Acronym Soup: PDQ ?

Questions

Common name for a number of species of water birds of the same family as ducks & swans?

Common name for a plant family comprising about 227 genera & 4450 species of mostly temperate herbs, & for its representative genus?

Common name for a plant family with about 50 genera & 1300 species?

Common name for a plant family, & for plants of the family's typical genus?

Common name for a plant of the sedge family?