Taraxacum is a large genus of flowering plants in the family Asteraceae. They are native to Eurasia and North and South America, and two species, T. officinale and T. erythrospermum, are found as weeds worldwide. Both species are edible in their entirety.
The common name dandelion (from French dent-de-lion, meaning "lion's tooth") is given to members of the genus, and like other members of the Asteraceae family, they have very small flowers collected together into a composite flower head. Each single flower in a head is called a floret. The downy seedhead is called a 'dandelion clock' as blowing on it, supposedly, will result in as many seeds left on the seedhead as it is the time o'clock.
This post is part of the Weekend in Black & White meme.