title: Coprosma kawaikiniensis (Rubiaceae) a new species from the Dubautia-Sadleria shrubland-fernland community on Kaua'i, Hawaiian Islands.
abstract: Coprosma kawaikiniensis K.R. Wood, Lorence & Kiehn (Rubiaceae), a rare endemic tree from Kaua'i, Hawaiian Islands, is described and illustrated along with a previously undescribed endemic plant community, the Dubautia-Sadleria shrubland-fernland (DSSF). The new species differs from Hawai'i congeners by its combination of opposite, long, elliptic to narrowly elliptic or ovate-elliptic leaves with revolute margins; caducous stipules 7-10 mm long, externally glabrous, densely hirtellous-pilose near the margins of the inner surface; unbranched inflorescences with peduncles 20-28 mm long; flowers 6-8 per cluster; and persistent calyx tube with 4-8 irregular dentate lobes. Known only from the windward slopes and ridges of southeastern Kaua'i below the Kawaikini summit, Coprosma kawaikiniensis falls into the IUCN Critically Endangered (CR) Red List category.
authors.affiliation: National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI 96741, USA.
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Wood
authors.affiliation: National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI 96741, USA.
authors.forename: David H
authors.initials: DH
authors.lastname: Lorence
authors.affiliation: National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI 96741, USA; Department of Botany and Biodiversity Research and Core Facility Botanical Garden, University of Vienna, Rennweg 14, 1030 Vienna, Austria.
authors.forename: Michael
authors.initials: M
authors.lastname: Kiehn
keywords: Coprosma; Critically Endangered; Dubautia-Sadleria shrubland-fernland; Hawaiian Islands; Kaua‘i; Rubiaceae; high endemism; new species