Dubautia kalalauensis - B.G. Baldwin & G.D. Carr
Taxonomic Status: Provisionally accepted
Related ITIS Name(s): Dubautia kalalauensis B.G. Baldwin & G.D. Carr (TSN 780679)
Unique Identifier: ELEMENT_GLOBAL.2.818666
Element Code: PDAST33120
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Dubautia
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Concept Reference
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Concept Reference: Baldwin, B. G. and G. D. Carr. 2005. Dubautia kalalauensis, a new species of the Hawaiian silversword alliance (Compositae, Madiinae) from northwestern Kaua'i, U.S.A. Novon 15(2): 259 - 263.
Concept Reference Code: A05BAL01HQUS
Name Used in Concept Reference: Dubautia kalalauensis
Taxonomic Comments: Dubautia kalalauensis was described in 2005; before its description as a distinct species, this taxon had been treated within the circumscription of Dubautia laxa ssp. hirsuta. According to Baldwin and Carr (2005), this species differs from all previously described taxa of Dubautia in combining opposite leaves, eglandular peduncles, receptacular bracts throughout the heads (one per floret), greenish cream corollas, and pappi of setiform scales ca. 4 mm long. These authors also report molecular phylogenetic findings showing that D. kalalauensis is less closely related to the widespread D. laxa than to other Kaua'i endemics, including D. imbricata, D. kenwoodii, D. laevigata, D. syndetica, and D. waialealae.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 21Oct2008
Global Status Last Changed: 21Oct2008
Rounded Global Status: G1 - Critically Imperiled
Reasons: Endemic to northwestern Kauai, in the vicinity of the rim of Kalalau Valley. Formerly known from several locations below the Valley rim, the species is now found in only one location along the rim totaling 26 individuals. Threats include non-native plants, climate change, and low population numbers, which increase vulnerability to stochastic events such as hurricanes.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Hawaii (SNR)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (13Apr2010)
U.S. Fish & Wildlife Service Lead Region: R1 - Pacific

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to northwestern Kauai, in the vicinity of the rim of Kalalau Valley (Baldwin and Carr 2005).

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Currently known from only one location (USFWS 2008).

Population Size Comments: The one currently known location totals 26 individuals (USFWS 2008).

Overall Threat Impact Comments: According to the U.S. Fish and Wildlife Service (2008), this species is threatened by non-native plants and climate change. It also has very low population numbers, which increase its vulnerability to stochastic events such as hurricanes.

Long-term Trend: Decline of 30-70%
Long-term Trend Comments: Historically, this species, as a part of Dubautia laxa, was known from several locations below the rim of Kalalau Valley in Kokee State Park, in the northwestern region of Kauai. Currently, it is found in only one location along the rim of Kalalau Valley (USFWS 2008).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to northwestern Kauai, in the vicinity of the rim of Kalalau Valley (Baldwin and Carr 2005).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
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U.S. & Canada State/Province Distribution
United States HI

Range Map
No map available.

Ecology & Life History
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Basic Description: A shrub/tree in the sunflower family, Hawaiian silversword alliance (Asteraceae, Madiinae). This species has opposite leaves and greenish cream corollas (petals).
Diagnostic Characteristics: Before its description as a distinct species, this taxon had been treated within the circumscription of Dubautia laxa ssp. hirsuta. However, it differs from D. laxa ssp. hirsuta by having a more openly branching habit, softer leaf surfaces, greenish cream (rather than yellow) corollas, less glandular corolla tubes and throats, and longer pappus elements (Baldwin and Carr 2005).
Terrestrial Habitat(s): Forest - Hardwood, Forest/Woodland
Habitat Comments: Metrosideros polymorpha wet forests in the montane wet ecosystem. 1205 - 1235 m.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 21Oct2008
NatureServe Conservation Status Factors Author: Gravuer, K.

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Baldwin, B. G. and G. D. Carr. 2005. Dubautia kalalauensis, a new species of the Hawaiian silversword alliance (Compositae, Madiinae) from northwestern Kaua'i, U.S.A. Novon 15(2): 259 - 263.

  • U.S. Fish and Wildlife Service. 2008. Endangered and Threatened Wildlife and Plants; Listing 48 Species on Kauai as Endangered and Designating Critical Habitat; Proposed Rule. Federal Register 73(204): 62592-62742. 21 October 2008.

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