A variant or closely related plant to alfilerilla, also South American, with sharp needle-like fruits adapted for seed dispersal.
Spanish diminutive form of 'alfiler' (needle), ending in '-illo,' emphasizing the tiny needle-like quality of the plant's distinctive seed structures.
These needle plants are so good at hitchhiking on animals and clothes that they've spread from South America to every continent except Antarctica—they're tiny but incredibly successful travelers!
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