In between Homalocladium and Hygrophila which one is commonly known as swampweeds?
Homalocladium Homalocladium platycladum (centipede plant, tapeworm plant or ribbonbush) is a plant in the knotweed family from New Guinea and the Solomon Islands. It is the sole species in the genus Homalocladium.
Dipodium variegatum Dipodium variegatum, commonly known as blotched hyacinth-orchid or slender hyacinth-orchid, is a leafless mycoheterotrophic orchid that is endemic to south-eastern Australia. It forms mycorrhizal relationships with fungi of the genus "Russula".