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 accedens is a dicotyledonous plant that belongs to the genus Stylidium. S. accedens is found around and northeast of Katherine in the Northern Territory of Australia.
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 divergens is a dicotyledonous plant that belongs to the genus Stylidium that was described as a new species in 2000. The specific epithet divergens means diverging or separating, referring to the widely spreading posterior petals. It is an erect annual plant that grows from 7 to 27 cm tall. Obovate, orbicular, or elliptical leaves, about 2-6 per plant, form a basal rosette. The leaves are generally 4–21 mm long and 3–5 mm wide. This species generally has one to six scapes and cymose inflorescences that are 4–24 cm long. Flowers are white or mauve. S. divergens is endemic to Kakadu National Park in the Northern Territory of Australia. Its typical habitats are sandstone slopes and gullies. It flowers in the southern hemisphere in April. S. divergens is most closely related to S. accedens. Its conservation status has been assessed as data deficient.
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 stenophyllum is a dicotyledonous plant that belongs to the genus Stylidium that was described by A.R. Bean in 2000. It is an erect annual plant that grows from 30 to 40 cm tall. Linear leaves, about 7-25 per plant, are scattered along the stems. The leaves are generally 36–86 mm long and 1.5-2.5 mm wide. This species generally has three to four scapes and cymose inflorescences that are 28–39 cm long. Flowers are white or pink. S. stenophyllum is endemic to the far northeastern Northern Territory of Australia and is only known from the type location. It has only been recorded from one sandstone monolith known as a beehive formation where less than 100 clumps of plants survive at the concentration of about 10 individual plants per clump. For this reason, A.R. Bean suggested a vulnerable conservation status. However it currently appears on neither the IUCN Red List nor the EPBC Act list of threatened flora.
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 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 fissilobum is a dicotyledonous plant that belongs to the genus Stylidium.
Stylidium nominatum is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 4 to 15 cm tall. The oblanceolate leaves, about 5-15 per plant, form basal rosettes around the stem and are 2.5–9 mm long, 0.5-1.5 mm wide. About 4-11 leaves per plant are also scattered along the stem and are generally 2.3-4.7 mm long and 0.3-0.5 mm wide. Scapes are absent. Inflorescences are 2–6 cm long and produce white flowers that bloom from April to June in the southern hemisphere. S. nominatum is endemic to the northern area of Kakadu National Park and Melville Island in the Northern Territory. Its habitat is recorded as being sandy soils in Melaleuca viridiflora woodlands, bases of sandstone escarpments, and gravelly yellow soil in flat, treeless areas. S. nominatum is most closely related to S. capillare. In his recent revision of the subgenus Andersonia, Anthony Bean (A.R.Bean) noted that there is a large variation recorded in the specimens of this species and more work would need to be done to determine if there's more than one taxon involved with this species. Further evaluation may reveal additional species.
Stylidium ericksoniae is a dicotyledonous plant that belongs to the genus Stylidium. It is an annual plant that grows from 6 to 15 cm tall. The linear or deltate leaves, about 20-100 per plant, are mostly in terminal rosettes but with some scattered along the elongate stem. The leaves are generally 4.0–9.5 mm (0.16–0.37 in) long and 0.6–1.1 mm (0.024–0.043 in) wide. Petioles are absent. This species produces 1–20 scapes per plant. Inflorescences are 5–11 cm (2.0–4.3 in) long and produces a single pink or mauve flower that blooms from March to August in the southern hemisphere. S. ericksoniae is endemic to the northern areas of the Northern Territory of Australia. Its habitat is recorded as being damp sand near sandstone rocks or on swampy drainage channels. It's been found in association with Micraira and Pandanus species. S. ericksoniae is most closely associated with S. pedunculatum. 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 leptorrhizum is a dicotyledonous plant that belongs to the genus Stylidium. It is an herbaceous annual plant that grows from 8 to 25 cm tall. Oblanceolate or elliptical leaves, about 10-20 per plant, form a basal rosette with stems absent. The leaves are generally 14–60 mm long and 3–9.5 mm wide. This species produces 1-3 scapes per plant. Inflorescences are 8–25 cm long and produce pink or mauve flowers that bloom from May to August in their native range. S. leptorrhizum is endemic to the Kimberley region of Western Australia and the Victoria River district of the Northern Territory. Its typical habitat has been reported as sandy soils along creeks or billabongs. S. leptorrhizum is most closely related to S. multiscapum. When reviewing section Debilia, Anthony Bean reduced the recently described S. barrettorum to synonymy with S. leptorrhizum after examining the type specimen.
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.
Stylidium ornatum is a dicotyledonous plant that belongs to the genus Stylidium. It is an herbaceous annual or perennial that grows from 10 to 30 cm tall. Oblanceolate leaves, about 5-25 per plant, form either a basal rosette with stems absent or in terminal rosettes when plant stems are present. The leaves are generally 13–37 mm long and 3–10 mm wide. This species produces 1-4 scapes per plant. Inflorescences are 12–30 cm long and produce pink flowers that bloom all year in their native range. S. ornatum is endemic to Queensland and New South Wales. Its typical habitat has been reported as sandy soils in heathland or "wallum" on waterlogged coastal sands. S. ornatum is closely related to S. debile. Its conservation status has been assessed as secure.
