A leaf or leaf-like structure that develops as part of a bud or sprout in certain plants.
From Greek 'blastos' (bud) + 'phyllon' (leaf). Rare botanical term from the 19th century used to describe transitional or developing leaf structures.
This word is almost extinct in modern biology—it shows how naming systems in science sometimes create super-specific terms that later get replaced with simpler words. Progress means losing some beautiful complexity!
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