Dubautia hanaulaensis B. G. Baldwin

Shrubs, often compact, much-branched, mostly 2-10 dm tall, leaves opposite.  Diagnostic features of the species include 1) opposite, nearly glabrous to sparsely glandular, mostly linear to narrowly elliptic-oblanceolate leaves with margins 1-4 toothed on each side distally, 2) capitulescences 2-8.5+ x 2-7 cm, bearing 7-45+ heads, and 3) false involucral bracts sparsely to moderately minutely glandular with sessile glands.  Most flowering specimens have been collected from August to November.

Dubautia hanaulaensis is known only from southern West Maui, in mesic shrubland and forest ranging from 850-1100 m in elevation. Annual precipitation at sites occupied by the species range from about 80 to 120 cm.

This species is very similar to D. carrii, differing primarily in its smaller stature, slightly narrower, usually more nearly linear leaves, and smaller capitulescences with fewer heads, the false involucres of which are sparsely to moderately minutely glandular with mostly or exclusively sessile glands.  

Recognition of D. hanaulaensis and D. carrii as separate species is supported by molecular data that place them in different clades, and together with biogeographic evidence, suggest that their similarities are due to retained ancestral or plesiomorphic traits present in their most recent common ancestor.

Last Modification: March 14, 2011

Each "thumbnail" image below is linked to a larger photograph.  All images Gerald D. Carr unless otherwise noted.


Pohakea Gulch, S of Hana'ula, W Maui [ Hank Oppenheimer]
SW rim of Pohakea Gulch, S of Hana'ula, 1005 m elev., W Maui
SW rim of Pohakea Gulch, S of Hana'ula, 1005 m elev., W Maui
SW rim of Pohakea Gulch, S of Hana'ula, 1005 m elev., W Maui
SW rim of Pohakea Gulch, S of Hana'ula, 1005 m elev., W Maui

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