Nesohedyotis
Nesohedyotis is a genus of flowering plants endemic to the island of Saint Helena in the South Atlantic Ocean. It in the family Rubiaceae (the family that includes coffee).
| St Helena dogwood | |
|---|---|
_p371_-_PLATE_35_-_Hedyotis_Arborea.jpg.webp) | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Gentianales |
| Family: | Rubiaceae |
| Subfamily: | Rubioideae |
| Tribe: | Spermacoceae |
| Genus: | Nesohedyotis (Hook.f.) Bremek. |
| Species: | N. arborea |
| Binomial name | |
| Nesohedyotis arborea (Roxb.) Bremek. | |
It is a monotypic genus containing the single species Nesohedyotis arborea (Roxb.) Bremek., which grows on the central ridge of the island. It is known commonly as the St. Helena dogwood.[1] The vernacular name recalls the similarity between its inflorescences and those of Cornus species, the dogwoods of Europe and North America.[2] Although it is one of the commoner endemic species on Saint Helena its small population size and small geographical distribution make it endangered.
This species is a small, erect tree growing up to 7 meters tall. The leaves are oppositely arranged. They are lance-shaped with a pointed, downcurved "drip tip". The white flowers are 3 or 4 millimeters wide and the fruit is a brown or black capsule.[2]
This tree is a keystone species in the thickets of the island. The leaves collect mist, which condenses and falls from the "drip tips" into the vegetation below, providing water.[2]
See also
References
- Cairns-Wicks, R. 2003. Nesohedyotis arborea. The IUCN Red List of Threatened Species 2003. Downloaded on 24 November 2015.
- Percy, D. M., & Cronk, Q. C. B. (1997). Conservation in relation to mating system in Nesohedyotis arborea (Rubiaceae), a rare endemic tree from St Helena. Biological Conservation, 80(2), 135-145.
Further reading
- Cronk, Q.C.B. (1995). The Endemic Flora of St Helena. Anthony Nelson Ltd., Oswestry.