatifid, with strong spines, 23. C. coloradense. ' 



Leaves nearly entire, spmulose-ciliate. 24 C Hutipri 



Heads 2-3.5 cm: high. ^^' ^- ^""'^'^»- 



Leaves green, distinct! v decurrent. 



Lobes of the leaves lanceolate or triangular. 33. C. calcareum. 



Lobes of the leaves semi-orbicular. 34 c lactucinum 



Leav^ moreor^less tomentose beneath, scarcely decurrent. 



^„ «^ ^„^ „v-„-* .„..^- ^^^. spij^^ 25. c. spathulatum. 



J" 



broad 



