1	"Ovary bilocular, symmetrical; fruit consisting of two mericarps, sometimes one aborted after flowering"	2
1	"Ovary unilocular, asymmetrical; fruit consisting of only one mericarp"	35
2	"Mericarps smooth, papillate, tuberculate or spiny, not hairy"	3
2	"One or both mericarps hairy"	27
3	"Lateral ribs of the fruit apically winged; wings obovate; dorsal rib with two rows of spines; the spines straight with a recurved to revolute tip, to 1.6 mm long 12"	"Trachymene ceratocarpa"
3	"Lateral ribs of the fruit not winged; dorsal rib without spines"	4
4	"Carpophores shortly 2- or 4-fid or 2-fid to base"	5
4	"Carpophores entire, tapering or 4-pronged at the apex"	13
5	"Involucral bracts 8 or fewer"	6
5	"Involucral bracts more than 8"	7
6	"Plants prostrate to ascending; leaf segments narrow, 0.5"	"Trachymene tenuifolia"
6	"Plants erect; leaf segments elliptic to ovate, 7"	"Trachymene umbratica"
7	"Leaves subtending the inflorescences similar to the leaves at the base of the plant"	8
7	"Trachymeneue leaves alternate and clustered at the base of the plant; the leaves subtending the inflorescence branches becoming reduced, sessile, tri-fid or simple, often opposite"	9
8	"Umbels 35"	"Trachymene cussonii"
8	"Umbels 15"	"Trachymene psammophila"
9	"Leaves divided into three segments; segments 8"	"Trachymene longipedunculata"
9	"Leaves ternately dissected, the segments again divided; segments under 6 mm wide"	10
10	"Peduncles with glandular trichomes at the base"	11
10	"Peduncles glabrous"	12
11	"Petals 0.7"	"Trachymene tenuifolia"
11	"Petals 1.2"	"Trachymene ochracea"
12	"Mericarps 2.4"	"Trachymene incisa"
12	"Mericarps 1.3"	"Trachymene tenuifolia"
13	"Leaves simple, clustered at the end of branches, bases cordate, margins serrate to lacinate; umbels borne in terminal dichasial cymes subtended by tri-fid to dissected bracts 17"	"Trachymene geraniifolia"
13	"Leaves ternately to palmately lobed, dissected or compound, or if simple, the base not cordate"	14
14	"Umbels 2"	15
14	"Umbels with more than 20 flowers"	18
15	"Carpophores 1.6"	16
15	"Carpophores 0.5"	17
16	"Involucral bracts 7"	"Trachymene pilosa"
16	"Involucral bracts 4"	"Trachymene cyanopetala"
17	"Small annual; trichomes glandular; fruit 0.8"	"Trachymene elachocarpa"
17	"Perennial; trichomes non-glandular; fruit 2.1"	"Trachymene procumbens"
18	"Leaves dissected; margins of the segments serrate"	19
18	"Leaves lobed to dissected; margins of the segments entire"	21
19	"Indumentum glandular; involucral bracts 20"	"Trachymene composita"
19	"Indumentum non-glandular; involucral bracts 12"	20
20	"Indumentum of simple trichomes 25"	"Trachymene didiscoides"
20	"Indumentum of branching trichomes 26"	"Trachymene dendrothrix"
21	"Leaves in basal rosettes only; fruit smooth or rugose; umbels borne singly"	22
21	"Leaves basal and / or cauline, not in rosettes at flowering; fruit smooth, papillate, tuberculate or rugose; umbels borne singly or in cymes"	23
22	"Leaves simple, elliptic to ovate, margins entire to palmately 5"	"Trachymene humilis"
22	"Leaves broad ovate, ternately to palmately lobed to dissected; flowers bisexual or female; fruit smooth 2"	"Trachymene scapigera"
23	"Western Australia 21"	"Trachymene anisocarpa"
23	"Eastern Australia"	24
24	"Fruit more than 4 mm long; fringed by two rows of triangular papillae on dorsal margin 16"	"Trachymene thysanocarpa"
24	"Fruit less than 3.6 mm long (rarely to 5.0 mm long); without triangular papillae on margin"	25
25	"Trachymeneichomes glandular 10"	"Trachymene ochracea"
25	"Trachymeneichomes non-glandular"	26
26	"Plants erect, taproot fleshy 3"	"Trachymene incisa"
26	"Plants procumbent or prostrate, taproot not fleshy 4"	"Trachymene procumbens"
27	"Leaves simple; flowers bisexual; petals white, villous; fruit with spongy triangular lateral protuberances obscured by indumentum; plants with a strong curry scent 18"	"Trachymene inflata"
27	"Leaves dissected; flowers male or bisexual; petals white, blue or pink, glabrous; fruit without spongy triangular lateral protuberances; plants without a strong curry scent"	28
28	"Umbels 2"	29
28	"Umbels with more than 20 flowers"	31
29	"Both mericarps totally obscured by dense felted branched trichomes; white or tinged purple; pedicels sparsely hirsute 14"	"Trachymene ornata"
29	"One or both mericarps sparse to densely villous with spreading trichomes or bristles, cream, brown or reddish-purple; pedicels glabrous"	30
30	"Involucral bracts 7"	"Trachymene pilosa"
30	"Involucral bracts 4"	"Trachymene cyanopetala"
31	"Plants with sparse non-glandular hairs; petals pink 19"	"Trachymene gilleniae"
31	"Plants glandular hairy; petals white, blue or purple"	32
32	"Pedicels villous 20"	"Trachymene coerulea"
32	"Pedicels glabrous"	33
33	"Leaf margins serrate; fruit 2.5"	"Trachymene composita"
33	"Leaf margins entire; fruit 1.4"	34
34	"Bracts at base of umbel glabrous or ciliate; flowers bisexual only; carpophores 0.8"	"Trachymene anisocarpa"
34	"Bracts at base of umbel hirsute; flowers bisexual or male; carpophores 1.0"	"Trachymene pyrophila"
35	"Bracts subtending inflorescence-bearing branches small, triangular or linear, entire; true leaves clustered at the base of the plant"	36
35	"Bracts subtending inflorescence-bearing branches similar to the leaves; usually becoming sessile and tri-lobed or tri-fid; not minute and triangular or linear; leaves basal or cauline"	40
36	"Trachymeneichomes on leaves stellate or dendritic"	37
36	"Trachymeneichomes on stem and leaves simple, glandular or absent"	38
37	"Stems glabrous; trichomes on leaves of one type 26"	"Trachymene dendrothrix"
37	"Stems villous; trichomes on stems and leaves of two types: short stellate and long dendritic with short side branches 27"	"Trachymene dusenii"
38	"Umbels with more than 70 flowers; large robust plants to 2.5 m high 25"	"Trachymene didiscoides"
38	"Umbels with up to 70 flowers; plants up to 1.0 m high"	39
39	"Leaves simple, orbicular to obovate or cuneate, with serrate and sometimes shallowly tri-lobed margins 28"	"Trachymene rotundifolia"
39	"Leaves ternately lobed to lacerate or dissected, margins serrate to lacinate 29"	"Trachymene microcephala"
40	"Leaves simple, broad ovate; margins serrate and shallowly 3-lobed; bracts subtending the inflorescence-bearing branches sessile, fan-shaped, serrate, becoming small and entire 30"	"Trachymene oleracea"
40	"Leaves ternately to palmately lobed or dissected; bracts not fan-shaped or serrate"	41
41	"Mericarps surrounded by a pair of narrow, pale, lobed wings, 0.3"	"Trachymene bialata"
41	"Wings singular and not completely surrounding the mericarp; or wings absent"	42
42	"Mericarps rugose, brown, with a white, translucent sheath covering the dorsal or dorsal and lateral ribs 34"	"Trachymene croniniana"
42	"Mericarps not rugose, brown or purple, not covered by a translucent sheath"	43
43	"Wing on mericarp 1"	44
43	"Wing less than 1 mm wide or absent"	45
44	"Plants sparsely glandular hairy to glabrous; umbels 40"	"Trachymene clivicola"
44	"Plants sparsely covered by 4"	"Trachymene villosa"
45	"Pedicels villous 20"	"Trachymene coerulea"
45	"Pedicels glabrous"	46
46	"Fruit papillate; the papillae dimorphic with 14"	"Trachymene cyanantha"
46	"Fruit without dimorphic papillae"	47
47	"Petals purple; wing on fruit 0.1"	"Trachymene glandulosa"
47	"Petals blue or white; if fruit winged then margin entire"	48
48	"Fruit 1.4"	49
48	"Fruit more than 2.5 mm long"	50
49	"Bracts at base of umbel glabrous or ciliate; flowers bisexual only; carpophores 0.8"	"Trachymene anisocarpa"
49	"Bracts at base of umbel hirsute; flowers bisexual or male; carpophores 1.0"	"Trachymene pyrophila"
50	"Leaf margins serrate 24"	"Trachymene composita"
50	"Leaf margins entire"	51
51	"Fruit less than 4.0 mm long"	52
51	"Fruit more than 4.0 mm long"	53
52	"Fruit papillate; Queensland 36"	"Trachymene bivestita"
52	"Fruit tuberculate or villous with barbed trichomes; Western Australia 22"	"Trachymene grandis"
53	"Involucral bracts lanceolate to elliptic; fruit with papillae terminated by glandular trichomes, often breaking off 32"	"Trachymene glaucifolia"
53	"Involucral bracts triangular to linear; fruit papillate or smooth"	54
54	"Petals 1.2"	"Trachymene bivestita"
54	"Petals 1.6"	"Trachymene pilbarensis"