Metrosideros collina (J.R. Forst. & G. Forst.) A. Gray var. pumila (A. Heller) Rock, Hawaii, Board Agric. Forest. Bot. Bull. 4: 61. 1917. Flora of the Hawaiian Islands --Basionym
Type Information
Nania pumila A. Heller , Minnesota Bot. Stud. 1: 864 1897.
Kaua`i: in and near bog at the head of the Wahiawa [River]. 3000 ft. 21 August 1895. A.A. Heller 2738.
Holotype [MIN]. Isotype(s) [A!, GH [fragment BISH!], K, NY [mfc!]].

Note: Collection 2738, pro parte. Other collections distributed under Heller 2738 were made 19 October (BISH!, US!), and are not types. Rock (1917) cited "type in Gray Herbarium" and that is the sheet represented in his plate 24 (Harvard stamp faintly legible); 21 August can be read on the label. The fragment of the GH sheet at BISH has a label in Rock's handwriting and no date is given on the label.

=Metrosideros polymorpha var. pumila
*Verification: Wagner, W.L. & R.K. Shannon. 1999. Brittonia 51:422-438.
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*Verification: D.M. Mix.