Dandilion.

Dandelion is a widely distributed perennial weed. The mature plant arises from a strong, deep taproot and has no visible stem. Leaves are clustered in a rosette at the base of the plant. Dandelion can reproduce from seed almost year-round or it can regrow from its taproot. Flower heads are borne singly on the tip of a 3 to 12 inch long hollow stalk, are bright yellow, 1 to 2 inches across, and consist of petal-like ray flowers. The bristles on the seeds can clog cultivation equipment.