A plant of the mustard family, also known as shepherd's purse, with small heart-shaped seed pods.
Compound of 'case' (referring to the pod or capsule shape) and 'weed,' describing a common plant with distinctive case-like seed containers.
The 'case' in 'caseweed' refers to those tiny heart-shaped seed pods that look like little cases—medieval herbalists literally named plants after what they look like, making botany a visual language.
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