40 



ASTERACEAE 



Anthemis — Chamomile. Mawseed 



(Gr. anthemis, Rower, perhaps referring to the many flowers) 



1. Rays while 



a. Rays pistillate 



(1) Chaff acute or pointed 



(2) Chaff blunt or rounded 



b. Rays without pistils 



2. Rays yellow 



A. arvensis 



A. nobilis 

 A. col iila 

 A. linctoria 



Galinsoga — Galinsoga 



(Named for Galinsoga, a Spanish botanist) 

 Low weed, with inconspicuous rays and broad leaves 



G. par'iflora 



Zinnia — Zinnia 



i Named for Zinn, a German botanist) 

 Cultivated annuals, generally with double or partly double flower heads of 



various shades of dull yellow, orange, red and purple Z. elegans 



Echinacea — Purple Coneflowcr 



(Gr. echinos, hedgehog, referring to the bristly head) 



1. Leaves dentate; rays 15-20, dull purple 



2. Leaves entire; rays 12-15, rose-purple 



Rudbeckia — Coneflower 



(Named for the .Swedish botanists, Rudbeck) 



1. Heads single 



a. Leaves entire or nearly so; disk purple-brown 



b. Leaves deeply cut, except the upper; disk yellow 



2. Heads doubled 



Ratihida — Coneflower 



(Of doubtful meaning) 



1. Disk cylindric, yellow 



2. Disk oblong, brown 



Dahlia — Dahlia 



(Named for Dahl. a Swedish botanist) 

 Roots tuberous, fascicled ; leaves pinnate ; flowers white to red 



Cosmos — Cosmos 



(Gr. kosmos, order, world) 

 Leaves twice pinnatifid ; flowers white to red, rarely yellow 



Coreopsis — Coreopsis. Tickseed 



(Gr. koris, bug, opsis, likeness) 



1. Leaves 2-pinnate ; rays often maroon 



2. Leaves 1 -pinnate or simple 



a. Annual ; leaves or leaflets oval 



b. Perennial ; leaves or leaflets lanceolate 



(1) Leaves with 3, sometimes 5, leaflets 



(2) Leaves simple 



3. Leaves palmately 3-lobed 



Silphium — Silphium 



(Gr. name of a resinous plant) 



1. Leaves simple, united at base into a cup 



2. Leaves very large, deeply pinnatifid 



E. purpurea 

 E. angusti/dlia 



R. hirla 



R. lacinidta 



R. lacinidta: golden glow 



R. columudris 

 R. pinndta 



D. variabilis 



C. bipinndtus 



C. linctoria 



C. Drummondii 



C. tripteris 

 C. lanceoldta 

 C. pahndta 



S. perfolidtum: cup plant 

 S. lacinidtum: compass 

 plant 



Yerbcsina 



(Of doubtful meaning) 

 Tall cultivated perennial with rough lanceolate leaves and yellow flowers; disk- 

 flowers large, campanulate y altcrnij6lia 



