Juania australis
| Juania australis | ||||||||||||
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Juania australis |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Juania | ||||||||||||
| Drude | ||||||||||||
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| Juania australis | ||||||||||||
| ( Mart. ) Drude |
Juania australis is a species of palm nativeto the Juan Fernández Islands off the coast of Chile . It is the only member of the genus Juania .
features
Juania australis is similar to the related genera Ceroxylon and Oraniopsis , but differs from them by the following combination of features: The cover leaf on the inflorescence is complete, the petals are free, the number of stamens is always six, the remnants of stigmas on the fruit are always eccentric and subapical.
They are diocesan , pinnate-leaved palms. They stand individually, are of moderate size, unarmed and bloom several times. The trunks are a bit compact, the leaf scars are sloping. The internodes get shorter from the middle of the height, in the crown area they are very short. Their surface is green and very smooth. The leaves are pinnate, the segments are reduplicate folded (Λ-shaped). They are initially vertical, later they protrude to the side. The leaf sheaths are fibrous, tear open opposite the petiole and do not form a crown shaft.
The inflorescences stand individually between the leaves, usually two are formed per year. They are twofold. The flowers are white and stand individually on the axes. The fruit is spherical, orange-red when ripe with a smooth exocarp , a juicy and orange mesocarp . This has a few, flat, lengthways, unbranched, whitish fibers on the inside. The endocarp is very thin and cartilaginous and lies against the semen.
The number of chromosomes is unknown.
Distribution and locations
Juania australis is on the Juan Fernández Islands endemic . It grows here on steep slopes and ridges of the deeper and higher mountain forest at heights of 200 to 800 m, with a focus above 800 m. The species is endangered in its natural habitat by introduced goats. Because the species is difficult to cultivate, it is rare in both the wild and in culture.
Systematics
Juania is classified within the family in the subfamily Ceroxyloideae , tribe Ceroxyleae . The genus is monotypical, it consists of the only species Juania australis . Her sister group is Ceroxylon .
In the World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew , only the species Juania australis is recognized.
The genus name is derived from the Juan Fernández Islands, the home of the genus.
supporting documents
- John Dransfield, Natalie W. Uhl, Conny B. Asmussen, William J. Baker, Madeline M. Harley, Carl E. Lewis: Genera Palmarum. The Evolution and Classification of Palms . Second edition, Royal Botanic Gardens, Kew 2008, ISBN 978-1-84246-182-2 , pp. 339-341.
Individual evidence
- ↑ Rafaël Govaerts (ed.): Juania. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 4, 2011.
Web links
- Juania on the homepage of the Fairchild Tropical Botanic Garden
- Juania australis inthe IUCN 2013 Red List of Threatened Species . Listed by: World Conservation Monitoring Center, 1998. Retrieved December 24, 2013.