Stylidium alsinoides is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect annual plant that grows from 18 to 30 cm tall. Obovate or elliptical leaves, about 20–100 per plant, are scattered along the elongate, glabrous stems. The leaves are generally 5.5–14 mm (0.22–0.55 in) long and 3–8 mm (0.12–0.31 in) wide. The bracts on the inflorescence can be as large as leaves and may be hard to distinguish them except for their growth habit: the leaves are alternate whereas the bracts are opposite.
Stylidium cordifolium is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect annual plant that grows from 15 to 45 cm tall. Obovate or orbicular leaves, about 8-40 per plant, are scattered along the stems. The leaves are generally 3.5–8 mm long and about as wide. This species lacks a scape but has cymose inflorescences that are 4–13 cm long. Flowers are pink or red. S. cordifolium is found throughout tropical Australia, including northern Western Australia, in its typical habitat of swamp margins or moist sandy creekbanks. It flowers in the southern hemisphere from March to August. S. cordifolium is most closely related to S. javanicum, which has smaller leaves, sepals, capsules, and seeds. S. javanicum and S. cordifolium also differ in their distribution with S. javanicum's range not extending to Australia. Its conservation status has been assessed as data deficient.
Stylidium candelabrum is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect annual plant that grows from 6 to 20 cm tall. Elliptical leaves, about 11-100 per plant, are scattered along the stem. The leaves are generally 2.5–18 mm long and 1.5–9 mm wide. This species generally has 1-13 scapes and cymose inflorescences that are 3–16 cm long. Flowers are white. S. candelabrum is endemic to the northernmost area of the Northern Territory in Australia and much of its range is within a national park and therefore has been evaluated to be neither rare nor threatened. Its typical habitat is shallow sand associated with sandstone pavements and it appears to prefer areas with higher rainfall. It flowers in the southern hemisphere from March to July. Its conservation status has been assessed as secure.
Stylidium ensatum is a dicotyledonous plant that belongs to the genus Stylidium that was described as a new species by A.R. Bean in 2000, though the taxon had been noted by Rica Erickson in her discussion of S. muscicola variation in 1958. The specific epithet ensatum is from the Latin ensatus, meaning sword-like, which refers to the shape of the floral throat appendages of this species.
Stylidium lobuliflorum is a dicotyledonous plant, with a native range is concentrated in and around Kimberley in Western Australia and extends to the Northern Territory.
Stylidium pachyrrhizum is a dicotyledonous plant that belongs to the genus Stylidium that was described by Ferdinand von Mueller in 1859. It is an erect annual plant that grows from 15 to 40 cm tall. Obovate or oblanceolate leaves, about 5-30 per plant, are scattered along the stems. The leaves are generally 13–100 mm long and 3.5–24 mm wide. This species generally has one to six scapes and cymose inflorescences that are 13–33 cm long. Flowers are white or pink. S. pachyrrhizum's distribution ranges from western Kimberley in Western Australia and extends to Groote Eylandt off the east coast of the Northern Territory. Its typical habitats are swamp margins or seepage areas near sandy or rocky creeks. It flowers in the southern hemisphere from March to June. S. pachyrrhizum is most closely related to S. schizanthum and S. stenophyllum and some specimens are hard to differentiate between S. pachyrrhizum and S. schizanthum.
Stylidium schizanthum is a dicotyledonous plant that belongs to the genus Stylidium that was described by Ferdinand von Mueller in 1859. It is an erect annual plant that grows from 9 to 30 cm tall. Obovate, orbicular, or oblanceolate leaves, about 3-13 per plant, form basal rosettes. The leaves are generally 3.5–23 mm long and 1.5–12 mm wide. This species generally has one to four scapes and cymose inflorescences that are 9–30 cm long. Flowers are white, pink, mauve, or yellow. S. scizanthum's distribution ranges from the Kimberley region in Western Australia through the Northern Territory and into northern Queensland. It has been reported as far south as Mount Surprise and even in southern New Guinea. Its typical habitats are moist sand in Eucalyptus or Melaleuca communities, near creekbanks, or associated with sandstone landscapes. It flowers in the southern hemisphere from February to October. S. schizanthum is closely related to both S. pachyrrhizum and S. lobuliflorum.
Stylidium tenerum, the swamp triggerplant, is a dicotyledonous plant that belongs to the genus Stylidium that was described by Curt Polycarp Joachim Sprengel in 1826. Robert Brown had described this species in 1810 under the name S. tenellum, a name which had already been used for another species in 1805 by Olof Swartz. To add to the confusion, Rica Erickson had described and illustrated this taxon in 1958 under the name S. uliginosum, another currently accepted name for a related species.
Stylidium dunlopianum is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect perennial plant that grows from 15 to 50 cm tall. Obovate leaves, about 6-12 per plant, form a basal rosette with some scattered along the stem. The leaves are generally 20–60 mm long and 7–19 mm wide. This species generally has one to five scapes and cymose inflorescences that are 13–40 cm long. Flowers are pink or mauve. S. dunlopianum's distribution ranges from the Mitchell River area in Western Australia east to the Kakadu National Park in the Northern Territory. Its typical habitats include sandy or black organic soils along creekbanks, near rainforests, or in seepage areas in Melaleuca leucadendra swamps. It flowers in the southern hemisphere from May to November. S. dunlopianum is most closely related to S. rotundifolium, but differs most significantly by its thickened stem base and growth habit. S. dunlopianum is a perennial whereas S. rotundifolium is an annual. Its conservation status has been assessed as data deficient.
Stylidium rotundifolium is a dicotyledonous plant that belongs to the genus Stylidium. It is an erect annual plant that grows from 4 to 18 cm tall. Obovate or oblanceolate leaves, about 4-17 per plant, form a basal rosette around the compressed stem. The leaves are generally 5–29 mm long and 3–10 mm wide. This species generally has one to ten scapes and cymose inflorescences that are 4–18 cm long. Flowers are pink or white. S. rotundifolium's wide, sporadic distribution ranges from the Kimberley region in Western Australia east to northeastern Queensland with a significant population near Taroom, Queensland. Its typical habitats include damp sandy soils on creekbanks, receding waterholes, or Melaleuca woodlands. It flowers in the southern hemisphere from April to October. S. rotundifolium is most closely related to S. dunlopianum.
Stylidium capillare is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 6 to 13 cm tall. Obovate or orbicular leaves, about 4-7 per plant, form basal rosettes around the compressed stems. The leaves are generally 1.5–5 mm long and 1–3 mm wide. Petioles are absent. This species usually has one to two scapes per plant and 6–13 cm long inflorescences. Flowers are white and bloom from March to June in the southern hemisphere. S. capillare's distribution ranges from Litchfield National Park in the Northern Territory east to Cooktown Mareeba in northern Queensland, Australia. Its habitat is recorded as being sandy soils in eucalypt woodlands and swampy Melaleuca species communities. S. capillare is most closely related to S. nominatum. Its conservation status has been assessed as secure.
Stylidium confertum is a dicotyledonous plant that belongs to the genus Stylidium. The specific epithet confertum refers to this species' crowded cluster of leaves at the base of the stem. It is an annual plant that grows from 6 to 21 cm tall. Linear or deltate leaves, about 15–100 per plant, are scattered along the elongate, glabrous stem. The leaves are generally 1.5–4 mm long and 0.2–0.7 mm wide. Petioles and scapes are absent. Inflorescences are 3–13 cm long. Flowers are white and bloom from April to May. S. confertum is only known from a couple populations in the wet tropic of northern Queensland from Tully and Cooktown. Its habitat is recorded as being damp, rocky creekbanks or open rock faces that are dominated by mosses and other species such as Micraira subulifolia and grow at altitudes from 100 to 880 metres. S. confertum is most closely related to S. fissilobum but differs mostly in the amount of leaves present at the base of the stem and corolla shape and size. Its conservation status has been assessed as data deficient.
Stylidium diffusum is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 3 to 14 cm tall. Linear or deltate leaves, about 5-20 per plant, are scattered along the elongate, glabrous stem. The leaves are generally 2–8 mm long and 0.4-1.7 mm wide. Petioles and scapes are absent. Inflorescences are 1.5–8 cm long. Flowers are pink, white, or mauve and bloom from March to September in the southern hemisphere. S. diffusum's distribution is scattered along the east coast of Queensland and has populations recorded from Elcho Island and Groote Eylandt in the Northern Territory in Australia. It has been recorded as growing in Melaleuca viridiflora woodlands, soakage areas in eucalypt woodlands, on swamp edges, and on damp sandy creekbanks. S. diffusum is most closely related to S. tenellum. Its conservation status has been assessed as data deficient.
Stylidium fissilobum is a dicotyledonous plant that belongs to the genus Stylidium.
Stylidium longissimum is a dicotyledonous plant that belongs to the genus Stylidium. The specific epithet is from the Latin longissimus, which means "very long" and refers to this species' long capsules that can be up to 15 mm long excluding the sepals. The capsules may be the longest in the genus.
Stylidium oviflorum is a dicotyledonous plant that belongs to the genus Stylidium. The specific epithet oviflorum comes from the Latin ovi meaning egg and florus meaning flower, which refers to this species flower colouration that resembles a fried egg with bright yellow and pure white colours. It is an annual plant that grows from 6 to 26 cm tall. The linear or deltate leaves, about 3-11 per plant, are scattered along the stem and are generally 1.4–3 mm long and 0.25-0.6 mm wide. Petioles and scapes are absent. Inflorescences are 4–15 cm long and produce white and yellow flowers that bloom from April to August in the southern hemisphere. S. oviflorum is endemic to the northern area of Queensland from Mareeba and Wairuna west to Barwidgi. Its habitat is recorded as being sandy soils in seepage areas, on hillsides, or beside creeks in the company of Melaleuca viridiflora, Eucalyptus camaldulensis, or E. cullenii. S. oviflorum is most closely related to S. fissilobum but differs mostly in the corolla colour and self-supporting stems. Its conservation status has been assessed as data deficient.
Stylidium pedunculatum is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 5 to 10 cm tall. The linear or deltate leaves, about 20-200 per plant, are mostly in terminal rosettes but with some scattered along the elongate stem. The leaves are generally 4.5-8.5 mm long and 0.5-0.8 mm wide. Petioles are absent. This species produces 2-14 scapes per plant. Inflorescences are 4–7 cm long and produces a single white or pink flower that blooms from March to September in the southern hemisphere. S. pedunculatum's distribution is scattered in the tropical areas of Queensland and the Northern Territory and isolated in the Aru Islands. Its habitat is recorded as being damp, sandy soils in open Melaleuca viridiflora communities. It's been found in association with Drosera, Schoenus, and Utricularia species. S. pedunculatum is most closely associated with S. ericksoniae. Its conservation status has been assessed as data deficient.
Stylidium trichopodum is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 6 to 20 cm tall. The linear leaves, about 20-200 per plant, are scattered along the elongate, glabrous stems. The leaves are generally 3–9 mm long and 0.2-0.7 mm wide. Petioles are absent. This species produces 1-10 scapes per plant. Inflorescences are 2.6–6 cm long and produce a single yellow or orange flower that blooms in June and July in the southern hemisphere. S. trichopodum is endemic to northern Queensland and is only known from a few populations. Its habitat is recorded as being moist sandy soils on flat or gently sloping terrain, sometimes in areas dominated by Melaleuca species. S. trichopodum is most closely related to S. pedunculatum, though it differs by its much larger flower and its cauline leaves instead of terminal rosettes for S. pedunculatum.
Stylidium floribundum is a dicotyledonous plant that belongs to the genus Stylidium. S. floribundum's distribution ranges from the Kimberley region of Western Australia across northern Australia to northwestern Queensland.
Stylidium multiscapum is a dicotyledonous plant that belongs to the genus Stylidium. It is an herbaceous annual plant that grows from 10 to 20 cm tall. Oblanceolate leaves, about 8-100 per plant, form a basal rosette with stems absent.
