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Cretan Date Palm

Phoenix theophrasti Greuter

Biology

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The Cretan date palm is dioecious (6), with male and female flowers on separate plants (8). Pollination may be by wind, although this has not been studied in detail (2). The yellowish-brown fruit produced is around 1.5 centimetres long and contains a single large seed (8).
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Conservation

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The largest subpopulation on Crete is protected under Greek law (1).
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Description

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Native to the eastern Mediterranean, the Cretan date palm is one of only two palm species endemic to Europe (4). This palm has a stem measuring up to 35 centimetres across (2), and a dense crown of long, spiky leaves, which become a striking silvery blue-green colour once mature (3) (5). These pinnate leaves can reach an impressive two to four metres in length (6), and have numerous forward-pointing leaflets 15 to 20 centimetres long on either side of the central stem (7) (8). The leaf stalks are heavily armed with long, yellow spines that are modified leaflets (2) (6), and when in bloom a mass of pale cream-coloured flowers emerge from among the leaf bases (6).
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Habitat

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The Cretan data palm prefers to grow in the damp sandy beds of valleys and temporary streams, but it can also be found on rocky ground. It tends to grow fairly close to the sea, and does not occur above an altitude of 250 metres (1) (4).
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Range

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Eight subpopulations are found on the Greek Island of Crete, with the largest containing a few thousand individuals, and four subpopulations occur along the southwest coast of Turkey (1).
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Status

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Classified as Lower Risk / Near Threatened (LR/nt) on the IUCN Red List 2007 (1).
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Threats

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Evidence indicates that some populations of the Cretan date palm have substantially decreased or disappeared altogether. In the past, this palm was affected by the clearance of land for cultivation, but today, the greatest threats arise from tourism development. Even if the palm populations are not cleared for construction, they can be affected by the associated increased exploitation of underground water (4).
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Phoenix theophrasti

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Phoenix theophrasti, the Cretan date palm, is a palm native to the eastern Mediterranean, in Greece and Turkey. It and Chamaerops humilis (the European fan palm) are the only native palm trees in continental Europe; areas forested with these species constitute Europe's only palm forests.[2] Similarly in Turkey, it is the only native palm species; all other species—although much more common—are introduced.[3]

Taxonomy

The specific epithet theophrasti was chosen by the Swiss botanist Werner Greuter in 1967 for the fact that Theophrastus, the ancient Greek "father of botany", had described several types of palms, including one from Crete.[3][4]

A genomic study from New York University Abu Dhabi Center for Genomics and Systems Biology showed that domesticated date palm (Phoenix dactylifera) varieties from North Africa, including well-known varieties such as Medjool and Deglet Noor, are a hybrid between Middle East date palms and P. theophrasti.[5]

Description

Apart from the usually inedible dates and upright fruit clusters, the Cretan species can appear quite similar to the cultivated date.[4]

Phoenix theophrasti grows up to 15 m tall, usually with several slender stems. The leaves are pinnate, 2–3 m long, with numerous rigid greyish-green linear leaflets 15–50 cm long on each side of the central rachis. Dead leaves are marcescent, remaining attached to the stem for years after withering.[3] The fruit is an oval yellowish-brown drupe 1.5 cm long and 1 cm diameter and containing a single large seed. The fruit pulp is too thin and fibrous to be of agricultural significance and has an acrid taste, though the fruits are sometimes eaten by the locals.

Distribution

The species has a relatively restricted distribution, mostly confined to southern Greece (a few sites on Crete and nearby islands), as well as some places on the Turkish coast.

Greece

Sites on Crete include Vai in the Lasithi Prefecture, Ayios Nikitas in Heraklion Prefecture, and Preveli gorge and Souda near Plakias, both on the south coasts of Crete in Rethymnon Prefecture. Trees are also found on Amorgos island, on Halki Island,[6] and on the south coast of Anafi island. Recently, around 10 trees, the only natural stand on the mainland, were found in an ancient palm forest in the Epidaurus area in Peloponnese. It has been proposed that its range was much more widespread in Ancient Greece, growing from Crete to Thebes and from the Peloponnese to Delos.

Turkey

Its presence in Turkey was not described scientifically until the 1980s.[3] There are four stands in southwest Turkey,[7] especially on the Datça and Bodrum Peninsulas in Muğla Province and in Kumluca-Karaöz in Finike Bay. The plants form a grove in the village of Gölköy in northern Bodrum are considered by some as a subspecies, having a shorter stem (4–8 m) but longer fruit stalks (.6–2 m).[4]

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References and external links

  1. ^ Johnson, D. (1998). "Phoenix theophrasti". IUCN Red List of Threatened Species. 1998: e.T38630A10140653. doi:10.2305/IUCN.UK.1998.RLTS.T38630A10140653.en.
  2. ^ Johnson, D.V.; Group, I.S.P.S. (1996). Palms: Their Conservation and Sustained Utilization: Status Survey and Conservation Action Plan. IUCN. ISBN 9782831703527.
  3. ^ a b c d Hazir, A.; H. D. Buyukozturk (2013). "Phoenix spp. and other ornamental palms in Turkey: The threat from red palm weevil and red palm scale insects". Emirates Journal of Food and Agriculture. 25 (11): 843. doi:10.9755/ejfa.v25i11.16500.
  4. ^ a b c Boydak, Melih; Sasha Barrow (1995). "A New Locality for Phoenix in Turkey: Gölköy-Bödrum" (PDF). Principes. 39 (3): 117–122.
  5. ^ Flowers, Jonathan; et al. (2019). "Cross-species hybridization and the origin of North African date palms". Proceedings of the National Academy of Sciences USA. 116 (5): 1651–1658. doi:10.1073/pnas.1817453116. PMC 6358688. PMID 30642962.
  6. ^ Vernicos, Nicolas. "Chalki in the Dodecanese". {{cite journal}}: Cite journal requires |journal= (help)
  7. ^ "Phoenix theophrasti". ARKive. Archived from the original on 30 June 2006. Retrieved 18 May 2006.
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Phoenix theophrasti: Brief Summary

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Phoenix theophrasti, the Cretan date palm, is a palm native to the eastern Mediterranean, in Greece and Turkey. It and Chamaerops humilis (the European fan palm) are the only native palm trees in continental Europe; areas forested with these species constitute Europe's only palm forests. Similarly in Turkey, it is the only native palm species; all other species—although much more common—are introduced.

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