Erubia is a spiny, evergreen shrub which can potentially grow to 18 feet in height. Sometimes, this shrub grows from a single stem, but often it branches from the base.
Mature shrubs have minute, whitish, star-shaped hairs on their leaves and petioles.
These hairs are longer on younger shrubs and they appear on the twigs, and flowers of these younger individuals. The leaves of this shrub are alternate and lanceolate to lanceolate-oblong shaped. The fruits are round, shiny, black berries. This shrub seems to flower and produce fruit throughout the year. Whether or not it reaches a flowering peak during a certain season is unknown, but its seed production appears to be abundant.