| 词条 | Nesohedyotis |
| 释义 |
|image = MELLISS(1875) p371 - PLATE 35 - Hedyotis Arborea.jpg |name = St Helena dogwood |status = CR |status_system = IUCN3.1 |extinct = 2003 |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Gentianales |familia = Rubiaceae |genus = Nesohedyotis |genus_authority = Bremek. |species = N. arborea |binomial = Nesohedyotis arborea }} 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). 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
References1. ^Cairns-Wicks, R. 2003. Nesohedyotis arborea. The IUCN Red List of Threatened Species 2003. Downloaded on 24 November 2015. 2. ^1 2 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
3 : Monotypic Rubiaceae genera|Flora of Saint Helena|Endangered plants |
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