LAUSR

Abstract. In the last 3 years, significant advances have occurred in our knowledge of the flora of the northern Baja California Pacific Islands. The availability of herbarium specimen data has been significantly increased, and 2 expeditions were undertaken to 7 of the 8 islands in 2015 and 2016. These events have resulted in a wealth of new plant records from the islands, which are here reported with updated taxonomy for the archipelago. The results include 586 vascular plant taxa on the Baja California Northern Pacific Islands; 118 taxa were new, and 54 previously reported taxa were vouchered. The checklists include the nativity of the taxa and highlight new records discovered through fieldwork, as well as those that were hidden in herbaria until now. The declaration of these islands as a new UNESCO Biosphere Reserve in late 2016 makes these new records of particular conservation importance, bettering our baseline understanding of these islands’ ecosystems.