Crossword Genius

Torch thistles, e.g.

Ross

I believe the answer is:

cacti

(Other definitions for cacti that I've seen before include "Features of westerns" , "tuna, for example" , "Plants native to arid regions" , "Spiky desert plants in plural" , "Spiny succulents" .)

I've seen this clue in The New York Times.
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