1	"Young branchlets glabrous or with minute simple hairs"	2
1	"Young branchlets with stellate hairs"	13
2	"Flowers lacking petals (sepals only present)"	3
2	"Flowers with petals and sepals"	5
3	"Gynoecium 2-carpellate, with 2 stigmatic limbs, each 2- or rarely 3-lobed; fruit compressed-ellipsoid to compressed-obloid, with 2 medial longitudinal grooves"	"Ricinocarpos digynus"
3	"Gynoecium 3-carpellate, with 3 stigmatic limbs, each 2‒5-lobed; fruit globose to subglobose or broadly ovoid, with 3 longitudinal grooves"	4
4	"Leaves 6‒10(‒12) mm long, marginal glands absent, petiole usually appressed; male inflorescence umbelliform"	"Ricinocarpos stylosus"
4	"Leaves 15‒100 mm long, marginal glands often present, petiole not or rarely appressed; male inflorescence racemose"	"Ricinocarpos muricatus"
5	"Young branchlets minutely hairy in two longitudinal bands"	6
5	"Young branchlets glabrous"	8
6	"Ovaries and fruits hairy"	"Ricinocarpos pilifer"
6	"Ovaries and fruits glabrous"	7
7	"Abaxial surface of leaf blades with a sericeous indumentum; hairs ± straight"	"Ricinocarpos undulatus"
7	"Abaxial surface of leaf blades with a woolly indumentum; hairs crispate"	"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"	"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"	"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"	"Ricinocarpos graniticus"
11	"Fruits tuberculate, 14–16 mm long, 10–13 mm across"	"Ricinocarpos megalocarpus"
11	"Fruits smooth to tuberculate, 10–12 mm long, 5–8 mm across"	12
12	"Leaf blades 7–12 mm long, 1–1.7 mm wide, with a length/width ratio < 12:1"	"Ricinocarpos cyanescens"
12	"Leaf blades 10–25 mm long, 0.8–1.3 mm wide, with a length/width ratio ≥ 12:1"	"Ricinocarpos tuberculatus"
13	"Inflorescences terminal or axillary, of a single flower or umbelliform"	14
13	"Inflorescences terminal, racemose"	18
14	"Petals ≥ 3.5 mm long"	"Ricinocarpos brevis"
14	"Petals < 3.5 mm long"	15
15	"Leaf blades ≥ 8 mm wide, margins ± flat"	"Ricinocarpos marginatus"
15	"Leaf blades < 8 mm wide, margins recurved"	16
16	"Leaf blades < 20 mm long"	"Ricinocarpos brevis"
16	"Leaf blades ≥ 20 mm long"	17
17	"Adaxial surface of leaf blades moderately to densely stellate-pubescent; hairs with a short stout stipe"	"Ricinocarpos trichophyllus"
17	"Adaxial surface of leaf blades ± glabrous except for scattered sessile stellate hairs especially along the midline"	"Ricinocarpos rosmarinifolius"
18	"Young shoots and inflorescence with a greyish-white indumentum; adaxial surface of leaf blades with moderately dense indumentum of persistent stellate hairs; petals yellow"	"Ricinocarpos velutinus"
18	"Young shoots and inflorescence with a ferruginous indumentum; adaxial surface of leaf blades stellate-pubescent when young soon becoming glabrous; petals white"	"Ricinocarpos trichophorus"