Mimosa tree, e.g. (6)

I believe the answer is:

acacia

(Other definitions for acacia that I've seen before include "Tropical tree, inc. mimosa, wattle" , "Spiny tree or shrub" , "Wattle genus" , "Thorny shrub with yellow or white-flowers" , "Flowering shrub of the pea family" .)

I've seen this clue in the King Feature Syndicate.

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