Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Localities documented in Tropicos sources

Silene alexandri Hillebr.:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Global Range: Current range: central Molokai; historically no additional range.

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Historic Range:
U.S.A. (HI)

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Ecology

Habitat

Comments: Moist shrublands on steep rocky slopes.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 1 - 5

Comments: 1 current (between 1982 and 1997) and 1 historical occurrence.

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Conservation

Conservation Status

Current Listing Status Summary

Status: Endangered
Date Listed: 10/08/1992
Lead Region:   Pacific Region (Region 1) 
Where Listed:


Population detail:

Listing status: E

For most current information and documents related to the conservation status and management of Silene alexandri, see its USFWS Species Profile

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National NatureServe Conservation Status

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G1 - Critically Imperiled

Reasons: This species is endemic to the island of Molokai. It has been recorded from only 3 locations, all within a 4 km stretch. Only 2 of these populations are known to be extant, with a total of fewer than 50 plants. The species is threatened by feral goats and pigs, alien plants, and the possibility of fire.

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Threats

Comments: Threats include fire, alien vegetation and feral ungulates.

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Management

Biological Research Needs: Population biology and ecology.

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Wikipedia

Silene alexandri

Silene alexandri is a rare species of flowering plant in the pink family known by the common names Kamalo Gulch catchfly and Alexander's catchfly. It is endemic to Hawaii, where it is known only from the island of Molokai. It is threatened by the degradation of its habitat and it is a federally listed endangered species of the United States.[1]

This subshrub grows 30 to 60 centimeters tall and bears white flowers.[1] It grows in moist lowland shrubland on the sides of steep basalt cliffs.[2] The plant has only been seen on a four-kilometer-long stretch of the island of Molokai.[1] Today only one small population of six plants is thought to remain.[2]

This plant is threatened by invasive species of introduced plants in its habitat, including lantana (Lantana camara), molasses grass (Melinis minutiflora), and Natal grass (Rhyncelytrum repens). The habitat is degraded by feral goats. Also, the species faces the loss of reproductive vigor because so few individuals remain in the breeding pool.[2]

References[edit]

  1. ^ a b c Silene alexandri. The Nature Conservancy.
  2. ^ a b c USFWS. Silene alexandri Five-year Review. January 2008.
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Names and Taxonomy

Taxonomy

Comments: GENUS WIDELY DISTRIBUTED IN NORTH TEMPERATE REGIONS, ESPECIALLY MEDITERRANEAN REGION. SPECIES ENDEMIC TO MOLOKAI.

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