Senna costata
Senna costata is a species of flowering plant in the family Fabaceae and is endemic to northern Australia. It is a shrub or small tree with pinnate leaves with four or five pairs of narrowly elliptic leaflets, and yellow flowers arranged in pairs or groups of five to eight, with ten fertile stamens in each flower.
Description
Senna costata is a shrub or small tree that typically grows to a height of, its stems and foliage softly-hairy. The leaves are pinnate, long on a petiole up to long with four or five pairs of narrowly elliptic leaflets long and wide. The flowers are yellow and arranged in upper leaf axils in groups of five to eight on a peduncle long, each flower on a pedicel long. The petals are long and there are ten fertile stamens, the anthers about long. Flowering occurs in winter and spring, and the fruit is a flat pod long, wide and usually curved.
Taxonomy
This species was first formally described in 1915 by John Frederick Bailey and Cyril Tenison White who gave it the name Cassia costata in the Queensland Agricultutal Journal from specimens collected by near Woolgar, north of Richmond in 1915. In 1989, Barbara Rae Randell reclassified the species as Senna costata in the Journal of the Adelaide Botanic Garden. The specific epithet means "ribbed", referring to the stems of this species.
Distribution and habitat
Senna costata grows on pindan plains in grassy woodland in northern Western Australia, the Northern Territory and northern Queensland.