Senna septemtrionalis (Viv.) H.S.Irwin & Barneby

• a shrub or small tree growing 1-5 m tall.
• its once-compound leaves (6-10.5 cm long) have 3-5 pairs of leaflets with pointed tips.
• these leaves have a small cone-shaped structure between the lowest three or four pairs of leaflets.
• its yellow flowers have five petals and six or seven fully-formed stamens, two of which are larger than the others.
• its cylindrical pods (5-10 cm long and 7-12 mm wide) are usually borne in an upright position on stiff stalks.

[From: Environmental Weeds of Australia]