Dandelions are what’s called an apomictic plant. Apomixis is essentially asexual reproduction. A single dandelion, even in quarantine, will create seeds that are identical to itself. As random mutations happen over time, a microspecies will form, since genetic changes are not contributed back into any gene pool. Some botanists have identified thousands of separate dandelion microspecies, often confined to a single meadow.
Also, dandelions are delicious, and are extremely high in Vitamin A and C.