1	"Rays (when obvious) usually yellow or white; achenes often terete to fusiform"	2
1	"Rays elongate and bluish to purplish or white, or rays reduced or lacking; achenes usually ±compressed"	4
2	"Involucral bracts thickened or keeled; style appendages of fertile disc flowers hairy"	"Grindelia: Grindelia camporum"
2	"Involucral bracts flattened, not keeled; style appendages of fertile disc flowers papillose, rarely hairy"	3
3	"Pappus 1-seriate; leaves subglabrous"	Solidago
3	"Pappus (1) 2 (3) -seriate; leaves often tomentose abaxially"	Olearia
4	"Involucral bracts with orange-resinous ribs or veins"	Erigeron
4	"Involucral bracts without prominent resinous veins"	5
5	"Ray florets, when present, (1–) 2–4-seriate (ray florets absent in Pilbara)"	6
5	"Ray florets 1-seriate"	19
6	"Pappus reduced or lacking, rarely a single series of bristles; ray florets with limbs short or lacking"	7
6	"Pappus of bristles in (1–) 2–3 series; limbs of ray florets sometimes elongate & coiling"	9
7	"Achenes often beaked; achene hairs not anchor-tipped; receptacles usually convex or flat"	Lagenophora
7	"Achenes not beaked; achene hairs often anchor-tipped; receptacles often conical or cyathiform"	8
8	"Perennial herbs; leaves pinnatisect"	Erodiophyllum
8	"Shrubs; leaves entire"	"Pilbara: Pilbara trudgenii"
9	"Achenes apical rounded or truncate, no beak or neck"	10
9	"Achenes with a short neck or long beak"	16
10	"Achenes usually with 2-many facial nerves between the 2 lateral nerves"	Vittadinia
10	"Achenes with only 2 lateral nerves"	11
11	"Achenes with a narrowed basal extension, densely tufted with stiff hairs"	Vittadinia
11	"Achenes without basal extension, hairs uniform"	12
12	"Disc floret ovaries fertile; pappus of ray & disc florets similar"	13
12	"Disc floret ovaries sterile; pappus of ray & disc florets different"	14
13	"Ray floret corollas yellow; disc corollas 4-lobed"	"Kippistia: Kippistia suaedifolia"
13	"Ray floret corollas white to bluish; disc corollas 5-lobed"	Vittadinia
14	"Disc floret corollas 5-lobed; pappus of ray achenes of bristles"	Minuria
14	"Disc floret corollas 3- or 4-lobed; pappus of ray achenes of scales or scales & bristles"	15
15	"Erect or decumbent herbs with solitary terminal heads; leaves cauline"	"Elachanthus: Elachanthus pusillus"
15	"Sessile herbs with heads clustered among bases of clustered rosette leaves"	"Isoetopsis: Isoetopsis graminifolia"
16	"Achenes with a long filiform beak"	Ixiochlamys
16	"Achenes with a short neck"	17
17	"Achenes with a narrowed basal extension, densely tufted with stiff hairs"	Vittadinia
17	"Achenes without basal extension, hairs uniform"	18
18	"Achenes c. 2 mm long; pappus bristles 2-seriate"	"Dichromochlamys: Dichromochlamys dentatifolia"
18	"Achenes c. 1 mm long; pappus bristles 1-seriate"	Iotasperma
19	"Achenes distally Y- or T-shaped with widely spreading arms; with wings involute on one side; pappus lacking"	"Ceratogyne: Ceratogyne obionoides"
19	"Achenes without distal arms or projections; pappus usually present"	20
20	"Disc florets mostly bisexual"	21
20	"Disc florets usually functionally staminate"	22
21	"Achene large flattened glabrous with multiple vascular strands in pericarp"	"Pembertonia: Pembertonia latisquamea"
21	"Achenes without the above combination of characters"	Brachyscome
22	"Pericarpic appendages absent; pappus absent"	"Hullsia: Hullsia argillicola"
22	"Pappus of pericarpic subulate to spreading appendages, often retrorsely barbed; true pappus sometimes of plumose bristles, or scales, or absent"	Calotis