1	"At least some leaves palmately divided"	"Coreopsis verticillata"
1	"All leaves pinnately divided or lobed, or simple"	2
2	"Disk florets dark red"	"Coreopsis tinctoria"
2	"Disk florets yellow"	3
3	"Ray florets rose pink"	"Coreopsis rosea"
3	"Ray florets yellow"	4
4	"Ray florets fertile; leaves finely divided into narrowly linear segments"	"Coreopsis maritima"
4	"Ray florets sterile; leaves not divided into narrowly linear segments"	5
5	"Achenes with narrow, incurved, thickened wings"	"Coreopsis auriculata"
5	"Achenes with wide, spreading, membranous wings"	6
6	"Stems leafy at base, upper parts leafless and scape-like; leaves mostly simple"	"Coreopsis lanceolata"
6	"Stems leafy throughout; leaves mostly divided"	"Coreopsis grandiflora"