CALLITRICHACEAE,  Water Starwort Family

Small herbs growing in mud or submersed in water with floating rosettes of leaves at stem tips; leaves opposite; monooecious; flowers minute. in leaf axils, hypogynous, monosporangiate; the two kinds usually in different axils; periantb absent; flower subtended by 2 small bracts; stamen 1; carpels 2, united; styles 2, fiIiform; ovary 4-loculed by growth of false septum in each carpel; fruit separating into 4 one.seeded portions. Mature fruit is necessary for identification.