Crossword Genius

Plants found in reference books (7)

Ross

I believe the answer is:

annuals

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This clue could be a double definition.

'plants found in' is the first definition.
'annuals' can be an answer for 'plants' (I've seen this before). I am unsure of the 'found in' bit.

'reference books' is the second definition.
(annual is a kind of reference book)

Can you help me to learn more?

(Other definitions for annuals that I've seen before include "Yearly books" , "Yearly plants" , "regular books" , "Yearly publications" , "Books published once a year" .)

I've seen this clue in The Telegraph.
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