1	"Disc surface pubescent or papillose"	2
1	"Disc surface smooth"	3
2	"Disc surface and young stems stellate-hairy"	"Trymalium densiflorum"
2	"Disc surface densely papillose; young stems simple-pubescent"	"Trymalium angustifolium"
3	"Ovary roof and fruit (above the torus) glabrous"	4
3	"Ovary roof and fruit with stellate and/or simple hairs"	7
4	"Leaves less than 5 mm long, recurved-apiculate; plants often spinescent or intricately branched"	"Trymalium elachophyllum"
4	"Leaves 5 mm long or longer, apex ±straight; plants never spinescent or intricate"	5
5	"Shrub to 0.35 m high, totally glabrous; leaves distally toothed; fruit 1-celled, trigonous"	"Trymalium monospermum"
5	"Shrub taller than 0.4 m, pubescent with stellate and simple hairs; leaves entire; fruit 3-celled, not trigonous"	6
6	"Leaves ovate to broadly ovate, 5–12 mm long, flat or folded; fruit urceolate"	"Trymalium urceolare"
6	"Leaves narrowly obovate to linear, 6–45 mm long, flat to revolute; fruit terete"	"Trymalium ledifolium"
7	"Inflorescences few-flowered (up to 50 flowers); leaves usually less than 18 mm long; stipules and bracts persistent; plants often ±intricately branched"	8
7	"Inflorescences many-flowered (more than 50 flowers); leaves usually more than 18 mm long; stipules usually caducous (except in some specimens of Trymalium floribundum); bracts caducuous; plants never intricate"	10
8	"Leaves linear to narrowly obovate, revolute with only the broad midrib visible below; torus in middle third"	"Trymalium daphnifolium"
8	"Leaves obovate, folded or flat or slightly recurved, lamina visible below; torus in the upper third or apical"	9
9	"Leaves narrowly obovate to obovate, usually less than 4 mm wide, pubescent above (at least in young leaves); sepals and hypanthium tube densely pubescent; W.A."	"Trymalium myrtillus"
9	"Leaves broadly ovate to broadly obovate or fan-shaped, usually more than 5 mm wide, glabrous above; sepals sparsely pubescent, hypanthium tube densely so; S.A."	"Trymalium wayi"
10	"Young leaves quite glabrous adaxially, except sometimes along the midnerve"	11
10	"Young leaves, and often adult leaves as well, adaxially pubescent, at least on midrib and lateral veins"	12
11	"Leaves spathulate, lower surface with long antrorse simple hairs overlaying stellate hairs; shoots, inflorescences and flowers short-pubescent"	"Trymalium spatulatum"
11	"Leaves ovate, lower surface with patent stellate and simple hairs; shoots, inflorescences and flowers densely pilose"	"Trymalium venustum"
12	"Mature leaves closely grey-pubescent adaxially, ovate to elliptic; carpels 3"	"Trymalium litorale"
12	"Mature leaves glabrous or sparsely pubescent adaxially, ovate to broadly obovate; carpels 2–3"	"Trymalium floribundum"