Rheum palaestinum

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Desert rhubarb
Rheum palaestinum 4.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Rheum
Species:
R. palaestinum
Binomial name
Rheum palaestinum

Rheum palaestinum, the desert rhubarb, is a plant indigenous to Israel and Jordan with a highly developed system for gathering rainwater. [1] [2]

The plant has broad, rigid leaves, with a waxy surface, and channels cut into them that funnel any water that drops onto them toward its root, with enough force to cause deep soil penetration. [3] An alternative explanation for the evolution of the unique morphology of the rheum's leaf is that the wrinkled leaf has specifically developed its unique "architecture" as a vapor-trap, tightly capping the ground to harvest water by sub-foliar condensation of vapor rising from the earth. [4]

It has been added to Israel's Red List of Rare and Endangered Plants, and is protected in that country by law. In Israel it only occurs in 32 locations in the inaccessible highlands of the western central Negev Desert, in populations numbering from a handful to hundreds. [5] It furthermore also grows in southern Jordan and the mountains of northern Saudi Arabia. [5] [6]

It grows in rocky ground, on cliffs and amongst desert rocks, usually above 850m, and is generally associated with the plant species Artemisia sieberi . [5]

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Rheum ribes, the Syrian rhubarb or currant-fruited rhubarb, or warty-leaved rhubarb, is an edible wild rhubarb species in the genus Rheum. It grows between 1000 and 4000 m on dunite rocks, among stones and slopes, and is now distributed in the temperate and subtropical regions of the world, chiefly in Western Asia to Afghanistan and Pakistan and also in ladakh(Kargil) region of India. The Syrian rhubarb is a partially commercial vegetable collected from wild patches in Eastern and Southern Anatolia, Northern Iraq and partly Northwestern Iran in early spring. Rheum ribes is considered as a valuable medicinal species in herbal medicine.

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Rheum rhaponticum, the false rhubarb, rhapontic rhubarb or rhapontic, is a plant species in the genus Rheum found in the wild. It is the only Rheum species found only in Europe, and is now restricted to the Rila mountain range in south-western Bulgaria. It was introduced to other countries in Europe. It is considered to be one of the parents of the modern culinary rhubarb.

<i>Colchicum ritchii</i> Species of plant

Colchicum ritchii, or the Egyptian autumn crocus, is a plant species native to the southeastern Mediterranean east to the Arabian Peninsula.

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The wildlife of Saudi Arabia is substantial and varied. Saudi Arabia is a very large country forming the biggest part of the Arabian Peninsula. It has several geographic regions, each with a diversity of plants and animals adapted to their own particular habitats. The country has several extensive mountain ranges, deserts, highlands, steppes, hills, wadis, volcanic areas, lakes and over 1300 islands. The Saudi Arabian coastline has a combined length of 2,640 km (1,640 mi) and consists of the Gulf of Aqaba and the Red Sea to the west while a shorter eastern coastline can be found along the Persian Gulf.

References

  1. "In Israel, a desert plant waters itself".
  2. "Israeli researchers decipher self-watering mechanism of desert rhubarb". Archived from the original on April 23, 2010.
  3. Lev-Yadun, S.; Katzir, G.; Ne`eman, G. (Mar 2009). "Rheum palaestinum (desert rhubarb), a self-irrigating desert plant". Naturwissenschaften. 96 (3): 393–397. doi:10.1007/s00114-008-0472-y. PMID   19030840.
  4. Khammash, Ammar (14 July 2016). "A three-dimensional study of sub-foliar condensation in desert rhubarb (Rheum palaestinum, Polygonaceae)" (PDF). Plant Ecology and Evolution. 149 (2): 137–143. doi: 10.5091/plecevo.2016.1174 .
  5. 1 2 3 Shmida, Avi; Pollak, Gadi; Fragman-Sapir, Ori (2011). "Endangered Plants of Israel Rheum palaestinum". Israel Nature and Parks Authority. Retrieved 13 March 2019.
  6. Thomas, Jacob (7 August 2017). "Flora of Saudi Arabia, checklist". King Saud University. Retrieved 13 March 2019.