Quickly after being seeded (5my) the mangrove tree adapted it's flowers for better wind dispersal due to lack of pollinators. This adaptation took an abnormally long time to develop since mangrove trees spread very slowly at first. The trees relied mainly on pollinators for their coverage on Earth but on this planet they could only use wind. Eventually the trees were able to build forests over several decades and wind dispersal became a lot more effective. The reproductive organs of their flowers grew longer for the wind to carry pollen off a lot faster, the coloration of these flowers was also dulled a bit since there's no reason to keep it. The seeds of these mangroves became less developed, resembling more average tree seeds. All of the mangrove's descendants come from plants with this type of flower.

A descendant from the Spindleroot family, the Leechroot is a parasitic terrestrial mangrove that grows it's roots into the insides of other trees. They do not grow leaves and gain all of their energy from the soil and trees they grow within. The Leechroot will always try to grow as vertically as possible, not to gather sunlight but instead to spread as many seeds as possible. Their flowers have lost their petals in colors in exchange for very long reproductive organs.

The Stepgrove is an incredibly important mangrove descendant on Alluvius. The plant has a very reduced stem and only grows about a foot tall. Instead of growing as high as possible to out-compete other plants, the Stepgrove uses rhizomes to spread out as much as possible. They form the primary vegetation of jungle edges and tropical savannas. Because of their sheer density, Stepgrove biomes form a humid environment underneath them which creates a stable environment for animals and retains water for the plants in dryer areas. Certain Stepgrove plains could be considered the largest organisms on Alluvius since they clone themselves in a similar way to Pando on Earth.