The distinctive involucres help diagnose this species. The petiole is also conspicuous. It is flattened, and the edges are provided with dark hairs similar to those of the rhizome.

The distinctive involucres help diagnose this species. The petiole is also conspicuous. It is flattened, and the edges are provided with dark hairs similar to those of the rhizome.
Gymnocarpium has ca. 10 species and several hybrids. It occurs mainly in the temperate zones of the N Hemisphere (Asia, Europe, and North America) and subtropical mountains of Asia. The American G. dryopteris is a fertile allotetraploid species that...
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