Androstoma is a small genus of two flowering shrub species in the family Ericaceae (the heath family), order Ericales. The genus was described by the botanist Joseph Dalton Hooker in 1844 in The Botany of the Antarctic Voyage, based on material collected from Lord Auckland's Group and Campbell's Island in the sub-Antarctic. Its native range spans New Zealand and Tasmania, making it part of the distinctive Australasian heath flora.
The genus belongs to the tribe Styphelieae within Ericaceae, allied to the Cyathodes group — a lineage of small-leaved, heath-like shrubs characteristic of open, often subalpine or montane habitats in the southern hemisphere. The two recognised species are Androstoma empetrifolia Hook.f. (the type species) and Androstoma verticillata (Hook.f.) Quinn. In New Zealand, the genus is represented by one indigenous endemic species.
Etymology
The genus name Androstoma was coined by Joseph Dalton Hooker in 1844. No published etymology is provided in the protologue; the name combines Greek roots (andr-, male/stamen, and stoma, mouth or opening), likely alluding to a characteristic of the flower's stamen arrangement, consistent with Hooker's naming conventions for Ericaceous genera of the period.
Distribution
Androstoma is native to New Zealand and Tasmania. In New Zealand it has indigenous (non-endemic) status at the genus level, with one species (Androstoma empetrifolia) considered endemic to the country. The genus is part of the Australasian component of the tribe Styphelieae, which is concentrated in the southern hemisphere.
Taxonomy Notes
The genus was placed within the Cyathodes group of tribe Styphelieae (Ericaceae) by Quinn, Brown, Heslewood & Crayn (2005, Australian Systematic Botany 18: 439–454), which revised generic concepts in that group. Androstoma verticillata was transferred to the genus from Cyathodes by Quinn. GBIF records an authorship of "Hook.f." as a synonym entry alongside the accepted genus record, reflecting the complex synonymic history of Styphelieae genera.
