Petrobium
Encyclopedia
Petrobium is a monotypic genus
in the family Asteraceae
endemic to the island of Saint Helena
in the South Atlantic Ocean. The vernacular name is Whitewood.
Petrobium arboreum R.Br.
(Saint Helena Whitewood) is found in the tree-fern thicket at the top of the central ridge of Saint Helena. Individuals are either female or hermaphrodite, i.e. the species is gynodioecious
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Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
in the family Asteraceae
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
endemic to the island of Saint Helena
Saint Helena
Saint Helena , named after St Helena of Constantinople, is an island of volcanic origin in the South Atlantic Ocean. It is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha which also includes Ascension Island and the islands of Tristan da Cunha...
in the South Atlantic Ocean. The vernacular name is Whitewood.
Petrobium arboreum R.Br.
Robert Brown (botanist)
Robert Brown was a Scottish botanist and palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope...
(Saint Helena Whitewood) is found in the tree-fern thicket at the top of the central ridge of Saint Helena. Individuals are either female or hermaphrodite, i.e. the species is gynodioecious
Plant sexuality
Plant sexuality covers the wide variety of sexual reproduction systems found across the plant kingdom. This article describes morphological aspects of sexual reproduction of plants....
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