作者

HSIEH, CHANG-FU

型態特徵

Aquatic floating herbs. Emerged leaves rosulate, rhombic to ovate-rhombic, coarsely dentate towards apex, the petioles inflated above the middle; submerged leaves opposite, pinnatisect. Flowers bisexual, axillary, solitary, pedicelled; calyx-tube short, adnate to the lower part of ovary, the limb 4-lobed, the segments often persistent and turning into horns after anthesis; petals 4, free; stamens 4, anther oblong, 2-locular, dehiscing logitudinally; ovary half-inferior, with a conical apex, 2-celled; ovule 1 in each cell. Fruit bony, in¬dehiscent, 1-seeded, with 2–4 horns; cotyledons very unequal.

屬

One genus about 30 species in tropical and temperate regions of the Old World. Two species and one variety in Taiwan.

參考文獻