Swainsona rostrata

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Swainsona rostrata
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Genus: Swainsona
Species:
S. rostrata
Binomial name
Swainsona rostrata

Swainsona rostrata is a species of flowering plant in the family Fabaceae and is endemic to Central Australia. It is a prostrate or low-growing annual or perennial plant with imparipinnate leaves with 7 to 9 egg-shaped leaflets with the narrower end towards the base, and racemes of usually up to 5 purple or cream-coloured flowers.

Contents

Description

Swainsona rostrata is prostrate or low-growing annual or perennial plant that typically grows to a height of up to about 10 cm (3.9 in). Its leaves are imparipinnate, mostly 10–40 mm (0.39–1.57 in) long on a variably-sized petiole, with 7 to 9 egg-shaped leaflets with the narrower end towards the base, the side leaflets mostly 3–10 mm (0.12–0.39 in) long and 2–6 mm (0.079–0.236 in) wide. There is a stipule 1.5–4 mm (0.059–0.157 in) long at the base of the petiole. The flowers are arranged in racemes 30–120 mm (1.2–4.7 in) long with up to 5 flowers on a peduncle up to 1 mm (0.039 in) wide, each flower about 8 mm (0.31 in) long on a pedicel about 2 mm (0.079 in) long. The sepals are joined at the base, forming a tube about 1.5 mm (0.059 in) long, the sepal lobes usually twice, to three times as long as the tube. The petals are purple and/or cream-coloured, the standard petal 8–10 mm (0.31–0.39 in) long and 9–12 mm (0.35–0.47 in) wide, the wings about 5–7 mm (0.20–0.28 in) long, and the keel about 8–9 mm (0.31–0.35 in) long and 3–4 mm (0.12–0.16 in) deep. The fruit is 15–20 mm (0.59–0.79 in) long and 3–5 mm (0.12–0.20 in) wide. [2]

Taxonomy and naming

Swainsona rostrata was first formally described in 1993 by Joy Thompson in the journal Telopea from specimens collected on the Burt Plain by Desmond Nelson in 1962. [2] [3] The specific epithet (rostrata) means "beaked", [4] referring to the shape of the keel. [2]

Distribution and habitat

This species of pea grows in heavy red soil on stony plains, mainly in the south of the Northern Territory, with some occurrences in adjacent areas of South Australia. [2] [5]

Related Research Articles

<i>Swainsona behriana</i> Species of plant

Swainsona behriana, commonly known as Behr's swainsona, is a species of flowering plant in the family Fabaceae and is endemic to south-eastern continental Australia. It is a prostrate or low-growing perennial herb with imparipinnate leaves usually with 9 to 13 narrowly elliptic to egg-shaped leaflets with the narrower end towards the base, and racemes of 2 to 7 purple flowers.

Swainsona acuticarinata is a species of flowering plant in the family Fabaceae and is endemic to arid areas of central Australia. It is a prostrate perennial herb with imparipinnate leaves with 5 to 11 leaflets, and racemes of purple flowers.

<i>Swainsona campestris</i> Species of legume

Swainsona campestris is a species of flowering plant in the family Fabaceae and is endemic to arid areas of southern Australia. It is an erect perennial herb with imparipinnate leaves with 9 to 11 linear to narrowly lance-shaped leaflets, and racemes of pink or purple flowers in racemes of 5 to 10.

Swainsona cyclocarpa is a species of flowering plant in the family Fabaceae and is endemic to northern inland areas of Australia. It is a prostrate or low-growing annual with imparipinnate leaves usually with up to 7 usually egg-shaped leaflets with the narrower end towards the base, and racemes of 4 to 16 purple flowers.

Swainsona disjuncta is a species of flowering plant in the family Fabaceae and is endemic to widely separated areas of central Australia. It is a prostrate perennial herb with imparipinnate leaves with 3 to 9 egg-shaped leaflets, and racemes of purple, pink or red flowers in racemes of 3 to 15.

<i>Swainsona elegans</i> Species of legume

Swainsona elegans is a species of flowering plant in the family Fabaceae and is endemic to Western Australia. It is a prostrate or ascending annual with imparipinnate leaves, usually with 7 to 15 egg-shaped or elliptic leaflets, and racemes of up to 15 blue or reddish-purple flowers.

Swainsona eremaea is a species of flowering plant in the family Fabaceae and is endemic to South Australia. It is a low-growing, spreading, probably perennial plant with imparipinnate leaves with 5 to 11 linear, oblong to broadly wedge-shaped leaflets, and racemes of bright red to brown or yellow flowers in racemes of 5 to 20.

Swainsona fuscoviridis is a species of flowering plant in the family Fabaceae and is endemic to South Australia. It is a perennial plant with many stems and imparipinnate leaves with mostly 7 or 9 ellipitic, linear or egg-shaped or lance-shaped leaflets, and racemes of 12 to 20 purple flowers.

Swainsona halophila is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia. It is usually a prostrate annual herb with imparipinnate leaves with 9 to 13 egg-shaped to broadly wedge-shaped leaflets, and racemes of 2 to 9 purple flowers.

Swainsona kingii is a species of flowering plant in the family Fabaceae and is native to Western Australia and South Australia. It is a prostrate or ascending annual or perennial herb, with imparipinnate leaves with usually 5 egg-shaped leaflets with the narrower end towards the base, and racemes of 1 to 3 pink to purple flowers.

<i>Swainsona laciniata</i> Species of legume

Swainsona laciniata is a species of flowering plant in the family Fabaceae and is endemic to north-western Australia. It is a prostrate or ascending perennial herb with imparipinnate leaves with 7 to 13 broadly elliptic to broadly egg-shaped leaflets, and racemes of 3 to 8 purple flowers.

Swainsona longicarinata is a prostrate or ascending perennial herb in the pea family and is endemic to the far west of Western Australia. It has 5 to 11 variably-shaped leaflets, and racemes of about 7, usually purple flowers.

Swainsona luteola, commonly known as dwarf Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to the eastern Australia. It is a prostrate or low-lying to semi-erect perennial with imparipinnate leaves with usually 3 to 17 narrowly elliptic leaflets, and racemes of 5 to 15 purple, sometimes yellow flowers.

Swainsona microcalyx, commonly known as wild violet, is a species of flowering plant in the family Fabaceae and is endemic to southern mainland Australia. It is a prostrate or low-growing perennial herb, with imparipinnate leaves with 5 to 9 broadly egg-shaped to wedge-shaped leaflets and racemes of 5 to 15 purple flowers.

Swainsona minutiflora is a species of flowering plant in the family Fabaceae and is endemic to South Australia. It is a prostrate, herbaceous plant with imparipinnate leaves with 5 to 9 oblong or narrowly oblong leaflets with the narrower end towards the base, and racemes of 3 to 7 yellow or pinkish flowers.

Swainsona pedunculata is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia. It is a small, ascending annual herb with imparipinnate leaves with 3 to 7 narrowly elliptic or lance-shaped leaflets, and racemes of 2 to 3 purple flowers.

Swainsona pyrophila, commonly known as yellow Swainson-pea or yellow Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to southern continental Australia. It is an erect or spreading annual or short-lived perennial plant with imparipinnate leaves with 15 to 19, mostly egg-shaped leaflets with the narrower end towards the base, and racemes of 15 to about 20 yellow flowers.

Swainsona rostellata is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia. It is a prostrate perennial herb with imparipinnate leaves with 7 to 13 wedge-shaped leaflets, and racemes of usually up to 3 purple flowers.

Swainsona rotunda is a species of flowering plant in the family Fabaceae and is endemic to inland areas of northern Western Australia. It is a prostrate herb with imparipinnate leaves with about 7 narrowly lance-shaped leaflets, and racemes of up to 4 lilac-coloured flowers.

<i>Swainsona similis</i> Species of plant

Swainsona similis is a species of flowering plant in the family Fabaceae and is endemic to inland eastern Australia. It is an erect or spreading perennial plant with imparipinnate leaves with 5 to 15 narrowly elliptic leaflets and racemes of 5 to 15 purple flowers.

References

  1. ↑ "Swainsona rostrata". Australian Plant Census. Retrieved 1 June 2024.
  2. 1 2 3 4 Thompson, Joy (1993). "A revision of the genus Swainsona (Fabaceae)". Telopea. 5 (3): 532–533. Retrieved 1 June 2024.
  3. ↑ "Swainsona rostrata". Australian Plant Name Index. Retrieved 1 June 2024.
  4. ↑ George, Alex; Sharr, Francis (2021). Western Australian Plant Names and Their Meanings (4th ed.). Kardinya, WA: Four Gables Press. p. 297. ISBN   9780958034180.
  5. ↑ "Swainsona rostrata". Northern Territory Government. Retrieved 2 June 2024.
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