achene achenes blow blowing clock closeup floating globe globes happy luck mature matures maturing phase phases seed seeds wish yellow allergy seeding Asteraceae close-up.macro compositae damage Dandelion fly herb medical pericarp plant summer Taraxacum wind wishie blue sky sphere ball common dandelion clock dispersal head parachute ball pattern puff puff ball puffs round spherical spread spreading Taraxacum officinale texture weed widespread wind-aided wind-blown wind-spread