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1. (Plants) any of several terrestrial ferns of the genus Ophioglossum, esp O. vulgatum, that grow in the N hemisphere and have a spore-bearing body that sticks out like a spike from the leaf: family Ophioglossaceae
2. (Plants) another name for dogtooth violet
1. any of various ferns of the genus Ophioglossum and family Ophioglossaceae, having a tall fruiting spike resembling a snake's tongue.
2. any of several American dogtooth violets.