COMPOSITAE (COMPOSITE FAMILY) 



801 



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



less long) ; heads 6 nun. high ..... 85. A. amfthyxtlnut. 



Plant green and essentially glabrous; leaves and heads 



larger; bracts herbaceous, the outer often foliaceous 46. .!. novi-belgii. 

 Tips of bracts ascending, not recurved. 

 Bracts linear-oblong or lanceolate, linn, with dilated 



herbaceous tips ; rays deep blue or violet. 

 Leaves conspicuously clasping, the auricles generally 



meeting around the stem ..... 18. A. paten*. 



Leaves slightly or inconspicuously clasping . . . 81. A. concinnus. 

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



ored tips ; rays white or lavender . . . 42. A. paniculatus 



N. Bracts of the Involucre essentially equal, only the very outer- 



most sometimes broader and shorter. 

 Tips of bracts ac'ite (not attenuate), recurved-spreading or 



squarrose .......... 46. A. novi-belgit 



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



attenuate, ascending, not recurved. 

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



Involucre 5-S mrn. high ....... 45. A. longifoliut. 



Stem stout, glabrous or harshly pubescent; leaves lanceo- 

 late to narrowly rhoinbic-obovate ; involucre 7-12 mm. 

 high ... ...... 49. A. puniceut. 



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 ; achenes 

 smooth ........ . . . 16. 



Heads in a wand-like raceme ; achenes silky 

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

 Q. Involucre glandular-viscid ; rays violet R. 

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



17. 



A. sericeug. 

 A. concolor. 



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

 oles ; Involucral bracts erect . . . . . 7. A. Htrwyi. 

 Basal leaves narrower, on margined petioles ; involucre 



squarrose. 

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



1-1.5 cm. high, very glandular 8. A. , 



Low ; basal leaves lanceolate ; involucre mostly shorter, 



barely glandular 9. A. surculosua. 



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. A. grandiftorus 



Stem glandular-puberulent ; uppermost leaves and Invo- 

 lucral bracts distinct 13. A. oblongifolius. 



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

 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 turblnate-hemlspher- 



Ical 9. A. #ureulove. 



Bracts not ciliate, nearly or quite gUtbrous ; involucre 



slender-turbinate 10. A. gracilis. 



Leaves serrate 11. A. radula. 



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

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

 spicuously so T. 

 T. Stein-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 88. A. ericotdes 



Involucre turbinate, only 2-3 mm. broad . . 84. A. depauperatus 

 W. Bracts without firm subulate tips X. 

 X. Bracts with conspicuous elliptic or subrhombic 



green tips. 



Heads terminating minutely follose branchlets . 33. A. dumosus. 

 Heads paniculate or if few on leafy (not minutely 



foliose-bracteolate) branchlets . . . 48. A. talici/oliut. 

 X. Bracts attenuate, without conspicuous dilated tips. 

 Kays white (or lavender-tinged). 

 Branches ascending-paniculate ; heads in ra- 

 ceme-paniculate clusters. 



RAY'S MANUAL 51 



