How many letters does the top answer for “a plant of the genus actaea having acrid poisonous berries” have?

The most common answer is baneberry (9 letters).

Crossword clue: a plant of the genus actaea having acrid poisonous berries

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

baneberry 9 letters wn-def

a plant of the genus Actaea having acrid poisonous berries

cohosh 6 letters wn-def

a plant of the genus Actaea having acrid poisonous berries