Primarily, full lists of regions' Amaryllidacaea, etc! (6)

I believe the answer is:

florae

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'primarily full lists of regions' amaryllidacaea etc' is the definition.
I can't judge whether this definition defines the answer.

'primarily full lists of regions' amaryllidacaea etc' is the wordplay.
'primarily' suggests taking the first letters.
The initial letters of 'full lists of regions amaryllidacaea etc' is 'FLORAE'.

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(Another definition for florae that I've seen is " Loafer (anag.)".)

I've seen this clue in The Everyman puzzle in The Observer.

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