In what phylum do we see winged seeds and winged pollens?

Gymnosperms

These vascular and seeded plants have both winged seed and pollen wings. If you think of a pine tree, the seeds released typically have wings on them - these seeds are sometimes called helicopters for this reason. These seeds have wings for enhanced dispersal of embryos inside the seeds. Likewise, pollen wings are utilized for enhanced pollination and fertilization. I hope this clears things up for you.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.