Regularity: Regularly occurring
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.
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.
Comments: Wet forests and bogs. On ridges and in gulches.
Habitat and Ecology
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.
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
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.
IUCN Red List Assessment
Red List Category
Red List Criteria
Date Listed: 06/27/2013
Lead Region: Pacific Region (Region 1)
For most current information and documents related to the conservation status and management of Bidens conjuncta, see its USFWS Species Profile
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
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).
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.
- Bruegmann, M.M. & Caraway, V. (2003). Bidens conjuncta. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 20 July 2007.
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Names and Taxonomy
Comments: Genus cosmopolitan, species endemic to West Maui.
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