CAREX AND UNCINIA (CYPERACEAE, CARICEAE) FROM THE JUAN FERNANDEZ ARCHIPELAGO, CHILE

Abstract

Ten members of the tribe Cariceae (Cyperaceae) occur on the Juan Fernández Archipelago: four species of Carex and six of Uncinia. Eight of the ten species occur on Alejandro Selkirk Island (= Masafuera; 50 km2) while four are known from Robinson Crusoe Island (= Masatierra; 48 km2). Carex fernandezensis, C. stuessyi, Uncinia aspericaulis, and U.
macloviformis are newly described from the archipelago and all are endemic to the islands. Only two species, Carex berteroniana and Uncinia douglasii, both endemics, are of frequent occurrence and each occurs on both islands. Another endemic, Uncinia costata, is known only from the type locality on Alejandro Selkirk. The three remaining species, Uncinia
phleoides, U. tenuis, and Carex phalaroides, the last here reported for the first time from the archipelago, also occur on the South American mainland. Lectotypes are chosen for the
names Uncinia costata and U. tenuis f. firmula. Additionally, a new section of Carex, sect. Pellucidae, is circumscribed in this paper for the sectional placement of C. stuessyi and cognate species.