Stylidium rotundifolium is a dicotyledon

Dicotyledon

The dicotyledons, also known as dicots, are a group of flowering plants whose seed typically has two embryonic leaves or cotyledons. There are around 199,350 species within this group...

ous plant

Plant

Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or...

 that belongs to the genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 Stylidium (family Stylidiaceae

Stylidiaceae

The family Stylidiaceae is a taxon of dicotyledonous flowering plants. It consists of five genera with over 240 species, most of which are endemic to Australia and New Zealand. Members of Stylidiaceae are typically grass-like herbs or small shrubs and can be perennials or annuals...

). It is an erect annual plant

Annual plant

An annual plant is a plant that usually germinates, flowers, and dies in a year or season. True annuals will only live longer than a year if they are prevented from setting seed...

 that grows from 4 to 18 cm tall. Obovate

Leaf shape

In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...

 or oblanceolate leaves, about 4-17 per plant, form a basal rosette

Rosette (botany)

In botany, a rosette is a circular arrangement of leaves, with all the leaves at a single height.Though rosettes usually sit near the soil, their structure is an example of a modified stem.-Function:...

 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

Scape (botany)

In botany, scapes are leafless flowering stems that rise from the ground. Scapes can have a single flower or many flowers, depending on the species....

 and cymose inflorescence

Inflorescence

An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

s that are 4–18 cm long. Flowers are pink or white. S. rotundifoliums wide, sporadic distribution ranges from the Kimberley region in Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

 east to northeastern Queensland

Queensland

Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...

 with a significant population near Taroom, Queensland

Taroom, Queensland

Taroom is a town on the Dawson River in Queensland. Australia in the Shire of Banana. The town is located on the Leichhardt Highway, north west of the state capital, Brisbane, from Rockhampton and from Toowoomba...

. Its typical habitats include damp sandy soils on creekbanks, receding waterholes, or Melaleuca

Melaleuca

Melaleuca is a genus of plants in the myrtle family Myrtaceae known for its natural soothing and cleansing properties. There are well over 200 recognised species, most of which are endemic to Australia...

 woodlands. It flowers in the southern hemisphere

Southern Hemisphere

The Southern Hemisphere is the part of Earth that lies south of the equator. The word hemisphere literally means 'half ball' or "half sphere"...

 from April to October. S. rotundifolium is most closely related to S. dunlopianum

Stylidium dunlopianum

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...

.

The synonym S. irriguum was described in 1918 and reduced to synonymy by A.R. Bean in 2000. Bean noted that the description of S. irriguum matched that of S. rotundifolium except for the flower color (pink with red highlights for S. rotundifolium and pale yellow to white for S. irriguum) and capsule

Capsule (fruit)

In botany a capsule is a type of simple, dry fruit produced by many species of flowering plants. A capsule is a structure composed of two or more carpels that in most cases is dehiscent, i.e. at maturity, it splits apart to release the seeds within. A few capsules are indehiscent, for example...

 size, which both fall within the natural variation for this species. S. reductum was also reduced to synonymy by Bean because the taxon described as S. reductum was just a juvenile form of S. rotundifolium that only had a single flower.

Its conservation status

Conservation status

The conservation status of a group of organisms indicates whether the group is still extant and how likely the group is to become extinct in the near future...

has been assessed as secure.