United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: Endemic to the Hawaiian Islands on the islands of Maui, Hawaii, (Palmer 2003; Wagner et al. 2005) and Oahu (Russell 2007).

Comments: Mesic to wet forests, 425-1830 m (Palmer 2003).

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

Estimated Number of Occurrences: 6 - 20

Comments: There are a total of at least 11 populations known (Palmer 2003; J. Lau, pers. comm. 2007; H. Oppenheimer, pers. comm. 2007 cited by Russell 2007). Three extant occurrences found on the island of Hawaii; observation records from 2004 (HBMP 2007). Also currently known from west Maui, east Maui, and Oahu (HBMP 2006a; J. Lau, pers. comm. 2007; H. Oppenheimer, Plant Extinction Prevention Program, pers. comm. 2007 cited by Russell 2007).

United States

Rounded National Status Rank: N2 - Imperiled

Rounded Global Status Rank: G2 - Imperiled

Reasons: Endemic to the islands of Maui, Hawaii, and Oahu in the Hawaiian Islands. Known from approximately 11 occurrences with a total of 45 to 200 individuals. Typical habitat is mesic to wet forest. Highly threatened by ungulates and alien plants.

Environmental Specificity: Unknown

Global Short Term Trend: Decline of 10-30%

Comments: Known declining due to numerous threats, exact percentage is unknown (HBMP 2007).

Global Long Term Trend: Unknown

Comments: Threatened by ungulates (including pigs, goats, and sheep) and alien plants. This species is highly and imminently threatened by feral pigs that adversely modify habitat and browse plants (Russell 2007). Also threatened by alien plants including Tibouchina herbacea (glory bush) and Clidemia hirta (Koster's curse) (H. Oppenheimer, pers. comm. 2007 cited by Rusell 2007). With so few known populations, reduced vigor, and stochastic extinction due to naturally occurring events such as hurricanes, are also a threat to this species (Russell 2002).

Comments: Microlepia mauiensis was published in W.H. Wagner, Contr. Univ. of Michigan Herb. 19: 63-82, 1993. Recognized by Kartesz (1999). USFWS tracks as Microlepia strigosa var. mauiensis.