Self-Irrigating water efficient Desert Plant

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As seen here, the desert rhubarb (Rheum palaestinum) of Israel and Jordan is a desert plant is noted as "Self-irrigating" because of its extreme efficiency in being able to gather water and channel it towards its roots.  In perspective, all plants in their natural enviroment are "self-irrgating" since many of the worlds natural plants do not have the luxury of humans or other spicies to water them. 

In the Pacific Islands, althought much of the lush vegitation grows in a tropical climate with high rain fall, many leeward and coastal plants have also adapted to limited rainfall and extreme conditions.  Lau Fala, in Samoa (Pandanus tectorius) is a common plant throught the pacific that is a perfect example of efficient adaptation.  The  plant most grows near the coasts has adapted to high or limited rainfall, variety of soils including some with sand or lava rock cliffs, as well as the harsh salt air and winds from the ocean surface.  The Pacific Islanders have used the plant for food, weaving, mats, jewlery, and even as