A submersed Old World Plant ( Hydrilla verticillata ) having whorled , lance - shaped leaves and unisexual, solitary, axillary flowers.
软水草一种生在水中的东半球植物 ( 黑藻黑藻属 ),叶片呈螺纹形、矛 状, 雌雄异株, 花为单生 、 腋生.
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"submerged rocks"
"viewing subaqueous fauna from a glass-bottomed boat"
"submerged leaves"