ASTERACEAE 



3<> 



2. Leaves pinnately divided 



a. Annual; fertile heads clustered; involucre spiny ./. :>• mi .'Mia 



b. Perennial; fertile ilitary; involucre naked or warted ./. ya 



Bidens -Bidcns, Beggar-ticks 



1 1 at. bi-, two, dens, tooth, from the awned 



1. Heads yellow 



a. Ilea. Is nodding alter flowering hiuj 



b. I leads al» 



(I) Rays conspicuous; heads 4 6 cm. wide /•'. . 



dl or wanting; heads 14 cm. wide 



(a) 1 t divided 



\. t Hiter bracts 2-4 times longer than head />'. com6sa 



y. (>uter bracts not longer than head />'. conndta 



(b) Leaves pinnately 3-5-divided /'. frondosa 



2. Heads red B. atrosanguinea 



Centaurca — Bachelor's Button, Bluebottle 



(Or. name of the centaury) 



He i.l of bluebottle, Centaurea, with long section, and two kinds of flowers. 

 Leaves gray, linear; rays blue, more rarely white or pink C. cyanus 



