What type of marshy ecosystem is known for having no trees and is always wet due to poor drainage?

Marshes are characterized as wetland ecosystems that are dominated by herbaceous plants rather than woody plants, which is why they have no trees. They typically experience poor drainage, leading to constant saturation and waterlogged conditions. This wetness is a defining feature of marshes, setting them apart from swamps, which do have trees, and other ecosystems like tundras or basins, which have different characteristics. Marshes serve as vital habitats for various wildlife and play important roles in water filtration, flood control, and as buffers against storm surges. Their unique environmental conditions foster a rich diversity of plant and animal life adapted to these wet, swampy environments.