Portulaca molokiniensis belongs to the Portulaceae (the Purslane family). It is a perennial herb that is a rare Hawaiian endemic; Molokini and Kaho'olawe. This herb grows on volcanic tuff, loose rock at the base of sea cliffs and on steep rocky slopes. It branches at or below the soil line, form clumps and can reach 30-45 cm in height. The leaves are thick, pale green, rounded and arranged in four rows along the stems. The flowering stalks are borne and the small bright yellow cup-shaped flowers bloom sporadically all year round.