Alismataceae >
Carpels more than 6 Alismataceae
Flowers unisexual Sagittaria
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