1	"Young branchlets glabrous or with minute simple hairs"	2
1	"Young branchlets with stellate hairs"	15
2	"Flowers lacking petals (sepals only present)"	3
2	"Flowers with petals and sepals"	5
3	"Leaf blades < 15 mm long (W.A.)"	"Ricinocarpos stylosus"
3	"Leaf blades ≥ 15 mm long"	4
4	"Adaxial surface of calyx lobes glabrous (W.A.)"	"Ricinocarpos muricatus"
4	"Adaxial surface of calyx lobes pubescent (Qld)"	"Ricinocarpos verrucosus"
5	"Young branchlets minutely hairy in two longitudinal bands"	6
5	"Young branchlets glabrous"	8
6	"Ovaries and fruits hairy (W.A.)"	"Ricinocarpos pilifer"
6	"Ovaries and fruits glabrous"	7
7	"Abaxial surface of leaf blades with a sericeous indumentum; hairs ± straight (W.A.)"	"Ricinocarpos undulatus"
7	"Abaxial surface of leaf blades with a woolly indumentum; hairs crispate (W.A.)"	"Ricinocarpos glaucus"
8	"Young shoots and flower buds resinous; adaxial surface of calyx lobes glabrous"	9
8	"Young shoots and flower buds not resinous; adaxial surface of calyx lobes hairy"	11
9	"Leaf blades < 15 mm long (W.A.)"	"Ricinocarpos oliganthus"
9	"Leaf blades ≥ 15 mm long"	10
10	"Leaf blades linear to narrow-oblong or very narrow-obovate, (1.5–) 2.5–6 mm wide, with adaxial surface tuberculate and margins recurved but with most of the abaxial surface of the leaf blade visible (W.A.)"	"Ricinocarpos psilocladus"
10	"Leaf blades linear, ≤ 1.5 mm wide, with adaxial surface smooth and margins recurved to revolute so that only midrib of abaxial surface of the leaf blade is visible (W.A.)"	"Ricinocarpos graniticus"
11	"Fruits spiculate, densely covered with subulate processes"	12
11	"Fruits smooth or tuberculate"	13
12	"Fruits 14–16 mm long, 14–16 mm across; seeds ellipsoid, 9.5–10 mm long, 6–6.5 mm across; caruncles ruminate (Qld)"	"Ricinocarpos ruminatus"
12	"Fruits 8–12 mm long, 10–14 mm across; seeds ovoid, 5.5–9 mm long, 3.2–4.2 mm across; caruncles ± smooth (N.S.W., Qld, Tas., Vic.)"	"Ricinocarpos pinifolius"
13	"Fruits tuberculate, 14–16 mm long, 10–13 mm across (W.A.)"	"Ricinocarpos megalocarpus"
13	"Fruits smooth to tuberculate, 10–12 mm long, 5–8 mm across"	14
14	"Leaf blades 7–12 mm long, 1–1.7 mm wide, with a length/width ratio < 12:1 (W.A.)"	"Ricinocarpos cyanescens"
14	"Leaf blades 10–25 mm long, 0.8–1.3 mm wide, with a length/width ratio ≥ 12:1 (W.A.)"	"Ricinocarpos tuberculatus"
15	"Inflorescences terminal, racemose"	16
15	"Inflorescences terminal or axillary, of a single flower or umbelliform"	17
16	"Young shoots and inflorescence with a ferruginous indumentum; adaxial surface of leaf blades stellate-pubescent when young soon becoming glabrous; petals white (W.A.)"	"Ricinocarpos trichophorus"
16	"Young shoots and inflorescence with a greyish-white indumentum; adaxial surface of leaf blades with moderately dense indumentum of persistent stellate hairs; petals yellow (W.A.)"	"Ricinocarpos velutinus"
17	"Petals < 3.5 mm long"	18
17	"Petals ≥ 3.5 mm long"	21
18	"Leaf blades ≥ 8 mm wide, margins ± flat (W.A.)"	"Ricinocarpos marginatus"
18	"Leaf blades < 8 mm wide, margins recurved"	19
19	"Leaf blades < 20 mm long (W.A.)"	"Ricinocarpos brevis"
19	"Leaf blades ≥ 20 mm long"	20
20	"Adaxial surface of leaf blades moderately to densely stellate-pubescent; hairs with a short stout stipe (N.T., W.A.)"	"Ricinocarpos trichophyllus"
20	"Adaxial surface of leaf blades ± glabrous except for scattered sessile stellate hairs especially along the midline (W.A.)"	"Ricinocarpos rosmarinifolius"
21	"Petals < 6 mm long"	22
21	"Petals ≥ 6 mm long"	25
22	"Margins of leaf blades recurved with most of the abaxial surface of the leaf blade visible (Qld)"	"Ricinocarpos ledifolius"
22	"Margins of leaf blades recurved to revolute so that only the midrib of the abaxial surface of the leaf blade is visible"	23
23	"Fruits < 7 mm long (Qld)"	"Ricinocarpos crispatus"
23	"Fruits ≥ 7 mm long"	24
24	"Abaxial surface of leaf blades with a pubescent indumentum (W.A.)"	"Ricinocarpos brevis"
24	"Abaxial surface of leaf blades with a sericeous indumentum (N.S.W., Qld)"	"Ricinocarpos linearifolius"
25	"Adaxial surface of leaf blades hairy becoming glabrous and scabrid by the persistent tuberculate bases of deciduous hairs"	26
25	"Adaxial surface of leaf blades stellate-pubescent when young becoming glabrous and smooth"	27
26	"Abaxial surface of leaf blades pubescent with stellate hairs up to 0.4 mm across (N.S.W.)"	"Ricinocarpos bowmanii"
26	"Abaxial surface of leaf blades sericeous with stellate hairs up to 2 mm across (N.S.W., Qld)"	"Ricinocarpos trachyphyllus"
27	"Leaf blades ≥ 7 mm wide (N.S.W., Qld)"	"Ricinocarpos speciosus"
27	"Leaf blades < 7 mm wide"	28
28	"Margins of leaf blades recurved with most of the abaxial surface of the leaf blade visible (Qld)"	"Ricinocarpos caniana"
28	"Margins of leaf blades recurved to revolute so that only the midrib on the abaxial surface of the leaf blade is visible"	29
29	"Abaxial surface of leaf blades with a sericeous indumentum; petioles < 2 mm long (N.S.W., Qld)"	"Ricinocarpos linearifolius"
29	"Abaxial surface of leaf blades with a tomentose indumentum; petioles 2–3 mm long (N.T.)"	"Ricinocarpos gloria-medii"