Ligule (Coca)
Definition
A paired membranous flap at the junction of the leaf blade and petiole unique to Erythroxylum. Its presence in intact dried coca leaves is a morphologically specific diagnostic character for the genus.
- Structure
- Paired membranous flap
- Location
- Leaf blade and petiole junction
- Genus specificity
- Unique to Erythroxylum
- Forensic use
- Morphological diagnostic character for intact dried leaves
Common questions
Why does the ligule matter for identifying dried coca leaves?+
When leaves are seized whole and intact rather than as processed powder, the ligule provides a visible morphological feature specific to Erythroxylum that a botanist can check without needing chemical testing, giving a quick screening confirmation of genus.
Does the ligule remain useful once leaves are processed into coca paste or extract?+
No, the ligule is a structural leaf feature that is destroyed once the material is macerated or chemically processed, so its diagnostic value is limited to cases where at least some intact dried leaves are recovered.
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