Swainsona disjuncta

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Swainsona disjuncta
Status DECF P1.svg
Priority One — Poorly Known Taxa (DEC)
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. disjuncta
Binomial name
Swainsona disjuncta

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.

Contents

Description

Swainsona disjuncta is a prostrate perennial herb, that has several stems arising from a slender taproot. The leaves are imparipinnate, mostly 15–80 mm (0.59–3.15 in) long with 3 to 9 egg-shaped leaflets with their narrower end towards the base, the leaflets mostly 5–15 mm (0.20–0.59 in) long and 2–10 mm (0.079–0.394 in) wide on with narrow stipules 3–8 mm (0.12–0.31 in) long at the base of the petioles. The flowers are purple, pink or red, arranged in racemes of 3 to 15 on a peduncle 0.5–1.5 mm (0.020–0.059 in) wide with slender bracts 3–4 mm (0.12–0.16 in) long at the base. The sepals are joined at the base and hairy, forming a tube about 1 mm (0.039 in) long with lobes usually twice as long as the tube. The standard petal is 7–10 mm (0.28–0.39 in) long, the wings 7–9 mm (0.28–0.35 in) long and the keel 8–10 mm (0.31–0.39 in) long and 3.5–4.5 mm (0.14–0.18 in) deep. The fruit is a pod about 10 mm (0.39 in) long and 6 mm (0.24 in) wide. [2]

Taxonomy and naming

Swainsona disjuncta was first formally described in 1993 by Joy Thompson in the journal Telopea , from specimens collected by Roy Pullen about 115 km (71 mi) east of Norseman in 1979. [2] [3] The specific epithet (disjuncta) means "separate", referring to the disjunct distribution of the species. [2]

Distribution

This species of pea grows in disjunct areas of central Australia, including the Fraser Range in southern Western Australia, in nearby areas of the Northern Territory and Western Australia, and on the Eyre Peninsula of southern South Australia. [2] [4] [5]

Conservation status

Swainsona disjuncta is listed as "Threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions, [5] meaning that it is in danger of extinction. [6]

Related Research Articles

<i>Swainsona</i> Genus of legumes

Swainsona is a genus of about 85 species of flowering plants in the family Fabaceae, and is endemic to Australia. Plants in this genus are herbs or subshrubs with imparipinnate leaves and usually purple flowers similar to others in the family.

<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 colutoides</i> Species of plant

Swainsona colutoides, commonly known as bladder senna or bladder vetch, is a species of flowering plant in the family Fabaceae and is endemic to arid areas of Australia. It is an erect annual, shrub-like herb, with imparipinnate leaves usually with up to 13 to 17 egg-shaped leaflets with the narrower end towards the base, and racemes of 10 to 20 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.

Swainsona adenophylla, commonly known as violet swainson-pea or violet Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to arid areas of central Australia. It is a slender, erect or spreading perennial herb with imparipinnate leaves with three to nine linear to narrowly egg-shaped leaflets, and racemes of pink or purplish flowers in racemes of ten to twenty.

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

Swainsona affinis, commonly known as common poison pea, is a species of flowering plant in the family Fabaceae and is endemic to arid areas of inland Australia. It is a prostrate perennial herb with imparipinnate leaves with 7 to 25 broadly elliptic leaflets, and racemes of purple, pink, yellow or white flowers.

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

Swainsona beasleyana is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia. It is a low-lying perennial herb with imparipinnate leaves usually with 15 to 19 egg-shaped leaflets with the narrower end towards the base, and racemes of 3 to 8 pale or dark purple flowers.

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

Swainsona brachycarpa, commonly known as slender swainson-pea, is a species of flowering plant in the family Fabaceae and is endemic to eastern Australia. It is a prostrate or ascending perennial herb with imparipinnate leaves usually with 9 to 13 egg-shaped to narrowly elliptic or egg-shaped leaflets, and racemes of up to 12 white, purple or dark red flowers.

Swainsona bracteata is a species of flowering plant in the family Fabaceae and is endemic to eastern Australia. It is a perennial herb with imparipinnate leaves usually with 19 to 25 narrowly egg-shaped leaflets, and racemes of about 20 white, pale pink or pale purple flowers.

<i>Swainsona burkei</i> Species of plant endemic to Australia

Swainsona burkei is a species of flowering plant in the family Fabaceae and is endemic to northern Australia. It is a prostrate or perennial subshrub with imparipinnate leaves usually with 5 to 11 oblong to narrowly egg-shaped leaflets, and racemes of 5 to 10 purple flowers.

<i>Swainsona burkittii</i> Species of plant endemic to Australia

Swainsona burkittii, commonly known as woolly Darling pea, is a species of flowering plant in the family Fabaceae and is endemic to inland Australia. It is an erect or low-lying perennial with imparipinnate leaves usually with 15 to 30 egg-shaped to more or less circular leaflets, and racemes of up to fifty dark reddish-purple flowers.

Swainsona cadellii is a species of flowering plant in the family Fabaceae and is endemic to inland New South Wales. It is a shrubby perennial with imparipinnate leaves usually with 5 to 15 mostly narrowly egg-shaped leaflets, and racemes of 15 to 20 white, pink or purple flowers.

Swainsona calcicola is a species of flowering plant in the family Fabaceae and is endemic to north-western Western Australia. It is a prostrate or ascending, low-growing perennial with many stems, imparipinnate leaves usually with 7 to 11 broadly egg-shaped leaflets with the narrower end towards the base, and racemes of usually 4 or 5 pink, purple or red 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.

<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 complanata is a species of flowering plant in the family Fabaceae and is endemic to northern Western Australia. It is an erect, annual herb with imparipinnate leaves usually with up to 13 narrowly egg-shaped leaflets with the narrower end towards the base, and racemes of up to 20 mauve to maroon flowers.

Swainsona cornuta is a species of flowering plant in the family Fabaceae and is endemic to the west of Western Australia. It is a low-lying, annual or perennial herb with imparipinnate leaves usually with about 7 elliptic leaflets and racemes of 3 to 7 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.

References

  1. ↑ "Swainsona disjuncta". Australian Plant Census. Retrieved 5 December 2022.
  2. 1 2 3 4 Thompson, Joy (1993). "A revision of the genus Swainsona (Fabaceae)". Telopea. 5 (3): 527–528. Retrieved 2 December 2023.
  3. ↑ "Swainsona disjuncta". Australian Plant Name Index. Retrieved 5 December 2023.
  4. ↑ "Swainsona disjuncta". Northern Territory Government. Retrieved 5 December 2023.
  5. 1 2 "Swainsona disjuncta". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  6. ↑ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 5 December 2023.
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