Dandelion seeds. Closeup of seeds leaving the seedhead (or clock) of the common dandelion (Taraxacum officinale). Each individual seed, of which there can be up to 400 on any one clock, is topped by a fine parachute of hairs (the pappus), which allows the seeds to be borne great distances by the wind. The dandelion is a common plant of grassland, and is a serious weed in gardens.
