COMI^OSITAE (composite FAMILY) 



801 



42. 



46. 



A. amethysii/tius, 

 A. nom-helgii. 



A. patens. 

 A. conoinnua. 



A. pcMviculatua. 

 A. novi-helgii. 



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



less long); heads 6 mm. high 36. 



Plant green and essentially glabrous; leaves and heads 



larger ; bracts herbaceous, the outer often foliaceous 46. 

 Tips of bracts ascending, not recurved. 



Bracts linear-oblong or lanceolate, firm, with dilated 

 herbaceous tips ; rays 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 . . . , 

 J\r. Bracts of the involucre essentially equal, only the very outer- 

 most sometimes broader and shorter. 

 Tips of bracts acite (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 5-8 mm. high 46. ^4. longifol^e. 



Stem stout, glabrous or harshly pubescent ; leaves lanceo- 

 late to uarrowlv rhombic-obovate ; Involucre 7-12 mm. 



high . _ . 49. ^- puniceus. 



T. 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. ^. eeWoewe. 



Heads in a wand-like raceme ; achenes silky . . . .17.-4. eoncolor. 

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

 Q. Involucre glandular-viscid ; rays violet B. 

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



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

 oles ; involucral bracts erect 7. A. Rerveyi, 



Basal leaves narrower, on margined p^ioles ; involucre 

 squarrose. 

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



1-1.5 cm. high, very glandular 8. ^- Kjyectabilia. 



Low ; basal leaves lanceolate ; involucre mostly shorter, 



barely glandular Q. A. 8ureulo8V8. 



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 



Stem glandular-puberulent ; uppermost leaves and invo- 

 lucral bracts distinct . 



Leaves thin, lanceolate, acuminate, subentire to serrate . 

 g. Involucre not glandular 8. 

 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 



Leaves serrate 



Invoiucfal bracts linear or linear-subulate, thin . 

 ^. None of the leaves definitely petioled, or the lOwer incon- 

 spicuously so T. 

 T. Stem-leaves linear TT, 

 U* Stem glabrous or glabrate, or only slightly pubescent 

 above Y. 

 Y. Involucre 5 mm. or less high W. 

 W. Bracts with definite firm subulate tips. 



Involucre hemispherical or campanulate, as broad 



as high 88. ^. ericoidea. 



Involucre turbinate, only 2-S rnm^. broad . . 84. A. depavperatita 

 W. Bracts without firm subulate tips X. 

 X. Bracts with conspicuous eUiptic cir subrhomblc 

 green tips. 

 Heads terminating minutely foliosebranchlets . 33. A.dtwioeua. 

 Heads paniculate or if few on leafy (not minutely 



folio se-bracteolate) branchlets . . ■ 43. ^. aaUcifolim. 

 ^. Bracts attenuate, without conspicuous dilated tips. 

 Rays white (or lavender-tinged). 

 Branches ascending-paniculate ; heads in ra* 

 cemo-pautoulate clusters. 



12. A. gra/ndiflorus 



A. oblongifoliue 

 A. modeatua. 



9. A. /rareutoauc. 



A. gracilis. 

 A, radula. 

 A. tardiJioT^s, 



