Having small spines or spine-like protrusions; past participle form of echinulate.
From Latin 'echinulatus,' the same root as echinulate, with the '-ed' suffix added to indicate a completed state or past condition.
Pollen grains from plants like those in the daisy family have echinulated surfaces—those tiny spikes actually help them stick to bees' bodies with an electrostatic attraction that scientists are still studying!
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