In a gemmiparous manner; through or by means of asexual reproduction via buds; in the way that budding organisms reproduce.
From gemmiparous (adjective) + -ly (adverb suffix). This creates an adverbial form of the biological adjective, following standard English word formation patterns.
While this adverb is technically constructible and might appear in scientific writing, you'd more likely see 'by gemmiparity' in actual usage—showing how some grammatically possible words remain rare because there are better ways to say the same thing.
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