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Genus Stylidium Family Stylidiaceae

Description: Annual or perennial herbs or small shrubs.

Leaves basal, tufted or cauline, alternate or in tufts, margins toothed or entire.

Flowers in terminal racemes, corymbs or panicles. Sepals 5, ± united into 2 lips. Corolla tubular, deeply 5-lobed, the lobes imbricate in bud; lower lobe much smaller and usually reflexed. Column elongate and bent, sensitive with a trigger-like action when touched. Stamens 2; anthers at the summit of the column, one on either side of the undivided stigma. Ovary inferior, incompletely 2-locular; placentas axile or free central; seeds usually numerous.

Fruit a capsule, 2-valved; seeds usually numerous.


Distribution and occurrence: World: 136 species, South-East Asia, New Zealand & Australia. Australia: 110 species, all States, widespread, except drier areas, but mainly SW W.A.

Text by L. C. Stanberg
Taxon concept:

Taxa not yet included in identification key
Stylidium armeria,    Stylidium paniculatum

 Key to the species 
1Leaves in a basal rosette or in a single tuft at or near ground level, sometimes at the apex of a short stem and at the base of the scapes2
Leaves on elongated aerial stems7
2Leaves tufted3
Leaves in a rosette
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4
3Leaves linear, 5–25 cm long, usually 2–6 mm wide, the margins entire or finely toothed; scape usually 20–70 cm highStylidium graminifolium
Leaves very narrow-linear, 2–5 cm long, c. 1 mm wide, margins often incurved, and very finely toothed; scape usually less than 20 cm high
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Stylidium lineare
4Rosettes basal5
Rosette at the top of a short stem, often with scattered smaller leaves below
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6
5Flowers sessileStylidium tenerum
Flowers pedicellate
                       Back to 4
Stylidium brachyphyllum
6Leaves more than 6 cm longStylidium productum
Leaves less than 3 cm long
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Stylidium debile
7Leaves less than 15, thick and bract-like, usually scattered along stem, narrow-lanceolate and less than 4 mm longStylidium despectum
Leaves more than 15 and linear, either spirally arranged or in tufts
                       Back to 1
8
8Leaves spirally arranged, 1–4 cm long, c. 1 mm wideStylidium laricifolium
Leaves arranged in tufts, 2–20 cm long, 1–3 mm wide
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9
9Leaves 2–3 cm long, crowded in dense tufts at the end of branches below the flowering stemsStylidium eglandulosum
Leaves usually 8–20 cm long, scattered along the entire length of stem but crowded at intervals
                       Back to 8
Stylidium productum

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