An alternate or variant plural form of achene, referring to multiple small dry fruits that contain a single seed.
From the Greek root of achene with a Latin-influenced plural ending '-ia', sometimes used in older botanical texts as an alternative plural to 'achenes'.
Botanical terminology has multiple plural forms because botanists mixed Greek and Latin in their naming—'achenia' and 'achenes' are both correct, showing how scientific language evolved from multiple sources.
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