WorldFloraDB - Stylidium

Characteristics

Small, annual or perennial herbs, often with glandular hairs. Leaves small, alternate, cauline or radical-rosulate (or verticillate), simple, entire, exstipulate. Inflorescences terminal. Flowers ☿, zygomorphic, usually cymose or racemose. Calyx gamosepalous; segments 5, the 2 anterior ones often adnate into a bifid lobe. Corolla generally conspicuous, sympetalous, irregular, 5-merous, often with a paracorolla formed by coronal or gland-like appendages in the throat; segments free or 2 or 4 of them connate, the fifth developed as a labellum usually smaller than the other segments. Stamens 2, lateral, the filaments entirely adnate to the style into an elongate, usually exserted and geniculate column, which is sensitive and mobile at its base; anthers extrorse, sessile just below the stigma, 2-celled. Ovary inferior, 2-celled or partly 1-celled by an imperfect septum; ovules usually numerous. Capsule dehiscent; seeds very small.

Herbs [rarely small shrubs or cushion plants], annual [or perennial], bearing glandular [and/or non-glandular] trichomes [seldom completely glabrous]. Leaves cauline or in a basal rosette [rarely whorled or imbricate]. Inflorescences lax spikes, cymes [racemes, panicles, pseudoheads, or corymbs], or with flowers solitary. Flowers perfect, zygomorphic. Calyx lobes 5, [distinct or] with 3 distinct and 2 connate [occasionally 2-labiate]. Corolla 5-merous, irregular; throat appendages (paracorolla) often present; lobes 5 but lowest (labellum) much smaller, usually reflexed, simple [or appendiculate]. Gynostemium usually exserted from corolla, bent and irritable [rarely erect and immobile]; anthers 2-locular; stigma entire [or 2-cleft]. Ovary incompletely 2-locular [or 1-locular due to reduction of septum]; ovules few to more often numerous.

Life form
Growth form	herb
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Environment

From sea-level up to 1100 m (or 1500 m: S. graminifolium Sw.), usually in uliginose, peaty, swampy, muddy or inundated and temporarily desiccated localities, near wells, along water-courses, and on rice-fields after the harvest, but also often on loamy or humous soils as well as on loose sand or on comparatively dry habitats, even on barren gravelly soil or on rocks; on flat open grass-lands as well as among open brushwood, sometimes in Eucalyptus-stands, in flat land or on hills. In Australia the main flowering season seems to be September to January.

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Cultivation

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