Description: Annual, biennial, perennial or ephemeral herbs with slender taproot or stouter rootstock; stems erect glabrous or sparsely hairy, sometimes ± striate.
Leaves basal or cauline, simple or ternately dissected, petiolate, exstipulate. Inflorescence a terminal or leaf-opposed simple umbel; bracts in a single whorl, shortly united at the base.
Flowers bisexual or unisexual, white, pink, purple or blue. Sepals minute or absent. Petals elliptic to orbicular, midrib flat or keeled. Ovaries unilocular or 2-locular.
Fruit orbicular or semicircular; consisting of one or two mericarps, sometimes one not developed to maturity; laterally flattened; with abaxial wing or wingless, smooth, papilose, tuberculate or hairy. Carpophores entire to 2-fid to their base.
Distribution and occurrence: World: 55 spp., Aust., Malesia, N.Cal., Fiji. Aust: 38 spp. (37 spp. endemic), all states.
Text by J.M. Hart
Taxon concept: J.M. Hart, 2002
Taxa not yet included in identification key
| ||Key to the species|| |
|1||Leaves entire or shallowly and often asymmetrically 3-lobed||Trachymene humilis|
|Leaves deeply 3–5-lobed or 3-partite||2|
|2||Umbels with less than 10 flowers; mericarps hairy||3|
|Umbels with more than 10 flowers; mericarps smooth or patterned or rarely pilose|
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|3||Peduncles less than 20 mm long; pedicels in fruit 1–2 mm long; mericarps with flat soft ciliate hairs||Trachymene cyanopetala|
|Peduncles more than 20 mm long; pedicels in fruit 3–4 mm long; mericarps with fine woolly hairs|
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|4||Plant glaucous; mericarps 5–7 mm long, the surface granular-papillose||Trachymene glaucifolia|
|Plant not glaucous; mericarps up to 3.5 mm long, the surface smooth or otherwise patterned, not granular-papillose|
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|5||Mericarps wrinkled or corky-papillose or wrinkled-papillose||6|
|Mericarps smooth, wrinkled or muricate, rarely pilose|
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|6||Leaves 3–5-partite, the segments acute; bracts entire; peduncles glabrous||Trachymene incisa|
|Leaves deeply 3–5-lobed, the segments obtuse; bracts prominently ciliate; peduncles with glandular hairs at base|
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|7||Plant more than 1.2 m high; leaves to 9 cm long and 13 cm wide; petiole robust, hairy; umbels to 4 cm diam||Trachymene composita|
|Plants less than 1 m high; leaves to 4 cm long and 6 cm wide; petiole slender, glabrous or sparsely hairy; umbels up to 2 cm diam|
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|8||Procumbent or ascending herb with weak stems; bracts 2.5–3 mm long; mericarps usually muricate with many small papillae, sometimes smooth||Trachymene procumbens|
|Erect herbs with stiff stems; bracts 4–7 mm long; mericarps smooth|
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|9||Both mericarps maturing, glossy; pedicels in fruit 6–10 mm long||Trachymene scapigera|
|Often only 1 mericarp maturing, dull; pedicels in fruit 3–4.5 mm long|
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