Swainsona pterostylis

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Swainsona pterostylis
Swainsona pterostylis.jpg
In the Cape Range National Park
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. pterostylis
Binomial name
Swainsona pterostylis
Synonyms [1]
  • Astragalus pterostylisDC.
  • Diplolobium walcottiiF.Muell.
  • Diplolobium walcottiiF.Muell. isonym
  • Swainsona occidentalisF.Muell.
  • Swainsonia occidentalisF.Muell. orth. var.
Habit near Pardoo Station Swainsona pterostylis habit.jpg
Habit near Pardoo Station

Swainsona pterostylis is a species of flowering plant in the family Fabaceae and is endemic to northern parts of Western Australia. It is a low-growing or prostrate perennial herb, with imparipinnate leaves with mostly 11 to 19 broadly elliptic leaflets, and racemes of 5 to more than 30 purple or violet flowers.

Contents

Description

Swainsona pterostylis is low-growing or prostrate perennial herb, that typically grows to a height of up to about 15–40 cm (5.9–15.7 in) high, and usually has 3 hairy stems. Its leaves are imparipinnate, mostly 40–120 mm (1.6–4.7 in) long on a petiole, with mostly 11 to 19, broadly elliptic to narrowly egg-shaped with the narrower end towards the base, the side leaflets 5–30 mm (0.20–1.18 in) long and 2–10 mm (0.079–0.394 in) wide. There is a stipule 2–10 mm (0.079–0.394 in) long at the base of the petiole. The flowers are arranged in racemes 50–300 mm (2.0–11.8 in) long with 5 to more than 30 flowers on a peduncle about 1–3 mm (0.039–0.118 in) wide, each flower 7–10 mm (0.28–0.39 in) long on a pedicel 2–3 mm (0.079–0.118 in) long. The sepals are joined at the base, forming a tube about 2 mm (0.079 in) long, the sepal lobes equal to or about as long as the tube. The petals are purple to violet, the standard petal about 9–10 mm (0.35–0.39 in) long and 10–14 mm (0.39–0.55 in) wide, the wings 8–10 mm (0.31–0.39 in) long, and the keel about 7–9 mm (0.28–0.35 in) long and 2.5–3.5 mm (0.098–0.138 in) deep. [2] Flowering occurs from April to October, [3] and the fruit is oblong to almost spherical, 6–12 mm (0.24–0.47 in) long and 5–8 mm (0.20–0.31 in) wide. [2]

Taxonomy and naming

This species was first formally described in 1825 by Augustin Pyramus de Candolle who gave it the name Astragalus pterostylis in his Prodromus Systematis Naturalis Regni Vegetabilis . [4] In 1967, Reinier van den Brink transferred the species to Swainsona as S. pterostylis. The specific epithet (pterostylis) means "having a style". [5]

Distribution and habitat

Swainsona pterostylis grows on coastal sandhills and red claypans, often in limy or salty soils in the Avon Wheatbelt, Carnarvon, Dampierland, Gascoyne, Geraldton Sandplains, Great Sandy Desert, Murchison, Pilbara and Yalgoo bioregions of northern Western Australia. [3]

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.

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

Swainsona campylantha, commonly known as Gilgai Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Australia. It is a low-growing perennial with imparipinnate leaves usually with up to 7 narrowly lance-shaped to narrowly elliptic leaflets, and racemes of 2 to 10 pink to purple flowers.

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 decurrens is a species of flowering plant in the family Fabaceae and is endemic to northern inland areas of Australia. It is an erect annual with imparipinnate leaves usually with 15 to 19 narrowly elliptical leaflets and racemes of 20 to 30 red or purple flowers.

Swainsona dictyocarpa is a species of flowering plant in the family Fabaceae and is endemic to central areas of South Australia. It is a small erect perennial herb with imparipinnate leaves with 3 to 7 elliptic leaflets, and racemes of purple flowers in racemes of 2 to 6.

<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 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 gracilis is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is a prostrate or ascending perennial herb with imparipinnate leaves with up to 15 wedge-shaped or narrowly oblong leaflets, and racemes of up to 4 purple or blue 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 incei is a species of flowering plant in the family Fabaceae and is endemic to inland Western Australia. It is an erect or ascending annual, sometimes perennial herb with imparipinnate leaves with 5 to 9 lance-shaped to elliptic leaflets, and racemes of 2 to 30 purple flowers.

Swainsona katjarra, commonly known as Birriliburu swainsona, is a species of flowering plant in the family Fabaceae and is endemic to inland Western Australia. It is an erect annual herb with imparipinnate leaves with 4 to 6 lance-shaped to egg-shaped to elliptical leaflets, and racemes of 15 to 25 magenta 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 leeana is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Australia. It is a small prostrate perennial, possible perennial with imparipinnate leaves with 5 to 7 broadly egg-shaped or elliptic leaflets, and racemes of up to 3 purple or yellow flowers.

Swainsona luteola 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.

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

Swainsona murrayana, commonly known as slender Darling-pea or slender Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to south-eastern mainland Australia. It is a prostrate, low-growing or erect perennial herb, with imparipinnate leaves with 3 to 11 linear to elliptic leaflets and racemes of 3 to 11 pink or purple flowers.

Swainsona oliveri is a species of flowering plant in the family Fabaceae and is endemic to south-western Australia. It is a slender, prostrate to ascending annual or perennial herb with imparipinnate leaves with 9 to 13 narrowly egg-shaped leaflets, the narrower end towards the base, and racemes of up to 4 cream-coloured to yellow flowers, sometimes with a pink tinge.

<i>Swainsona oroboides</i> Species of flowering plants

Swainsona oroboides, commonly known as variable swainsona or kneed Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to Australia. It is a prostrate or ascending perennial plant with imparipinnate leaves with 3 to 7 narrowly elliptic leaflets and racemes of 3 to about 16 purple 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.

References

  1. 1 2 "Swainsona pterostylis". Australian Plant Census. Retrieved 16 May 2024.
  2. 1 2 Thompson, Joy (1993). "A revision of the genus Swainsona (Fabaceae)". Telopea. 5 (3): 481–483. Retrieved 16 May 2024.
  3. 1 2 "Swainsona pterostylis". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. ↑ "Swainsona pterostylis". Australian Plant Name Index. Retrieved 16 May 2024.
  5. ↑ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 286. ISBN   9780958034180.
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