Based on the nature of the habitat, succession of plants is of two types hydrarch and xerarch. Hydrosere or hydrarch starts in regions where water is in plenty and progresses from hydric to mesic conditions. On the other hand, xerosere or xerarch starts in region where moisture is present in minimal or negligible amount such as dry deserts, rocks etc.and it progresses from xeric to mesic conditions. Hence both hydrarch & xerarch successions lead to medium of water conditions.
