Micranthemum micranthemoideswas a small subaquatic glabrous annual that exhibited creeping stems and ascending branches.Micranthemum micranthemoidesgrew 5-20 cm in height.Micranthemum micranthemoideshad opposite, elliptic leaves measuring 25 mm. Leaves were entire. Flowers were both solitary and axillary. Each flower’s collora was white and measured 2 mm. Flowers contained two stamens, which were inserted around the collora’s throat.Micranthemum micranthemoidesflowered from September to October. Its seeds were oblong to narrowly obconic