Nephrosperma van-houtteanum
| Nephrosperma van-houtteanum | ||||||||||||
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Nephrosperma van-houtteanum |
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| Nephrosperm | ||||||||||||
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| Scientific name of the species | ||||||||||||
| Nephrosperma van-houtteanum | ||||||||||||
| ( H. Wendl. Ex Van Houtte) Balf.f. |
Nephrosperma van-houtteanum is a palm species endemic to the Seychelles . It is the only species in the genus Nephrosperma .
features
Nephrosperma van-houtteanum is a medium-sized, single -stemmed palm. Young specimens are armed, in old age they are more or less unarmed. They are single sexed ( monoecious ) and bloom several times. The trunk is erect, unarmed and covered with conspicuous, ring-shaped leaf scars .
The chromosome number is 2n = 32.
leaves
The leaves are pinnate. The leaf sheath is tubular, later open, the leaf sheaths do not form a clear crown shaft. They are densely hairy and have numerous black spines when they are young; when they are older they are almost unarmed. The edge of the leaf sheaths is irregularly ligule- like. The petiole is clearly developed and has white hairs and scattered scales. The rachis is curved. The leaf leaflets are regularly arranged, curved and folded two or three times. They are pointed to pointed, bald on top, covered with numerous point-shaped scales and hairs on the underside. Growing leaves are colored red.
Inflorescences
The inflorescences stand individually between the leaves (interfoliar) and are simply branched. The inflorescences are proterandric . The peduncle is very long and about half as long as or longer than the leaves. They are initially upright, later curved. The cover sheet starts near the base of the peduncle, is persistent, leathery, tubular, two-keeled, the wings are irregularly split or toothed. It is densely covered with scales and white wax and covered with short thorns and spines, rarely unarmed. The bract on the peduncle starts a little away from the cover sheet, is elongated, with a conspicuous long beak. It is initially piping, but tears lengthways and falls off later.
The inflorescence axis is shorter than the stem and carries the flower-bearing side axes (rachillae) in a helical arrangement. The bracts on the inflorescence axis are very small. The rachillae are scaled and have a swollen, flower-free area at the base. They are very long, protruding and slim. They carry the flower triads at intervals in a helical arrangement. Only at the top are the flowers singly or in pairs.
blossoms
The male flowers are symmetrical. The three sepals are separate and imbricat , they are rounded and keeled. The three petals are around three to four times as long as the sepals; they stand separately and are valvat , as well as boat-shaped. The approximately 40 to 50 stamens have long stamens and very small anthers . These are plump, have broad connective, and are latrors. The rudiment of the stamp is egg-shaped and clearly formed.
The female flowers are spherical. The three sepals are separate and imbrickant, rounded, thick and tend to tear open irregularly. The three petals are separate, imbrickat, rounded, with short, triangular, valvate tips. The six staminodes are small and tooth-shaped. The gynoeceum is inverted-pear-shaped and has a fan with an ovule . The scars are small and apical.
fruit
The fruit is rather small, spherical to slightly kidney-shaped and red. The flower shell is retained, the remains of the stigma are to the side. The exocarp is shiny, smooth, the mesocarp is thin, fleshy and has a layer of fibers inside. The endocarp is very thin and cartilaginous. The seed is spherical to kidney-shaped and attaches laterally near the base. It has a long hilum, the raphen branches are separated and are easily inserted into the endosperm . The latter is deeply furrowed (ruminat).
Distribution and locations
Nephrosperma van-houtteanum is only found in the Seychelles . It is a type of lowland and does not occur above 500 m above sea level. It grows on rocky slopes, but is also found in some secondary forests. It is widely used as an ornamental plant.
Systematics
The genus Nephrosperma is placed within the family Arecaceae in the subfamily Arecoideae , Tribus Areceae and Subtribus Verschaffeltiinae . Its sister genus is Phoenicophorium .
In the World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew , only the species Nephrosperma van-houtteanum is recognized.
The name is made up of the Greek words nephros for kidney and sperma for semen and relates to the shape of the semen. The species name van-houtteanum was chosen in honor of the Belgian botanist and horticultural owner Louis van Houtte .
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. 611-613.
Individual evidence
Web links
- Nephrosperma on the homepage of the Fairchild Tropical Botanic Garden
- Nephrosperma van-houtteanum on the PACSOA homepage
- Nephrosperma van-houtteanum in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Ismail, S., Huber, MJ & Mougal, J., 2007. Retrieved December 24, 2013.
Individual evidence
- ↑ a b Rafaël Govaerts (Ed.): Nephrosperma. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved October 16, 2010.