632 COMPOSITAE 
Bracts of the involucre in 2 to several series. 
Rays white, about 5 . . . . . . . Sericocarpus 
Rays many (6:to LOR a oc. t. bots cee Aster 
Bracts of the involucre in 1 or 2 series only. 
Rays -longer than the diameter of the disk . . Erigeron 
Rays not as long as the disk . . . . . - Leptilon 
Pappus (aigrette) distinctly double, one series of long bristles, 
another, outer, of short ones. 
Rays white, leaves lance-shaped . . . . Doellingeria 
Rays violet, leaves linear . . . . - « . JlOnagus 
Pappus a few scales and about 4 hairs, fruit flattened and 
winged 50040 2 ee ete PT ye? ele Se, ee rh 
Tripe 4, Inuleae 
Heads without ray florets except ZJnula. Anthers arrow-formed, the 
basal lobes prolonged into tails. 
Heads of flowers large with yellow rays . . . .- + + .- Inula 
Heads of flowers rayless. 
Receptacle) (chattys (7.9 ce ) sii MEGS She a0 2 eee 
Receptacle not chaffy. 
iPlaritenot: bWwoOlly” Js 04 Uo" choke ge tet eeette- an cera Pluchea 
Plants woolly. 
Staminate flowers on one plant, pistillate on another 
(dioecious) . 
Bristles of the aigrette of staminate flowers 'en- 
larged and thickened above, leaves in a cluster 
at base, stem leaves inconspicuous . . Antennaria 
Bristles of the staminate flowers not thickened 
above, leaves of stem linear . . . . Anaphalis 
Stamens and pistils in same flower, leaves of stem not linear 
eh ee ee a OM RE a SMe 
Tripe 5, Heliantheae 
Flower heads with ray flowers. Involucre leaf-like or herbaceous. 
Receptacle chaffy. Aigrette not hair-like, sometimes none. Anther 
not tailed at base. 
Ray flowers with pistils only, but producing fruit. Disk flowers with 
stamens and pistils, but with no fruit. 
Ray flowers in a single series . . . . .». »« + » 'Polymmig 
Ray flowers in 2 or more series... . . . - . #£=§ilphium 
Both ray and disk flowers with fruit. 
Ray flowers remaining on the fruit when mature . .  Heliopsis 
Ray flowers falling when mature. 
Aigrette represented by a number of scales. 
Aigrette absent or of one or two scales. Rays very short Eclipta 
Ray flowers not fruit producing, receptacle high, conical or 
columnar, 
