COMPOS IT A E (composite FAMILY) 



801 



Plant cinereous-pubescent, with small leaves (5 cm. or 

 less long) ; heads 6 mm. high 



35. 



46. 



18. 

 31. 



45. 



49. 



16. 



17. 



Plant green and essentially glabrous ; leaves and heads 

 larger; bracts herbaceous, the outer often foliaceous 

 Tips of bracts ascending, not recurved. 



Bracts linear-oblong or lanceolate, firm, with dilated 

 herbaceous tips ; ravs deep blue or violet. 

 Leaves conspicuously clasping, the auricles generally 



meeting around the stem 



Leaves slightly or inconspicuously clasping . 

 Bracts linear-attenuate, thin, with slender green or col- 

 ored tips ; rays white or lavender . . . . 

 jr. Bracts of the involucre essentially equal, only the very outer- 

 most sometimes broader and shorter. 

 Tips of bracts acute (not attenuate), recurved-spreading or 



squarrose 



Tips of bracts (except occasional outer foliaceous ones) long- 

 attenuate, ascending, not recurved. 

 Stem slender, glabrous or villous ; leaves long-lanceolate ; 



involucre 5-5i mm. high 



Stem stout, glabrous or harshly pubescent ; leaves lanceo- 

 late to narrowlv rhombic-obovate ; involucre 7-12 mm. 



high ... 



K. Stem-leaves narrowed or rounded or cordate at base, but not 

 clasping P. 

 P. Leaves silvery-silky on both faces, entire. 



Heads solitary or few at the tips of the branches ; aclienes 

 smooth ........... 



Heads in a wand-like raceme ; achenes silky .... 



P. Leaves green, not silvery-silky, sometimes pilose or villous Q. 

 Q. Involucre glandular-viscitl ; rays violet R. 

 R. Basal leaves petioled, much larger than the cauline. 



Basal leaves ovate or ovate-oblong, on nearly naked peti- 

 oles ; involucral bracts erect 



Basal leaves narrower, on margined petioles ; involucre 

 squarrose. 

 Tall ; basal leaves spatulate- to lance-oblong ; involucre 



1-1.5 cm. high, very glandular 8. 



Low ; basal leaves lanceolate ; involucre mostly shorter, 



barely glandular 9. 



R. Basal and stem-leaves uniform, linear to oblong, the lower 

 not conspicuously petioled. 

 Leaves firm, linear- to lance-oblong, entire, blunt or 

 acutish. 

 Stem hispid ; uppermost leaves passing into involucral 



bracts 12. 



Stem glandular-puberulent ; uppermost leaves and invo- 

 lucral bracts distinct . 13. 



Leaves thin, lanceolate, acuminate, subentire to serrate . 15. 

 Q. Involucre not glandular S. 

 S. Basal leaves with definite margined petioles. 

 Involucral bracts oblong, coriaceous. 

 Leaves entire or slightly dentate. 

 Bracts strongly ciliate ; involucre turbinate-hemispher- 



ical 



Bracts not ciliate, nearly or quite glabrous ; involucre 



slender-turbinate 10. 



Leaves serrate 11. 



Involucral bracts linear or linear-subulate, thin . . .47. 

 S. None of the leaves definitely petioled, or the lower incon- 

 spicuously so T. 

 T. Stem-leaves linear U. 

 U. Stem glabrous or glabrate, or only slightly pubescent 

 above V. 

 V. Involucre 5 mm. or less high W. 

 W. Bracts with definite firm subulate tips. 



Involucre hemispherical or campanulate, as broad 



as high as. 



A. ainethy.stina9. 

 A. novi-belgii. 



A. patens. 

 A. concinnus. 



42. A. paniculatus 



46. A. novi-belgii. 



A. longifolius. 

 A. puniceus. 



A. sericeus. 

 A. concolar. 



7. A. Herveyi. 



A. spectabilis. 

 A. sin'culosus. 



A. grandiflorus 



A. ohlongif alius. 

 A. modestus. 



9. A. surculosus. 



A. gracilis. 

 A. radula. 

 A. tardifl<yru$. 



Involucre turbinate, only 2-3 ram. broad . . 34. 

 W. Bracts without firm subulate tips X. 

 X. Bracts with conspicuous elliptic or subrhombic 

 green tips. 

 Heads terminating minutely foliose branchlcts . 38. 

 Heads paniculate or if few on leafy (,not minutely 



foliose-bracteolate) branchlets . . .43. 

 X. Bracts attenuate, withoiit conspicuous dilated tips. 

 Kays white (or lavender-tinged). 

 Branches a.scending-|ianiculate ; heads in r»- 

 cemo-pauiculute clusters. 



•ray's manual — 51 



A. ericoides. 

 A. depauperatus 



A. dumosus. 

 A. salici/olius. 



