1	"Ovary functionally 1- or 2-locular in most or all flowers; ovules 1–10 in one loculus but often absent or few in the other loculus. Fruits indehiscent or dehiscent, when 1-locular with the style base off-centre."	2
1	"Ovary 3-locular in most flowers; ovules 3–23 per loculus. Fruits dehiscent by valves, with style base inset to the level of the placentas in a long central depression."	7
2	"Flowers 1.5–2.5 mm diam. Stamens 3–5, not in fascicles. Ovary functionally 1-locular, with 1 or rarely 2 ovules."	3
2	"Flowers 3.5–6.5 mm diam. Stamens usually more than 5, often in antisepalous fascicles. Ovary functionally 1- or 2-locular, usually with several ovules per loculus."	4
3	"Leaves mostly not in fascicles, always opposite, 2.5–5 mm long. Fruits with hypanthium somewhat compressed laterally; seed obliquely upright, ± broadly ovoid, off-white or golden brown. (Lake Jasper–Albany)"	"Astartea arbuscula"
3	"Leaves mostly in dense fascicles, sometimes in whorls of three, 2–2.5 mm long. Fruits broad; seed transverse, broadly reniform, with reddish markings. (Millbrook area)"	"Astartea transversa"
4	"Ovary functionally 1-locular, with several 1–6 ovules. Fruits (where known) indehiscent."	5
4	"Ovary functionally 2-locular, with 2–10 ovules per loculus. Fruits usually dehiscent."	6
5	"Petals deep pink. Stamen filaments 0.5–0.6 mm long. Style 0.6–0.8 mm long. (Denmark area)"	"Astartea arbuscula × corniculata"
5	"Petals white or pale pink. Stamen filaments 0.6–1.1 mm long. Style 1.2–1.5  mm long. (Brookton Hwy–Donnelly River–Scott River)"	"Astartea zephyra"
6	"Leaves mostly not in fascicles, 4–10 mm long. Outer sepals smooth to strongly ridged. (Brookton Hwy–Donnelly River–Scott River)"	"Astartea zephyra"
6	"Leaves mostly in fascicles, 2.5–4.5 mm long. Outer sepals with a prominent dorsal horn 0.4–1 mm long. (Walpole–E of Albany)"	"Astartea corniculata"
7	"Testa of mature seeds thick, shallowly reticulate-pitted or colliculate, the main surface usually uniformly dark red-brown and strongly contrasting with the white inner protrusion (but with chaff pieces often lacking the colour contrast) or with a red reticulate pattern rather than a uniform one. (Two species that key here are also distinctive in having young stems with crown-shaped outgrowths)."	8
7	"Testa of mature seeds thin, uniformly cream to medium brown or mottled with reddish markings, usually with a smooth reticulate pattern (i.e. cells level, not shallowly pitted or convex) but often slightly pitted in A. reticulata."	13
8	"Plants either with crown-shaped outgrowths on the young leaves or with smooth sepals. Seeds uniformly dark red or red-brown at maturity."	9
8	"Plants lacking crown-shaped outgrowths, the sepals strongly ridged or horned. Seeds partially dark red at maturity."	12
9	"Young stems fairly smooth. Stamens 40–53, in fascicles  opposite each sepal and usually also with a single stamen opposite all or some of the petals. Outer sepals not ridged. (Upper Jerdacuttaup River–Hopetoun–Darkanuttup)"	"Astartea cicatricosa"
9	"Young stems with crown-shaped outgrowths. Stamens 15–35, all or mostly in fascicles opposite each sepal and rarely any opposite petals. Outer sepals usually ridged."	10
10	"Petioles 0–0.5 mm long. Peduncles sometimes paired in the axils, much longer than the pedicels at all stages, up to 3-flowered. Ovules 10–16 per loculus. Occurring well inland. (Hotham and Avon Rivers–Dumbleyung area)"	"Astartea muricata"
10	"Petioles 0.5–0.8 mm long. Peduncles always solitary, much shorter than to longer than the pedicels in late flower, always 1-flowered. Ovules 6–12 (–14) per loculus. Occurring on or near the south coast."	11
11	"Young stems densely muricate. Leaf blades 2.5–5 (–8) mm long. Peduncles 1–2.5 mm long, often not much longer than or exceeded by the pedicels. (S of Stirling Range–Fitzgerald River NP)"	"Astartea aspera subsp. aspera"
11	"Young stems scarcely or not obviously muricate. Leaf blades 6–11 mm long. Peduncles 2.5–5 mm long, longer than the pedicels. (Phillips River area–Lort River)"	"Astartea aspera subsp. riparia"
12	"Petioles 1–1.5 mm long. Hypanthium rather strongly 10-ribbed. Occurring in gullies on quartzite. (Mt Barren Ranges)"	"Astartea decemcostata"
12	"Petioles 0.4–0.8 mm long. Hypanthium not ribbed or somewhat 5-ribbed. Occurring in Swamps or along creek lines. (Fitzgerald River NP–Esperance)"	"Astartea reticulata"
13	"Young stems prominently winged; wings distinctly expanded at the apex. Pedicels usually much longer than the peduncles. Occurring in very damp habitats, often in gullies. (Dwellingup –Augusta–Cape Riche)"	"Astartea pulchella"
13	"Young stems not winged to moderately winged; wings (when present) fairly uniformly expanded at the apex. Pedicels usually shorter than, or similar in length to, the peduncles. Occurring in varied habitats including granite outcrops, swamps and river banks."	14
14	"Hypanthium (of old buds and young flowers) deeply reticulate-pitted. Petals usually pale to medium pink."	15
14	"Hypanthium (of old buds and young flowers) smooth or somewhat rugose or with oil glands prominent but not very pitted. Petals usually white or pale pink."	17
15	"Shrubs with a lignotuber. Staminodes often present on margins of fascicles or opposite petals. Occurring mainly on or between mountain peaks. (Stirling Range area)"	"Astartea montana"
15	"Single-stemmed shrubs. Staminodes absent. Occurring on swamp margins."	16
16	"Peduncles 2–4 mm long. Stamens 5–11, with 0–3 per sepal, mostly not in fascicles. Occurring east of Hopetoun. (Esperance–Cape Arid NP)"	"Astartea astarteoides"
16	"Peduncles (2–) 4–11  mm long. Stamens usually 15–25 , with 1–6   per sepal, all or mostly in fascicles. Occurring West of Hopetoun. (Donnelly River–E of Albany)"	"Astartea glomerulosa"
17	"Plants restricted to granite outcrops or coastal granite. Flowers 8–15 mm diam. Stamens 5–13 per fascicle, flanked by 1 or 2 long staminodes in one species, the other two species with long-horned sepals."	18
17	"Plants associated with swamps, watercourses and runoff areas from rocks. Flowers 4–11 mm diam. Stamens 0–11 opposite each stamen, if sepals long-horned then some fascicles absent or with less than 5 stamens."	20
18	"Young stems with prominently thickened, pale grey stripes below each petiole and alternating with reddish brown stripes. Sepals prominently ridged, not horned. Stamen fascicles flanked by 1 or 2 long staminodes. Ovules 14–23 per loculus. Occurring on coastal granite. (Recherche Archipelago and adjacent coast)"	"Astartea fascicularis"
18	"Young stems with thinner, more irregular, pale grey stripes. Sepals long-horned. Stamen fascicles mostly without staminodes. Ovules 10–15 per loculus. Occurring in soil pockets on granite outcrops."	19
19	"Single-stemmed shrubs, killed by fire. Mature seeds produced copiously, uniformly coloured. (Granite outcrops N of Walpole)"	"Astartea granitica"
19	"Lignotuberous shrubs, resprouting after fire. Mature seeds apparently rarely produced, red-marked. (Granite outcrops N of Broke Inlet)"	"Astartea middletonii"
20	"Seeds developing reddish markings."	21
20	"Seeds uniformly off-white to golden brown."	22
21	"Peduncles 4–7 mm long. Flowers 8–11 mm diam.  (Broke Inlet–Denmark area)"	"Astartea schaueri"
21	"Peduncles 1.5–3.5 mm long. Flowers 4–6.5 mm diam. (Walpole–east of Albany)"	"Astartea corniculata"
22	"Tall shrubs or small trees to 5 m high, single-stemmed or with a row of stems through layering (usually with particularly slender leaves). Restricted to river banks subject to flooding. (Helena River–Hay River)"	"Astartea leptophylla"
22	"Small to tall shrubs 0.3–3 m high, lignotuberous or single-stemmed, not layering. Associated with swamps or other wetlands, not on major river banks."	23
23	"Shrubs single-stemmed or multi-branched at the base, not lignotuberous."	24
23	"Lignotuberous shrubs, resprouting by multiple close basal shoots."	25
24	"Outer sepals strongly ridged or with a short horn up to 0.4 mm long. Stamens 21–31, in antisepalous fascicles of 3–8. Ovules 8 –14 per loculus. (Cape le Grand NP–Cape Arid NP)"	"Astartea eobalta"
24	"Outer sepals with a very prominent horn 0.9–1.5  mm long. Stamens 5–18 , some (rarely all) in antisepalous fascicles of 2–5. Ovules 3–9 per loculus. (Scott River–D’Entrecasteaux NP)"	"Astartea onycis"
25	"Young stems usually with a delicate-looking, grey epidermis dotted with small dark glands, with leaves mostly in fascicles. Outer sepals smooth to strongly ridged, not horned. (Moore River–Albany)"	"Astartea scoparia"
25	"Young stems not as above, with leaves mostly not in fascicles. Outer sepals with a short to prominent subterminal dorsal horn 0.3–1 mm long. (Gingin–Augusta area)"	"Astartea affinis"