42 



ASTERACEAE 



Bellis — English Daisy 



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

 Leaves basal, spatulate ; heads usually double, white to pink 



B. percnnis 



Erigeron — Daisy 



(Gr. eri-, very, geron, old man, referring to 



1. Heads 2-3 mm. wide; rays inconspicuous 



2. Heads 5-20 mm. wide ; rays conspicuous 



a. Rays 40-70 



b. Rays 100-150 



Callistephus — Garden Aster 



(Gr. 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. Low'er 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 



Doellingera — Doellingera 



(Named for Doellinger, a botanical explorer) 

 Leaves lanceolate ; rays small, white 



the hoary he&Js) 



E. canadensis 



E. dnnuus 



E. philadelphicus 



C. chine nsis 



A. 



divaricdlus 



A. 



macrophyllus 



A. 



azureus 



A. 



cordijolius 



A. 



sagittifolius 



A. 



Drummondii 



A. levis 



A. junceus 

 A. longijolius 

 A. levis 



A. patens 



A. novae-dngliae 



A. puniceus 



A. ptarmacoides 



multiflorus 

 ericoides 



A. oblongifolius 



A. Tradescdnti 

 A. salicifdlius 

 (incl. A. paniculdtus) 



D. umbel lat a 



