1	"None of flowers of head with strap-shaped corollas that resemble spreading petals [ligulate flowers 0, ray flowers 0 or rays very short and easily overlooked]; heads discoid, disciform, or radiant"	2
1	"Some or all flowers of head with strap-shaped corollas or corolla lips [ligules or rays] that resemble spreading petals; heads liguliflorous, composed of 2-lipped flowers, or radiate"	8
2	"Flowers of 2 kinds, in same or different heads"	3
2	"Flowers of 1 kind [disk flowers] – heads discoid"	4
3	"Heads radiant; corollas of outer flowers [bisexual or sterile] conspicuously expanded, often ± bilateral"	"Asteraceae Group 1"
3	"Heads disciform [pistillate or sterile flowers and bisexual or staminate flowers] or unisexual, corollas of pistillate or sterile flowers inconspicuous or 0"	"Asteraceae Group 2"
4	"Receptacle bearing scale-like bracts [paleae] that generally individually subtend disk flowers or bearing hair-like bristles or tooth-like to membranous or bristle-like scales among flowers"	5
4	"Receptacle epaleate or paleae only marginal and simulating phyllaries (sometimes bearing minute scales or short hairs among flowers)"	6
5	"Receptacle paleate or bearing tooth-like to membranous scales"	"Asteraceae Group 3"
5	"Receptacle bristly or bearing long, bristle-like scales (free or fused at base)"	"Asteraceae Group 4"
6	"Pappus 0 or only a low crown"	"Asteraceae Group 5"
6	"Pappus well developed"	7
7	"Pappus of bristles (sometimes with an additional series of shorter bristles or scales)"	"Asteraceae Group 6"
7	"Pappus of flat, ± membranous scales or stiff, ± needle-like awns"	"Asteraceae Group 7"
8	"Head composed of 1 kind of flower; central flowers sometimes smaller or less mature but all bisexual and with same kind of corolla"	9
8	"Head radiate, composed of 2 kinds of flowers; outer flowers [ray flowers] pistillate or sterile, corolla bilateral with generally spreading, petal-like lip [ray]; inner flowers [disk flowers] bisexual (staminate) with generally radial, (4)5-lobed tubular corolla"	10
9	"Head liguliflorous; corolla 1-lipped, the spreading, petal-like ligule tipped by 5 short lobes [ligulate flowers]; corolla readily withering; sap milky"	"Asteraceae Group 8"
9	"Head composed of 2-lipped flowers; outer corolla lip shallowly 3-lobed, spreading, resembling ray of ray flower, inner lip deeply 2-lobed, recurved or coiled; corolla not readily withering; sap clear"	"Asteraceae Group 9"
10	"Receptacle bearing scale-like bracts [paleae] that generally individually subtend disk flowers (sometimes only a single ring of paleae separate ray and disk flowers)"	11
10	"Receptacle epaleate or bearing minute scales or hairs (rarely long bristles or awn-like projections) among flowers"	12
11	"Phyllaries in 1(2) series, each subtending a ray flower"	"Asteraceae Group 10"
11	"Phyllaries in 2+ series, not all subtending ray flowers"	"Asteraceae Group 11"
12	"Pappus 0 or only a low crown"	"Asteraceae Group 12"
12	"Pappus well developed on ray or disk fruits (or both)"	13
13	"Pappus of flat, ± membranous scales or stiff, ± needle-like awns"	"Asteraceae Group 13"
13	"Pappus of bristles (sometimes with an additional series of shorter bristles or scales)"	14
14	"Rays white to pink, blue, or purple"	"Asteraceae Group 14"
14	"Rays yellow to orange or red"	"Asteraceae Group 15"