Metrosideros rugosa

Metrosideros rugosa
	Lehua papa tree
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Myrtales
Family:	Myrtaceae
Genus:	Metrosideros
Species:	M. rugosa
Binomial name
	Metrosideros rugosa; A.Gray

Metrosideros rugosa, the lehua papa, is a tree of the myrtle family which is endemic to the island of Oʻahu in the Hawaiian Islands.[1][2]

M. rugosa leaves showing the indented veins.

It is closely related to the widespread and highly variable ʻōhiʻa lehua (Metrosideros polymorpha), found throughout the islands. Lehua papa, however, is restricted to a narrow habitat range at the summits of very wet, windswept ridges and cliffs in the Koʻolau mountains.

It is distinguished from M. polymorpha by having the upper surface of the leaves with the veins deeply indented, and the leaf margins partly rolled (the latter is also found in some M. polymorpha varieties). It is also of rather distinctive appearance, with a compact shape suited to its windy habitats. Metrosideros rugosa has red flowers.

References

Aradhya, K. M.; Mueller-Dombois, D.; Ranker, T. A. (October 1991). "Genetic evidence for recent and incipient speciation in the evolution of Hawaiian Metrosideros (Myrtaceae)". Heredity. 67 (2): 129–138. doi:10.1038/hdy.1991.72. ISSN 1365-2540.
Rock, Joseph Francis (1913). The Indigenous Trees of the Hawaiian Islands. T. H. pp. 334–335.

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[1] Aradhya, K. M.; Mueller-Dombois, D.; Ranker, T. A. (October 1991). "Genetic evidence for recent and incipient speciation in the evolution of Hawaiian Metrosideros (Myrtaceae)". Heredity. 67 (2): 129–138. doi:10.1038/hdy.1991.72. ISSN 1365-2540.

[2] Rock, Joseph Francis (1913). The Indigenous Trees of the Hawaiian Islands. T. H. pp. 334–335.