Stylidium is a genus of dicotyledonous plants that belong to the family Stylidiaceae. The genus name Stylidium is derived from the Greek στύλος or stylos, which refers to the distinctive reproductive structure that its flowers possess. Pollination is achieved through the use of the sensitive "trigger", which comprises the male and female reproductive organs fused into a floral column that snaps forward quickly in response to touch, harmlessly covering the insect in pollen. Most of the approximately 300 species are only found in Australia, making it the fifth largest genus in that country. Triggerplants are considered to be protocarnivorous or carnivorous because the glandular trichomes that cover the scape and flower can trap, kill, and digest small insects with protease enzymes produced by the plant. Recent research has raised questions as to the status of protocarnivory within Stylidium.
Stylidium graminifolium, the grass triggerplant, is a dicotyledonous plant that belongs to the genus Stylidium. This species used to belong to the Stylidium graminifolium complex, but the name was conserved for this single species when two others were split from the complex and introduced as new species in 2001. S. graminifolium is endemic to Australia and is one of the Stylidium species with the widest distribution throughout Australia. It is a perennial plant with grass-like leaves and is easily cultivated. It has been considered to be a carnivorous or protocarnivorous plant because it possesses glandular trichomes underneath the flowers that can trap and digest prey.
Stylidium fimbriatum is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect annual plant that grows from 15 to 30 cm tall. Oblanceolate leaves, about 16 per plant, form a basal rosette around the compressed stems. The leaves are generally 5–20 mm long and 2–7 mm wide. This species generally has one or two scapes and cymose inflorescences that are 15–30 cm long. Flowers are pink with yellow highlights. S. fimbriatum's distribution is confined to the area around Bachsten Creek in the Kimberley region in Western Australia. Its typical habitat is herbfields that are seasonally wet.
Stylidium prophyllum is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 8 to 30 cm tall. The deltate leaves, about 4-10 per plant, are scattered along the elongate, glabrous stem and are generally 0.7-1.5 mm long and 0.3-0.6 mm wide. Petioles and scapes are absent. Inflorescences are 3–14 cm long and produce pink flowers that bloom from February to June in the southern hemisphere. S. prophyllum is endemic to the area in and around the Kimberley region in Western Australia. Its habitat is recorded as being "grassy floodplains, seepage areas, and waterways." S. prophyllum is most closely related to S. fissilobum but differs mostly in its glabrous sepals.
Stylidium perizostera is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 5 to 11 cm tall. The linear leaves, about 8–12 per plant, are mostly in terminal rosettes but with some scattered along the elongate, glabrous stem. The leaves are around 7.5 mm long and 0.4-0.7 mm wide. Petioles are absent. This species produces 1-10 scapes per plant. Inflorescences are around 9 cm long and produce a single white, yellow, and orange flower. S. perizostera is endemic to the Kimberley region in Western Australia and ranges from the Mitchell Plateau to Bigge Island. Its habitat is recorded as being near sandstone outcrops in drainage lines.
Stylidium aceratum is a dicotyledonous plant that belongs to the genus Stylidium. It occurs within the south west region of Western Australia
Stylidium diceratum is a dicotyledonous plant that belongs to the genus Stylidium. The specific epithet diceratum is Greek for "two horns", referring to the two appendages that are present on the bend of the gynostemium. It is an annual plant that grows from 15 to 35 cm tall. The longer leaves are lanceolate and the shorter ones are spathulate, forming a basal rosettes around the stem. The leaves are around 5–8 mm long and 0.2-2.5 mm wide. Inflorescences are around 6–15 cm long and produce flowers that are orange with dark orange and pink veins and bloom from June to August in their native range. S. diceratum is only known from the type location, which is at creek crossings on the road to Beverley Springs in the Kimberley region of Western Australia. Its habitat is recorded as being sandy soils on creek margins. It grows in the presence of S. ceratophorum, S. rubriscapum, Drosera caduca, D. paradoxa, Byblis liniflora, and Grevillea pteridifolia. S. diceratum is most closely related to S. longicornu, but it can be confused with S. ceratophorum, which also has an orange corolla but twice as large.
Stylidium weeliwolli is a dicotyledonous plant that belongs to the genus Stylidium. It occurs in the North West of Western Australia
Stylidium inaequipetalum, the Ayers Rock triggerplant, is a small herbaceous perennial plant in the genus Stylidium. It grows from 7 to 40 cm tall. Oblanceolate leaves, about 20-100 per plant, form a basal rosette with stems absent. The leaves are generally 15–81 mm long and 2–8 mm wide. This species produces 1-11 scapes per plant. Inflorescences are 7–40 cm long and produce pink flowers with petals all free and blooms almost year-round in their native range. S. inaequipetalum is endemic to the southwestern Northern Territory and Western Australia. Its typical habitat has been reported as sandy soils on sheltered creekbanks or in between rocks. S. inaequipetalum is most closely related to S. floribundum, though it is also closely allied with S. debile.
Stylidium spathulatum is a dicotyledonous plant that belongs to the genus Stylidium. The species is informally named the creamy triggerplant for the colour of its flowers.
Stylidium affine is a species in the genus Stylidium that is endemic to Western Australia.
Drosera zigzagia is an erect perennial tuberous species in the carnivorous plant genus Drosera. It is endemic to Western Australia and is found on the margins of salt lakes in brown sandy loam, often associated with D. salina, Stylidium insensitivum, S. pulviniforme, Levenhookia leptantha, and Frankenia species. Drosera zigzagia produces small, solitary carnivorous leaves that alternate along a zigzag stem, which can be 5–7 cm (2.0–2.8 in) high. Yellow flowers are borne on 4–9-flowered inflorescences that bloom from August to September.
Stylidium soboliferum, commonly known as Grampians triggerplant or bristly triggerplant, is a species of flowering plant in the genus Stylidium. It is endemic to the Grampians region in Victoria, Australia. The leaves are about 1–2 centimetres (0.39–0.79 in) long and are arranged in a small rosette. The flowers, which appear on 5–15 centimetres (2.0–5.9 in) long stems, have white to pale pink petals with a darker colour on the reverse side. Plants occur along drainage lines and in moist areas amongst rocks.
Leptospermum rupestre, commonly known as alpine tea-tree or prostrate tea-tree, is a flowering shrub in the myrtle family, Myrtaceae. It is endemic to Tasmania. In alpine areas it assumes a prostrate habit while in subalpine areas it appears as a large shrub.
Stylidium nymphaeum is a climbing triggerplant found along the southern coast of Southwest Australia. The species uses the curved tips of its leaves to clamber over nearby plants, attaining a height between 1.4 and 2.5 metres. These leaves are long and slender, between 15 and 75 millimetres in length and 0.8 to 2 millimetres in width, are hairless, and have an entire margin. The scape is also hairless. The flowers are pink to purple, appearing from December or January to May.
Stylidium glaucum, the grey triggerplant, is a herbaceous plant found along the southern coast of Southwest Australia, West of Albany. The plant attains a height between 0.15 and 0.65 metres. The leaves are lanceolate in form, becoming pointed at the base, and moderately acute at the tip. These are between 20 and 70 millimetres in length and 2 to 9 millimetres in width, are hairless, and have an entire margin. The trivial name of the species, glaucum, refers to the greyish colour of the leaves. The scape is hairless, supporting a racemose arrangement of white or pink flowers that appear from January to May.
Stylidium divaricatum, known by the vernacular name daddy-long-legs, is a species in the genus Stylidium that is endemic to Western Australia.
Stylidium schoenoides is a species of dicotyledon plant of the Stylidium genus, from Stylidiaceae family, Asterales order, first described by Augustin Pyramus de Candolle in 1839. The plant is endemic to Western Australia.
Stylidium scariosum is a small plant species in the family Ericaceae. It is endemic to Western Australia.
