Swainsona thompsoniana
From Wikipedia, the free encyclopedia
| Swainsona thompsoniana | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Genus: | Swainsona |
| Species: | S. thompsoniana |
| Binomial name | |
| Swainsona thompsoniana | |
Swainsona thompsoniana is a species of flowering plant in the family Fabaceae and is endemic to inland northern Western Australia. It is a prostrate annual herb, with imparipinnate leaves with 3 to 6 pairs of narrowly egg-shaped to egg-shaped leaflets with the narrower end towards the base, and racemes of up to 3 mauve and cream-coloured to yellow flowers.
Swainsona thompsoniana is an erect, annual herb with imparipinnate leaves up to 15–20 mm (0.59–0.79 in) long with 3 to 6 pairs of narrowly egg-shaped to egg-shaped leaflets, the leaflets mostly 4–13 mm (0.16–0.51 in) long and 2–4 mm (0.079–0.157 in) wide. There is a stipule about 2.0–2.2 mm (0.079–0.087 in) long at the base of the petiole. The flowers are arranged in racemes 20–60 mm (0.79–2.36 in) long with up to 3 flowers on a peduncle 0.20–0.25 mm (0.0079–0.0098 in) wide, each flower 5–7 mm (0.20–0.28 in) long on a pedicel about 2–4 mm (0.079–0.157 in) long. The sepals are joined at the base, forming a tube 1.0–1.4 mm (0.039–0.055 in) long, the sepal lobes 2.0–2.5 mm (0.079–0.098 in) long. The petals are mauve with a cream-coloured to yellow centre, the standard petal about 5.7–6.6 mm (0.22–0.26 in) long and 5.0–5.5 mm (0.20–0.22 in) wide, the wings 4.8–5.2 mm (0.19–0.20 in) long, and the keel 6.5–7 mm (0.26–0.28 in) long and 2.4–2.6 mm (0.094–0.102 in) deep. The fruit is 38–60 mm (1.5–2.4 in) long and 5–6 mm (0.20–0.24 in) wide.[2][3]
Taxonomy
Swainsona thompsoniana was first formally described in 2013 by R.W.Davis and P.J.H. Hurter in the journal Nuytsia from specimens collected on Hamersley Station.[2][4] The specific epithet (thompsoniana) honours Joy Thompson "in recognition of her contribution to the taxonomy of Swainsona".[2]