Flora of North America species comparison

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Dryas alaskensis

alaskan mountain-avens
Habit Plants 2–18 cm.
Leaf

blades obovate or oblong-elliptic to narrowly oblong, 4.5–39 × 2–19 mm, base usually cuneate, sometimes truncate or cordate, margins coarsely dentate to crenate, sinuses 45–60% to midvein, apex rounded to obtuse, surfaces smooth to rugose, plicate, midvein and lateral veins adaxially sunken into folds, abaxial sparsely hairy to tomentose, adaxial usually glabrous, sometimes sparsely hairy proximally on midvein, feathery hairs and stipitate glands absent.
Peduncles

25–130 mm.
Flowers

erect at flowering;

sepals lanceolate to narrowly elliptic, 5.5–9 × 1.5–2 mm;

petals 8, spreading, usually white or cream, sometimes yellow, 9–14 × 5–11 mm;

filaments glabrous.
Achenes

2–3 mm;

styles 12–27 mm.
2n

= 18.

Dryas alaskensis
Phenology Flowering Jun–Aug.
Habitat Solifluction soil, sand-gravel beaches, sandy lakeshores, old beach ridges, wet meadows, stream banks, dry rocky knolls, rocky heath, ericaceous tundra
Elevation 100–1800 m (300–5900 ft)
Distribution
from FNA
AK; YT; e Asia (Russian Far East: Chukotka)
Discussion

Dryas punctata Juzepczuk has been reported from North America as a synonym of D. octopetala var. octopetala (E. Hultén 1968); it is now considered to be confined to northeastern Europe and northern Asia (R. Elven et al., http://nhm2.uio.no/paf/). Hultén (1959b) reduced D. octopetala var. glabrata to the rank of forma and later to synonymy under D. alaskensis (Hultén 1968).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 329.
Parent taxa Rosaceae > subfam. Dryadoideae > tribe Dryadeae > Dryas
Sibling taxa
D. ajanensis, D. drummondii, D. hookeriana, D. incisa, D. integrifolia, D. octopetala
Synonyms D. octopetala subsp. alaskensis, D. octopetala var. glabrata, D. punctata subsp. alaskensis
Name authority A. E. Porsild: Canad. Field-Naturalist 61: 187, plate 1, figs. 3 – 5. (1948)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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