just like seeds from flower ,苇絮 is coming from 芦苇（reed). My homeland is famous for this kind of plant named Panjin city.

"Reed flocculant" （苇絮） is not a plant. It's the flower of Reed（芦苇） and Blowing in the Wind.

苇絮 是芦苇的花。 你在Google 里搜索一下，可以看到很多照片。

百度一下

苇 comes from 芦苇; 絮 is used as 柳絮、棉絮