Richardia Kunth
Calyx 6-lobed. Stems mostly more than 15 cm long. Mericarps 3
Mericarps with large papillae; adaxial face with a raised ridge, 2–3 mm long. Leaves elliptic to ovate or obovate, up to 5 cm long. Flowers c. 20 or more per head. Corolla mostly 6-lobed; tube 3–8 mm long. Prostrate to ascending annual with stems up to 50 cm long. Coast. Weed of waste places and cultivation. Introd. from S. America. Fl. spring–autumn. Mexican Clover or Brazil Weed Richardia brasiliensis
Mericarps with short papillae; adaxial face with a narrow groove, 2–4 mm long. Leaves elliptic to obovate up to 7 cm long. Flowers c. 20 or more per head. Corolla 6-lobed; tube 2–5 mm long. Decumbent to erect annual with stems up to c. 80 cm long. Coast. Weed. Uncommon. Introd. from S. America. Fl. spring–summer Richardia scabra