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Swainsona rotunda
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. DescriptionSwainsona rotunda is prostrate herb with imparipinnate leaves up to 25 mm (0.98 in) long with about 7 narrowly lance-shaped leaflets, the side leaflets mostly 5–10 mm (0.20–0.39 in) long and mostly about 1.5 mm (0.059 in) wide. There is a stipule 1–2 mm (0.039–0.079 in) long at the base of the petiole. The flowers are arranged in racemes 15–25 mm (0.59–0.98 in) long with about 7 flowers on a peduncle less than 0.5 mm (0.020 in) wide, each flower about 4 mm (0.16 in) long on a pedicel about 0.5 mm (0.020 in) long. The sepals are joined at the base, forming a tube about 1 mm (0.039 in) long, the sepal lobes about as long as the tube. The petals are lilac-coloured, the standard petal about 4 mm (0.16 in) long and wide, the wings about 4 mm (0.16 in) long, and the keel about 4 mm (0.16 in) long and 1.5 mm (0.059 in) deep. Flowering has been observed in August, and the fruit is more or less round, about 7 mm (0.28 in) long and wide.[2][3] Taxonomy and namingSwainsona rotunda was first formally described in 1993 by Joy Thompson in the journal Telopea from specimens in 1975.[2][4] The specific epithet (rotunda) means "round",[5] referring to the shape of the fruit.[2] Distribution and habitatThis species of pea grows in red, sandy loam in the Gascoyne and Murchison bioregions of northern inland Western Australia.[2][3] References
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