Rheum palaestinum

Desert rhubarb
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Core eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Rheum
Species:	R. palaestinum
Binomial name
Rheum palaestinum Feinbrun

Rheum palaestinum, the desert rhubarb, is a plant indigenous to Israel and Jordan, with the most highly efficient water gathering capabilities known in botany.^[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.

References

1. "In Israel, a desert plant waters itself".
2. "Israeli researchers decipher self-watering mechanism of desert rhubarb".