What is the meaning of Mare's_tail?

Any plant of various species with inflorescences resembling a horse's tail.

  1. Any of the water plants in the genus Hippuris,
    1. especially Hippuris vulgaris, common mare's tail;
  2. Conyza canadensis, an annual weed also known as horseweed and Canadian fleabane;
  3. Equisetum spp., fern allies also known as horsetail and pipeweed.

Any of the water plants in the genus Hippuris,

  1. especially Hippuris vulgaris, common mare's tail;

especially Hippuris vulgaris, common mare's tail;

Conyza canadensis, an annual weed also known as horseweed and Canadian fleabane;

Equisetum spp., fern allies also known as horsetail and pipeweed.

Source: wiktionary.org