Overview

Distribution

Range Description

B. conjuncta is endemic to the island of Maui in the state of Hawaii. It has been found only on the island's western mountain mass, the West Maui Mountains. Known from six subpopulations, with a total population of around 2,500 individual plants.
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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Bidens conjuncta is endemic to the island of Maui, state of Hawaii. It has been found only on the island's western mountain mass, the West Maui Mountains.

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Physical Description

Type Information

Isotype for Bidens conjuncta Sherff
Catalog Number: US 1579011
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): C. N. Forbes
Year Collected: 1917
Locality: Honokahau., Maui, Hawaii, United States, Hawaiian Archipelago, Pacific Islands
  • Isotype: Sherff, E. E. 1923. Bot. Gaz. 76: 162.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
A perennial herb of wet forests and bogs. On ridges and in gulches.

Systems
  • Terrestrial
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Comments: Wet forests and bogs. On ridges and in gulches.

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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 - 20

Comments: 11 extant (1990-1998) occurrences on the island of Maui.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2003
  • Needs updating

Assessor/s
Bruegmann, M.M. & Caraway, V.

Reviewer/s
Maunder, M. (Plant Conservation Committee) & Dickinson, T. (Red List Programme Office)

Contributor/s

Justification
B. conjuncta is known from six subpopulations, restricted to the montane bogs of West Maui.
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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: Bidens conjuncta is endemic to the island of Maui in the state of Hawaii. It has been found only on the island's western mountain mass, the West Maui Mountains. About 2200 plants have been estimated in the 11 current occurrences. The species is threatened by feral pigs and invasive alien plants.

Environmental Specificity: Very narrow to moderate.

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Current Listing Status Summary

Status: Endangered
Date Listed: 06/27/2013
Lead Region:   Pacific Region (Region 1) 
Where Listed:


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

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Population

Population Trend
Decreasing
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Global Short Term Trend: Decline of 10-30%

Comments: Although the overall range of the species has not changed, the number of remaining individuals has declined over the last decade or so (Russell 2002).

Global Long Term Trend: Unknown

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Threats

Major Threats
The species is threatened from habitat degradation by feral pigs and invasive alien plants.
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Degree of Threat: Very high - high

Comments: The species is threatened by feral pigs that adversely modify habitat and invasive alien plants. Also, it is very likely that rats eat the fruits of this species (Russell 2002). Since the remaining plants occur in a very restricted area, extinction from naturally occurring events is also a major threat (Russell 2002).

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Management

Conservation Actions

Conservation Actions
Listed as a Candidate species with the U.S. Fish and Wildlife Service.
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Wikipedia

Bidens conjuncta

The Bog Beggarticks (Bidens conjuncta) is a species of flowering plant in the family Asteraceae. It belongs to the genus Bidens, collectively called kokoʻolau or koʻokoʻolau in the Hawaiian language. It is found only on western Maui.

Its natural habitat are wet forests and bogs. It is threatened by habitat loss due to the spread of invasive weeds and brushfires.

References


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Names and Taxonomy

Taxonomy

Comments: Genus cosmopolitan, species endemic to West Maui.

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