Epithets
| xylorhiza |
woody root |
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| xylorrhiza |
woody root |
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| yakushimanum |
of or from Yakushima, an island in southern Japan |
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| yezoalpina |
from (the mountains of) Hokkaido |
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| yezoensis |
from (the mountains of) Hokkaido |
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| yuccifolium |
having Yucca-like leaves |
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| yunnanense |
of or from Yunnan, China |
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| zaleucus |
very white |
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| zebrina |
striped like a zebra |
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| zonalis |
banded or girdled with a distinct color |