broad-leaved weed A common sedge weed Monochoria vaginalis (monochoria), California arrowhead Sagittaria montevidensis, Gregg arrowhead Sagittaria longiloba, Ducksalad Heteranthera limosa, Echinodorus berteroi and E. cordifolius (Burhead), Ammannia spp (Redstems), Bacopa spp. (Water hyssops), Alisma plantago-aquatica (Common water plantain). Grows as a weed in the rice field. Can be distinguished from rice plant by the leaf shape, venation, stem cross-section and plant shape leaf shape. plant_trait_ontology TO:0000101 weed damage response trait