Senna alexandrina Mill  

Herbaceous to woody stemmed shrub up to c. 2 (-3) m tall. Leaves up to c. 12 (-25) cm long; petiole without gland; leaflets up to 6 (-10) pairs, linear-lanceolate to elliptical, up to 6 cm x 5 -10 (-15) mm, acute, mucronate with percurrent midrib. Racemes many-flowered. Sepals greenish yellow to yellow, up to c. 8 mm long, obovate, obtuse. Petals yellow with darker veins, obovate, up to c. 17 mm long. Lower two stamens longer, 5 medium-sized, 2 (3) posterior short, much reduced. Pods compressed, flat, oblong to broadly oval, somewhat curved, 5 cm x 23 mm. Seeds subquardate, up to 6 x 4 mm, reticulately ridged or rugose, shiny green to pale.