Alismataceae
Carpels more than 6 Alismataceae
Flowers unisexual Sagittaria
Leaves saggitate, up to 20 cm long; the sheath with obtuse auricles. Flowers 10–15 mm diam. Erect emergent aquatic herb up to 1 m high. Centennial Park. Introd. from S. America. Fl. spring–summer Sagittaria montevidensis
Leaves elliptic, up to 20 cm long; the sheath acuminate towards the top. Flowers 10–15 mm diam. Erect emergent aquatic up to 50 cm high. Georges River. Introd. from N. America. Fl. spring–summer Sagittaria platyphylla