Azorella macquariensis
Azorella macquariensis
 Azorella macquariensis cushion plant on Macquarie Island. | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Apiales |
| Family: | Araliaceae |
| Genus: | Azorella |
| Species: | A. macquariensis |
| Binomial name | |
| Azorella macquariensis Orchard[1] | |
| Synonyms | |
|
Azorella selago | |
Azorella macquariensis, also known as Macquarie Azorella or Macquarie Cushions, is a species of cushion plant endemic to Australia’s subantarctic Macquarie Island. It was referred to the more widely distributed A. selago until 1989, when it was described as a separate species.[2]
Description
Azorella macquariensis is a perennial cushion-forming herb. Individuals form cushions and mats that may vary in size from a few centimetres to several metres in diameter and up to 60 cm in height. It is a keystone species dominating Macquarie's feldmark habitat, in which it is the only vascular plant, forming a major structural component of the vegetation. The feldmark community covers about half the island in the most wind-exposed areas of the plateau some 200–400 m above sea level. The plant flowers from December to February and fruits from January to April. It turns brown and ceases to grow during winter (from June to August).[2]
Conservation status
Azorella macquariensis has suffered a catastrophic decline due to dieback from unknown causes, first noticed in December 2008, and is considered to be endangered.[2]
References
Notes
Sources
- Orchard, A.E. (1989). "Azorella Lamarek (Hydrocotylaceae) on Heard and Macquarie Islands.". Muelleria 7: 16–18.
- "Azorella macquariensis – Macquarie cushions" (PDF). Tasmanian Threatened Species Notesheet. Department of Primary Industries and Water, Tasmania. 2009. Retrieved 2010-09-22.