Swainsona decurrens

Swainsona decurrens is an erect annual plant, that typically grows to a height of less about 50 cm (20 in) with robust stems often more than 5 mm (0.20 in) in diameter. Its leaves are imparipinnate, 5–15 mm (0.20–0.59 in) long on a short petiole with 20 to 30 narrowly elliptical leaflets mostly 10–30 mm (0.39–1.18 in) long and 2–10 mm (0.079–0.394 in) wide. There are lance-shaped stipules more than 10 mm (0.39 in) long at the base of the petiole. The flowers are arranged in racemes 150–200 mm (5.9–7.9 in) of 10 to 20 on a peduncle 1.0–1.5 mm (0.039–0.059 in) long, each flower 8–10 mm (0.31–0.39 in) long. The sepals are joined at the base, forming a tube 2–3 mm (0.079–0.118 in) long, the sepal lobes about the same length as the tube. The petals are red or purple, the standard petal 8–10 mm (0.31–0.39 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 about 3 mm (0.12 in) wide. Flowering occurs from May to September, and the fruit is an almost round pod 5–8 mm (0.20–0.31 in) long with the remains of a strongly curved style about 5 mm (0.20 in) long.

This species of pea grows in sandy or stony soil in the Gascoyne, Little Sandy Desert and Pilbara bioregions of northern inland Western Australia.

== References ==