The Joshua tree is a member of this genus (5)

I believe the answer is:

yucca

(Other definitions for yucca that I've seen before include "Evergreen plant with thick stout stems" , "House plant with spiky flowers" , "Evergreen N American shrub" , "Garden plant from Mexico" , "The Joshua Tree'" .)

I've seen this clue in The Times and The Sunday Times.

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