HYDATELLACEAE

 

Aquatic or semi-aquatic herbs, Glabrous annual with a basal aggregation of leaves Leaves alternate; sessile; simple; exstipulate; Plants monoecious, nectaries absent Inflorescences usually scapiflorous; terminal; with involucral bracts (the involucral bracts 2–4. Flowers minute to small; 1 merous. Perianth absent. Stamens 1. Anthers basifixed; non-versatile; dehiscing via longitudinal slits; bilocular; Pollen grains aperturate; 1 aperturate; sulcate. Gynoecium ostensibly 1 carpelled. The pistil 1 celled. Gynoecium monomerous, 1 ovuled. Placentation apical. Ovary 1 locular; shortly stipitate. Gynoecium non-stylate or stylate, Styles 3–10. Stigmas 3–10. Placentation apical. Ovules in the single cavity 1; pendulous, Endosperm formation cellular. Fruit non-fleshy. Fruit 1 seeded. Seeds minute. Seeds with starch. Embryo rudimentary .