Pritchardiopsis jeanneneyi
| Pritchardiopsis jeanneneyi | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Pritchardiopsis | ||||||||||||
| Becc. | ||||||||||||
| Scientific name of the species | ||||||||||||
| Pritchardiopsis jeanneneyi | ||||||||||||
| Becc. |
Pritchardiopsis jeanneneyi is a species of palm endemic to New Caledonia . It is the only representative of the genus Pritchardiopsis .
features
Pritchardiopsis jeanneneyi is a moderately large, hermaphrodite fan palm . It is single-stemmed, armed and blooming several times. The trunk is upright, smooth and curled with distinct leaf scars.
The number of chromosomes is unknown.
leaves
The leaves are folded induplicate, costapalmat for short, and fall off with a smooth scar. The leaf sheath breaks up into a network of fine, rust-brown fibers. The petiole is long, flat to furrowed on top, rounded on the underside. The stalk edges are smooth at the distal end, with short, recurved spines at the base of young plants and smooth in adult plants. The adaxial hastula is short and round, the abaxial hastula is absent.
The leaf blade is stiff and regularly divided into simply folded segments up to or above the center. The segments are short bifid, lanceolate and glabrous on both sides.
Inflorescences
The inflorescences are between the leaves (interfoliar) and are branched up to four times. The axes are angular. The peduncle is very short and flattened. A cover sheet is not visible and starts above the base. Bracts on the peduncle are missing. The inflorescence axis is very short and divided into three long side axes of the first order. Each lateral axis carries a bract and two tubular bracts for lateral axes of the second order. The other lateral axes of the second order have no tubular bracts. The flower-bearing axes (rachillae) have no recognizable bracts. They are short and crowded at the end of the second-order side axes. They have rather distant wraps of three flowers in the basal area, distal the flowers stand individually.
blossoms
The flowers are sessile and have no bracts. The calyx is persistent, tubular, fused with the receptacle at the base, and at the end with three short free tips. The three petals are briefly fused together at the base, valvated and hollowed out in the shape of a hood distally. The six stamens start at the throat of the crown, have upright filaments that grow together briefly and are connected to the crown. The anthers are erect, almost spherical, arrow-shaped and intrors. The gynoeceum is spherical-three-lobed with three compartments and three ovules . The carpels are free in the fertile area in the grip diaper area overgrown. The style is slender, short, awl-shaped with a point-like scar . The ovule is basal and anatropic.
The pollen is ellipsoidal, sometimes slightly asymmetrical. The germ opening is a distal sulcus. The longest axis measures 23 to 24 microns.
Fruits and seeds
The fruit is large, single-seeded, spherical and has apical remains of scars. The exocarp is smooth and purple, the mesocarp is fleshy to fibrous. The endocarp is woody, rounded on one side and a keel on the opposite side. At the side it is elongated, towards the base it is narrowed. The seed is spherical, upright, has a basal umbilicus (hilum). The raphe is circular. The endosperm is homogeneous and indented at the base by a deep indentation in the seed coat.
Distribution and locations
The genus is endemic to New Caledonia . It occurs only in the southeast of the island on steep slopes over serpentine rock, at around 200 m above sea level near the Bay of Prony. It was thought to be extinct for a while until three very small populations were discovered again.
Systematics
The genus Pritchardiopsis is within the family Arecaceae in the subfamily coryphoideae , tribe Trachycarpeae , subtribe Livistoninae provided. The genus is monotypical with the only representative Pritchardiopsis jeanneneyi . Pritchardiopsis is possibly the sister group of a group made up of Johannesteijsmannia and Pholidocarpus .
Pritchardiopsis was first described by Odoardo Beccari in 1910 , the type species is the Pritchardiopsis jeanneneyi described at the same time . The generic name is derived from the generic name Pritchardia and the ending opsis for "similar".
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. 270-272.
Individual evidence
- ↑ Pritchardiopsis in the World Checklist of Selected Plant Families , accessed March 11, 2012.
Web links
- Saribus jeanneneyi inthe IUCN 2013 Red List of Threatened Species . Listed by: Jaffré, T., 1998. Retrieved December 24, 2013.