 Plant species supported by tundra have small leaves, are short (74 mm to <5 m), tend to be deciduous, and have a high ratio of roots to shoots.They are composed mainly of perennial forbs, dwarf shrubs, grasses, lichens, and mosses.In comparison to tundra, boreal forest has a longer and warmer growing season and supports larger species diversity, an increase in canopy height, vegetation density, and biomass.