Lacistema morrocoensis, a new Colombian species of Lacistemataceae, and the extension of L. macbridei distribution to the country

Lacistema morrocoensis, a Critically Endangered species known from two localities in rocky outcrops of the Guiana Shield in the departments of Amazonas and Vaupés, Colombia, is described and illustrated. Description is based on specimens collected during field expeditions carried out to document the flora of the upper and middle Apaporis River basin, including Cerro Morroco, one of the poorest known floristic areas of the Colombian Amazon. As a contribution to Colombian flora, we also report the new record of L. macbridei for the country and provide an identification key for the species of the genus in Colombia.