| Dryas octopetala |
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| Scientific classification |
| Kingdom: |
Plantae |
| Clade: |
Tracheophytes |
| Clade: |
Angiosperms |
| Clade: |
Eudicots |
| Clade: |
Rosids |
| Order: |
Rosales |
| Family: |
Rosaceae |
| Genus: |
Dryas |
| Species: |
D. octopetala |
| Binomial name |
Dryas octopetala
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| Global distribution |
| Synonyms |
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- Dryadaea octopetala (L.) Kuntze
- Dryas ajanensis Juz.
- Dryas alaskensis Porsild
- Dryas alpina Salisb.
- Dryas babingtoniana A.E.Porsild
- Dryas caucasica Juz.
- Dryas caucasica Juz. ex Woronow
- Dryas chamaedrifolia (Crantz) Gray
- Dryas chamaedrifolioides Pall.
- Dryas chamaedryoides Pall.
- Dryas crenata Raf.
- Dryas depressa (Bab.) Bab.
- Dryas eriopoda Gand.
- Dryas henricae auct.
- Dryas hookeriana Juz.
- Dryas incanescens Juz.
- Dryas incisa auct.
- Dryas lanata Stein ex Correvon
- Dryas lepida Gand.
- Dryas montana Bubani
- Dryas nervosa Juz.
- Dryas nivea F.Kern. ex Correvon
- Dryas octopetala var. angustifolia C.L.Hitchc.
- Dryas octopetala var. camschatica (Juz.) Hultén
- Dryas octopetala var. depressa Bab.
- Dryas octopetala f. hirsuta Hartz
- Dryas octopetala var. luteola Hultén
- Dryas octopetala subsp. punctata (Juz.) Hultén
- Dryas octopetala subsp. subincisa Jurtzev
- Dryas octopetala var. viscida Hultén
- Dryas octopetala subsp. viscida (Hultén) Kozhevn.
- Dryas pentaphyllaea Hill
- Dryas punctata Juz.
- Dryas punctata var. cinerea Jurtzev
- Dryas punctata var. kamtschatica (Juz.) Kozhevn.
- Dryas subincisa (Jurtzev) Tzvelev
- Dryas subincisa var. minor (Hook.) Tzvelev
- Dryas tschonoskii Juz.
- Dryas vagans Juz.
- Geum chamaedrifolium Crantz
- Geum octopetalum (L.) E.H.L.Krause
- Ptilotum octopetalum (L.) Dulac
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Dryas octopetala, the mountain avens, eightpetal mountain-avens, white dryas or white dryad, is an Arctic–alpine flowering plant in the family Rosaceae. It is a small prostrate evergreen subshrub forming large colonies. The specific epithet octopetala derives from Greek octo 'eight' and petalon 'petal', referring to the eight petals of the flower, an unusual number in the Rosaceae, where five is the normal number. However, flowers with up to 16 petals also occur naturally.
As a floral emblem, it is the official territorial flower of the Northwest Territories and the national flower of Iceland.