Silene hawaiiensis

Silene hawaiiensis
Name	Silene hawaiiensis
Status	G2
Status system	TNC
Genus	Silene
Species	hawaiiensis
Authority	Hillebr.

Silene hawaiiensis is a perennial flowering plant in the family Caryophyllaceae endemic to the island of Hawaiʻi. It occupies specialized alpine and subalpine niches on Mauna Kea and Mauna Loa and has been the subject of conservation attention by agencies such as the United States Fish and Wildlife Service and local organizations including the Hawaiʻi Department of Land and Natural Resources. Botanists and conservationists often reference specimens in the Bishop Museum herbarium and reports from researchers associated with the University of Hawaiʻi at Mānoa.

Description

Silene hawaiiensis is a mat-forming or cushion-forming herb with a woody taproot and branching caudex, producing low-growing stems and a basal rosette of leaves. Populations are characterized by small, opposite leaves and infl orescences of solitary or few-flowered cymes bearing tubular calyces and five-petaled corollas, with floral morphology comparable to other members studied in the genus by workers at the Royal Botanic Gardens, Kew and the Missouri Botanical Garden. The flowers exhibit traits that have drawn interest from ecologists associated with the National Park Service and the Smithsonian Institution for studies of island endemism and pollination syndromes.

Taxonomy and Nomenclature

The species was described in the 19th century by Wilhelm Hillebrand, and the epithet reflects its Hawaiian provenance; taxonomic treatments appear in floras compiled by authorities such as the Flora of North America project and regional checklists curated by the Bureau of Land Management and the United States Department of Agriculture. Molecular phylogenetic studies that include Silene and allied genera have been conducted by researchers at institutions like the Max Planck Society and the Royal Society, situating the species within clades discussed in journals such as those published by the American Society of Plant Taxonomists and the Botanical Society of America. Nomenclatural data and type specimens are cited in repositories including the International Plant Names Index and the collections of the Harvard University Herbaria.

Distribution and Habitat

Endemic to the island of Hawaiʻi, populations are restricted to high-elevation zones on volcanic slopes including Mauna Kea and Mauna Loa, occurring in alpine and subalpine shrubland, cinder deserts, and rocky outcrops. Its habitat descriptions appear in environmental assessments by the Hawaiʻi Volcanoes National Park management plans and reports from the United States Geological Survey. Elevation ranges and microhabitat specificity have been documented by field teams affiliated with the National Tropical Botanical Garden and the University of California, Berkeley herbarium expeditions.

Ecology and Life History

Silene hawaiiensis is adapted to harsh, high-elevation conditions with physiological and life-history traits studied in comparative work by researchers at the Scripps Institution of Oceanography and the Cold Spring Harbor Laboratory for alpine plant responses. Flowering phenology, seed production, and possible pollinator relationships have been observed in situ by ecologists from the Hawaiʻi Institute of Marine Biology and collaborators at the Royal Society for the Protection of Birds in broader island contexts. Seed dispersal mechanisms and germination ecology align with studies of endemic Hawaiian flora published through partnerships with the Nature Conservancy and the Smithsonian Tropical Research Institute.

Threats and Conservation

The species faces threats from habitat degradation due to introduced ungulates, trampling by visitors, invasive plant species, and the impacts of climate change documented by researchers at NOAA and climate programs at the Intergovernmental Panel on Climate Change. Federal and state conservation measures include listings and recovery planning involving the United States Fish and Wildlife Service, the Hawaiʻi Department of Forestry and Wildlife, and community groups such as the Kamehameha Schools environmental initiatives. Conservation actions have involved fencing, invasive species control, seed banking with organizations like the Millennium Seed Bank Partnership and research collaborations with the Royal Botanic Garden Edinburgh to inform adaptive management in accordance with guidelines from the IUCN.

Cultivation and Uses

Silene hawaiiensis has limited cultivation outside its native habitat and is primarily maintained in ex situ conservation collections at institutions including the Bishop Museum and botanical gardens such as the National Tropical Botanical Garden and the Chicago Botanic Garden. Propagation work informs restoration projects conducted by partnerships among the University of Hawaiʻi, the United States Forest Service, and local conservation non-profits. There are no widespread ornamental or commercial uses; its value is chiefly ecological and cultural, forming part of conservation education programs coordinated by entities like the Hawaiʻi Conservation Alliance and the Kīlauea Military Camp outreach efforts.

Category:Flora of Hawaii Category:Endemic flora of the United States