water tree

noun

: any of several chiefly tropical plants with fluids that may be used as an emergency source of drinking water: such as

a

: a large Ceylonese pitcher plant (Nepenthes distillatoria)

b

: an African woody vein (Tetracera potatoria) that yields abundant watery sap when a large stem is cut

c

: any of several chiefly arborescent Australian plants (as of the family Proteaceae) that yield a watery sap when the bark or roots are cut

especially : a needle wood (Hakea leucoptera) that stores water in its thickened roots

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