A flower cluster in which stalks of nearly equal length spring from a common centre and form a flat or curved surface, characteristic of the parsley family (Apiaceae).
Here is an umbel flower cluster of poison hemlock (Conium maculatum), a highly poisonous biennial herbaceous flowering plant in the carrot family Apiaceae, native to Europe and North Africa. A hardy plant capable of living in a variety of environments, hemlock is widely naturalised in locations outside its native range. Here it is growing in parklands in Melbourne, Australia.
This post is part of the Wordless Wednesday meme,
and also part of the ABC Wednesday meme,
and also part of the Outdoor Wednesday meme.