Hibbertia circularis

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Hibbertia circularis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Dilleniales
Family: Dilleniaceae
Genus: Hibbertia
Species:
H. circularis
Binomial name
Hibbertia circularis

Hibbertia circularis is a species of flowering plant in the family Dilleniaceae and is endemic to the northern part of the Northern Territory. It is a perennial herb with prostrate, trailing branches, elliptic to more or less round leaves, and yellow flowers arranged in leaf axils, with thirty stamens arranged in groups around the two carpels.

Contents

Description

Hibbertia circularis is a perennial herb with prostrate, trailing branches up to 40 cm (16 in) long and sparsely hairy. The leaves are elliptic to more or less round, 15–25 mm (0.59–0.98 in) long and 15–21 mm (0.59–0.83 in) wide on a petiole 0.8–1.5 mm (0.031–0.059 in) long. The flowers are arranged singly or in pairs, in leaf axils on a thread-like peduncle 10–15 mm (0.39–0.59 in) long, with egg-shaped bracts 1.1–1.6 mm (0.043–0.063 in) long. The five sepals are joined at the base, the two outer sepal lobes 2.2–2.5 mm (0.087–0.098 in) long and the inner lobes 3–3.3 mm (0.12–0.13 in) long. The five petals are egg-shaped with the narrower end towards the base, yellow, 3.8–5.6 mm (0.15–0.22 in) long with a deep notch at the tip. There are thirty stamens and three or four staminodes arranged in groups around the two carpels, each carpel with two ovules. Flowering has been observed in February and March. [2] [3]

Taxonomy

Hibbertia circularis was first formally described in 2010 by Hellmut R. Toelken in the Journal of the Adelaide Botanic Gardens from specimens collected by Ian Cowie near Mount Howship in 2000. [2] [4] The specific epithet (circularis) refers to the almost round leaves. [2]

Distribution and habitat

This hibbertia grows in sand between rocks in woodland in western Arnhem Land escarpment in the Northern Territory. [2]

Conservation status

Goodenia circularis is only known from three collections and is classified as "data deficient" under the Northern Territory Government Territory Parks and Wildlife Conservation Act 1976. [3]

See also

Related Research Articles

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Hibbertia argyrochiton is a species of flowering plant in the family Dilleniaceae and is endemic to northern parts of the Northern Territory. It is a shrub densely covered with scales and has elliptic to lance-shaped leaves, and yellow flowers usually arranged singly in leaf axils, with twenty to twenty-four stamens arranged in groups around the two carpels.

Hibbertia auriculiflora is a species of flowering plant in the family Dilleniaceae and is endemic to northern parts of the Northern Territory. It is usually a short-lived perennial shrublet covered with hairs and scales and has mostly oblong to linear leaves. The flowers are usually arranged singly or in groups of two or three in leaf axils, with twenty-five to thirty-two stamens arranged in groups around the two carpels.

Hibbertia axillaris is a species of flowering plant in the family Dilleniaceae and is endemic to northern Western Australia. It is usually a multi-stemmed shrublet with ridged branchlets, foliage covered with scales and rosette-like hairs and mostly elliptic to lance-shaped leaves. The flowers are arranged singly in leaf axils, with forty-two to fifty stamens arranged around the three carpels.

Hibbertia bicarpellata is a species of flowering plant in the family Dilleniaceae and is endemic to northern Queensland. It is a shrub with hairy, ridged branches, elliptic leaves and yellow flowers arranged singly in leaf axils, with twenty to twenty-six stamens arranged in groups around the two carpels.

Hibbertia brennanii is a species of flowering plant in the family Dilleniaceae and is endemic to the Arnhem Land escarpment. It is a low, spreading sub-shrub with hairy foliage, elliptic to lance-shaped leaves and pale yellow flowers arranged singly in leaf axils, with ten to twelve stamens arranged in groups around the two carpels.

Hibbertia cactifolia is a species of flowering plant in the family Dilleniaceae and is endemic to the Arnhem Land escarpment. It is a multi-stemmed shrublet with hairy foliage, oblong to elliptic leaves and yellow flowers arranged singly in leaf axils, with twenty-six to twenty-eight stamens arranged in groups around the two carpels.

Hibbertia caudice is a species of flowering plant in the family Dilleniaceae and is endemic to northern Australia. It is a shrub with wiry stems, hairy foliage, elliptic to lance-shaped leaves with the narrower end towards the base, and yellow flowers arranged in leaf axils, mostly with twenty-four to twenty-six stamens arranged in groups around the two carpels.

Hibbertia ciliolata is a species of flowering plant in the family Dilleniaceae and is endemic to the northern part of the Northern Territory. It is a shrub with a single stem, hairy foliage, linear to elliptic leaves, and yellow flowers arranged in leaf axils, mostly with eighteen to twenty-six stamens arranged in groups around the two carpels.

Hibbertia cistifolia is a species of flowering plant in the family Dilleniaceae and is endemic to northern Australia. It is a prostrate to low-lying sub-shrub with trailing, wiry stems, hairy foliage, oblong to elliptic leaves and yellow flowers arranged in leaf axils, with forty to fifty-eight stamens arranged around the two carpels.

Hibbertia extrorsa is a species of flowering plant in the family Dilleniaceae and is endemic to a restricted part of the Northern Territory. It is a small, spreading shrub with hairy foliage, linear to elliptic leaves, and yellow flowers arranged in leaf axils with about thirty stamens arranged in groups around the two carpels.

Hibbertia guttata is a species of flowering plant in the family Dilleniaceae and is endemic to the Northern Territory. It is a straggly shrub with moderately to densely hairy foliage, linear to elliptic leaves, and yellow flowers arranged in leaf axils with 28 to 36 stamens arranged in groups around the three carpels.

Hibbertia incompta is a species of flowering plant in the family Dilleniaceae and is endemic to the Northern Territory. It is a weakly stemmed, often prostrate shrublet with hairy foliage, linear to elliptic leaves, and yellow flowers arranged in leaf axils with 45 to 60 stamens arranged in groups around the two or three carpels.

Hibbertia incurvata is a species of flowering plant in the family Dilleniaceae and is endemic to the Northern Territory. It is a spreading, woody shrub with scaly foliage, elliptic to lance-shaped leaves, and yellow flowers arranged in leaf axils with 28 to 35 stamens arranged in bundles around the two carpels.

Hibbertia malleolacea is a species of flowering plant in the family Dilleniaceae and is endemic to the northern parts of the Northern Territory. It is a straggly shrub with hairy foliage, elliptic leaves, and yellow flowers arranged in leaf axils with 28 to 32 stamens arranged in bundles around three carpels.

Hibbertia pancerea is a species of flowering plant in the family Dilleniaceae and is endemic to Kakadu National Park. It is a spreading shrub foliage densely covered with shield-like scales, that has elliptic leaves and yellow flowers arranged singly in leaf axils with 26 to 30 stamens arranged in bundles around two carpels.

Hibbertia persquamata is a species of flowering plant in the family Dilleniaceae and is endemic to the Northern Kimberley region of Western Australia. It is a spreading to prostrate shrub with flattened, scaly branches, narrow elliptic leaves and yellow flowers arranged singly in leaf axils with 20 to 26 stamens arranged around three scaly carpels.

Hibbertia pilulis is a species of flowering plant in the family Dilleniaceae and is endemic to Arnhem Land in the Northern Territory. It is a straggly shrub with hairy foliage, elliptic leaves and yellow flowers arranged singly in leaf axils with 34 to 46 stamens arranged in bundles around two carpels.

Hibbertia solanifolia is a species of flowering plant in the family Dilleniaceae and is endemic to the Top End of the Northern Territory in Australia. It is a spreading to low-lying shrub with ridged branches, elliptic leaves and yellow flowers usually arranged singly in leaf axils, with 34 to 38 stamens arranged in groups around three densely scaly carpels.

Hibbertia tricornis is a species of flowering plant in the family Dilleniaceae and is only known from a three specimens collected in Arnhem Land in the Northern Territory. It is a small, more or less prostrate shrublet with a few delicate, wiry branches, elliptic leaves and yellow flowers arranged singly in leaf axils with 19 to 24 stamens arranged in groups around two densely scaly carpels.

References

  1. ↑ "Hibbertia circularis". Australian Plant Census. Retrieved 20 April 2021.
  2. 1 2 3 4 Toelken, Hellmut R. (2010). "Notes on Hibbertia (Dilleniaceae) 5. H. melhanioides and H. tomentosa groups from tropical Australia" (PDF). Journal of the Adelaide Botanic Gardens. 23: 61–62. Retrieved 26 April 2021.
  3. 1 2 "Hibbertia circularis". efloraNT. Retrieved 26 April 2021.
  4. ↑ "Hibbertia circularis". APNI. Retrieved 26 April 2021.
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