在静水池沼的水面上,常有一种漂浮水面,细小如沙的水生植物,这就是世界上最小的有花植物——无根萍(Wolffia arrhiza)。它的花也是世界上最小的花。无根萍属浮萍科植物又名微萍,俗称大球藻。植物呈扁的半球形,体长才1毫米,宽不及1毫米,漂浮水面,往往被误认为是泡沫。其个体用肉眼勉强可见,既无根,也无叶。植物体中薄壁细胞的胞间隙发达,细胞中含大量叶绿体。它多以芽繁殖形成新个体,在条 On the water surface of the still pond, there is a kind of floating water surface, small as sand aquatic plants, which is the world’s smallest flowering plant - Wolffia arrhiza. Its flowers are also the smallest flowers in the world. Rhinopithera rhododendron is also known as micro-Ping, commonly known as algae. Plant was flat hemispherical, body length of 1 mm, width less than 1 mm, floating surface, often mistaken for a bubble. The individual barely visible with the naked eye, neither root nor leaf. Parenchyma cells in the cell gap developed, cells contain a large number of chloroplasts. It multiplies more buds to form new individuals in the bar