The bottom portion of a leaf blade where it attaches to the petiole or directly to the stem. The shape of the leaf base can be rounded, heart-shaped, wedge-shaped, or other forms important for identification.
From Old English 'base' meaning 'foundation' or 'bottom part.' The botanical usage developed alongside systematic leaf morphology studies in the 18th and 19th centuries as precise descriptive terminology became essential.
The leaf base is like a plant's signature - some species have heart-shaped bases that clasp the stem like a hug, while others have narrow, wedge-shaped bases that taper gradually! This tiny detail can be the key to identifying closely related species.
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