4 2 



ASTERACEAE 



Belli 



•English Daisy 



Leaves basal, spatulate ; 



(Lat. bellis, daisy, from bellus, beautiful) 

 heads usually double, white to pink 



B. perennis 



(Gr. eri-, 



1. Heads 2-3 mm. wide; 



2. Heads 5-20 mm. wide 



a. Rays 40-70 



b. Rays 100-150 



Erigeron — Daisy 



very, geron, old man, referring 

 rays inconspicuous 

 ; rays conspicuous 



to the hoary heads) 



E. canadensis 



Callistephus — Garden Aster 



ulr. kalli-, beautiful, stephos, wreath) 

 Double asters of the garden 



Aster — Aster 



(Gr. aster, star, in reference to the head) 



1. Lower leaves heart-shaped, petioled 



a. Rays white, violet or pink 



(1) Rays white, 6-10 



(2) Rays violet, 5-16 



b. Rays blue to purple 



(1) Leaves entire 



(2) Leaves toothed 



(a) Stem smooth 



x. Heads 4-6 mm. high; leaves hairy 

 y. Heads 6-10 mm. high; leaves smooth 



(b) Stem finely hairy 



2. Lower leaves not petioled and heart-shaped 



a. Stem leaves clasping by a heart-shaped base 



(1) Stem smooth or nearly so 



(a) Leaves entire 



x. Leaves oblong to ovate 



y. Leaves linear or lance-linear 



(x) Bracts of the involucre in 3-4 rows 



(y) Bracts of the involucre in 1-2 rows 



(b) Leaves toothed 



(2) Stem rough or hairy 



(a) Leaves entire 

 x. Stem rough 

 y. Stem hairy 



(b) Leaves toothed 



b. Leaves sessile, slightly or not at all clasping 



(1) Leaves densely silky-silvery, entire; rays blue 



(2) Leaves not silky-silvery 



(a) Stem leaves linear, entire 

 x. Heads 16-25 mm. wide 

 y. Heads 6-12 mm. wide 



(x) Heads in 1-sided racemes 

 (y) Heads not in 1-sided racemes 



(b) Stem leaves oblong to lanceolate 

 x. Stem and leaves hairy 



y. Stem and leaves not hairy 

 (x) Heads 10-15 mm. wide 

 (y) Heads 15-25 mm. wide 



Leaves lanceolate; 



Doellingera — Doellingera 



(Named for Doellinger, a botanical explorer) 

 rays small, white 



annuus 



philadelphicus 



C. chi 



divaricatus 

 macrophyllus 



cordijolius 

 sagittifolius 

 Drummondii 



A. lev is 



A. junceus 

 A. longi/dlius 

 A. levis 



A. patens 



A. novae-dngliae 



A. puniceus 



A. sericeus 



A. ptarmacoides 



A. multiflorns 

 A. ericoides 



A. oblongifolius 



A. Tradescdnti 

 A. salicij alius 

 (inch A. paniculdtus) 



D. umbelldta 



