In a direction that is upward or forward; in an antrorse manner.
From 'antrorse' + English adverbial suffix '-ly'. This botanical adverb formed in the 18th-19th century to modify verbs describing how plant structures grow or are oriented.
Just like we say 'backward' and 'forward,' botanists needed 'antrorsely' to describe exactly how plant parts point—it's a tiny word that made botanical descriptions much more precise.
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