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Cibotium
Hāpuʻu ʻiʻi (Cibotium menziesii)
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Pteridopsida
Order: Cyatheales
Family: Cibotiaceae
sensu Smith et al. (2006)
Genus: Cibotium
Kaulfuss (1824)
Species

See text.

Cibotium is a genus of eleven species of tropical tree fern—subject to much confusion and revision—distributed fairly narrowly in Hawaiʻi (four species, plus a hybrid, collectively known as hāpuʻu), Southeast Asia (five species), and the cloud forests of Central America and Mexico (two species). Some of the species currently listed in the literature seem to be synonyms or local-variant subspecies. Cibotium glaucum, from Hawaiʻi, is the most frequently encountered Cibotium species in the horticultural trade, together with its sibling species Cibotium chamissoi and the potentially huge Cibotium menziesii. The remaining Hawaiian Cibotium, C. nealiae, is a 1-metre (3.3 ft) dwarf variety, restricted to the island of Kauaʻi that is never seen in the horticultural trade. Precise identification of Cibotium species is difficult, although all have shiny and rather waxy fronds when viewed from above, with varying degrees of powdery-pale blush when seen from underneath. The natural habitat of Cibotium is among the dripping trees and stream gulleys of the rainforests on Hawaiʻi's windward volcanic slopes.

Pressure on Hawaiian Cibotium habitats comes from development encroaching on the forested areas, especially the more accessible lower lying areas which are commercially attractive for land clearance. A less obvious threat comes from an invasive introduced tree fern species: Cyathea cooperi (the most popular garden tree fern in the United States), which has escaped from the islands' suburban gardens and now out-competes the endemic flora. Wind-blown spores from this rapidly growing Australian import can migrate many miles into pristine Cibotium forests. This is a fairly recent phenomenon, but one which may eventually have grave consequences for the tree fern ecosystem in Hawaiʻi.

The other Cibotium species that often surface in botanical collections are Cibotium schiedei and Cibotium regale (Mexico), plus Cibotium barometz (Asia). The latter species is best known for its role in ancient medicine, and even today its hairs are a staple ingredient in ointments used in natural Chinese remedies. The medieval world was beguiled by stories that claimed C. barometz, the "Scythian lamb", was half-sheep and half vegetable.

There are no publicly accessible Cibotium collections growing outdoors in the United Kingdom - although they are sometimes glimpsed in Californian garden designs - but there are two outstanding glasshouse collections at the Royal Botanic Gardens, Kew, and at RBG Edinburgh in Scotland.

Species

References

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Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Classification System: Smith et al. 2006

Main Page
Cladus: Eukaryota
Regnum: Plantae
Divisio: Pteridophyta
Classis: Pteridopsida
Ordo: Cyatheales
Familia: Dicksoniaceae
Subfamilia: Cibotioideae
Genus: Cibotium
Species: C. arachnoideum - C. barometz - C. chamissoi - C. cumingii - C. glaucum - C. menziesii - C. nealiae - C. regale - C. schiedei

Name

Cibotium Kaulf. 1824

Synonyms


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