Dandelion n. : A well-known plant of the genus Taraxacum (T. officinale, formerly called T. Dens-leonis and Leontodos Taraxacum) bearing large, yellow, compound flowers, and deeply notched leaves.

Example:
How can I tell the difference between Dandelion and wild lettuce?

Taxonomy
Dandelion, flowers, Taraxacum, plant, parachute, the leaves, dandelion flower, stems, flower head, seed, achene, clock, caffeic acid, dandelion flowers, luteolin, Invasive plant species, the seeds, unranked.

Defination from the web:
dandelion flower dries out for a day or two and then the seed-bearing parachutes expand and lift ... Away from their native regions, some dandelion species have become established in the Americas, Australia, and New Zealand, and are now common ...