A small herbaceous plant with threadlike or feathery seed structures, common in dry regions.
From Spanish 'alfilerillo' (little pin), referring to the needle-like seed pods that resemble tiny pins or threads.
Filaree seeds have a corkscrew-like tail that literally screws itself into the ground when wet, then unscrews when dry—it's an engineering marvel that inspired scientists studying plant-based robotics.
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