Aquatic herbs; The rhizome is very short and has soft fibrous roots. The stem is erect or inclined, with a height of (6-) 12 ~ 35cm. The whole plant is smooth and hairless, with basal leaves or stem leaves, and the shape and size of the leaves are large.

Oldenlandia

Small to large, from heart-shaped wide oval, long oval to needle-shaped, 2 ~ 7 cm long and 0.8 ~ 5 cm wide, with short spikes or tapering at the top, round or shallow heart-shaped at the base, all-round, and curved veins. The petiole is 10 ~ 20cm long, and the base expands into a dehiscent sheath. The sheath is 2 ~ 4 cm long and has a tongue at the top, which is about 0.7 ~ 1 cm long. The raceme is drawn from the middle of the petiole. The petiole here expands into a sheath. Peduncle is short, long 1 ~ 1.5 cm, with 1 lanceolate bracts at the base. Inflorescence is erect in flowering period and curved downward in fruit period. Flowers are usually 3 ~ 5 (rare 10), or 1 ~ 3, blue.

The picture in Baidu Encyclopedia is wrong.