A submersed Old World Plant ( Hydrilla verticillata ) having whorled , lance - shaped leaves and unisexual, solitary, axillary flowers.
軟水草一種生在水中的東半球植物 ( 黑藻黑藻屬 ),葉片呈螺紋形、矛 狀, 雌雄異株, 花為單生 、 腋生.
互聯(lián)網(wǎng)
"submerged rocks"
"viewing subaqueous fauna from a glass-bottomed boat"
"submerged leaves"