Species: Dryas drummondii var. drummondii Richards. ex Hook.

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Dryas drummondii var. drummondii Richards. ex Hook.

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TAXONOMY

Family:

Rosaceae

Genus:

Dryas

Species Synonyms:

none

Common Names:

yellow mountain avens
yellow dryad
Drummond’s dryad

DISTRIBUTION

Canada:

Yukon – Mackenzie District – northwestern Saskatchewan, south to central British Columbia – southwestern Alberta, eastern Quebec – Newfoundland, isolated on Lake Superior north shore

Saskatchewan:

northwestern Saskatchewan; Lake Athabasca north shore – Carswell Lake

Ecoregion:

Athabasca Plain, Tazin Lake Upland

HABITAT

Saskatchewan:

calcareous rock outcrops

RARITY STATUS

Provincial Status According
to Harms (2003):

Endangered

Nature Conservancy Status:

G5 S1

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Dryas drummondii var. drummondii is endangered because of extreme rarity in Saskatchewan. It is regionally restricted to one general region of the province. No threats are known or anticipated for this species.

SPECIES DESCRIPTION

Height:

mat-forming shrubs

Stems:

young branches white tomentose

Leaves:

1 – 3 cm long, elliptic to obovate, base cuneate, apex rounded, densely white tomentose below, dark green above, margin coarsely crenate

Inflorescence:

flowers solitary; scape 5 – 20 cm long, tomentose

Flowers:

hypanthium black glandular-pubescent; calyx 8 – 10-merous, black glandular-pubescent, ovate; corolla 8 – 10-merous yellow, strongly ascending; stamens numerous; carpels numerous

Fruits:

aggregate of achenes; styles plumose in fruit, 3 – 5 cm long

ROSACEAE KEY FOR GENERA FOUND IN SASKATCHEWAN

1 Shrubs or trees	2
1 Herbs, may have a woody base	11

2 Leaves compound	3
2 Leaves simple	6

3 Ovary inferior or appearing inferior; achenes enclosed in a fleshy hypanthium (hip or pome)	4
3 Ovary superior; fruits aggregates of achenes or drupelets	5

4 Flowers numerous, white, small (to about 1 cm wide); thorns and prickles absent; fruit a pome with 2 – 4 carpels	Sorbus
4 Flowers solitary to few, rose-coloured, larger; thorns and/or prickles present; fruit a hip with many carpels	Rosa

5 Fruit an aggregate of drupelets on an enlarged, spongy receptacle; corolla white to pink; flowers in racemes; stems often prickly	Rubus
5 Fruit an aggregate of achenes, receptacle not spongy; corolla white or yellow; flowers solitary or in cymes; stems not prickly	Dasiphora

6 Ovary inferior or apparently inferior; achenes enclosed in the enlarged, fleshy hypanthium (pomes)	7
6 Ovary superior; fruits drupes, achenes, follicles, or capsules	9

7 Stems commonly armed with thorns; leaves usually lobed or incised	Crataegus
7 Stems always unarmed; leaves rarely lobed or incised	8

8 Leaves entire; flowers pinkish	Cotoneaster
8 Leaves toothed at the apex; flowers whitish	Amelanchier

9 Fruit a drupe	Prunus
9 Fruit of achenes or follicles	10

10 Fruit an aggregate of follicles; stems erect	Spiraea
10 Fruit an aggregate of achenes; stems mat-forming	Dryas

11 Leaves trifoliate	12
11 Leaves pinnately compound with at least 5 leaflets	15

12 Leaflets cleft into linear segments	Chamaerhodos
12 Leaflets at most moderately incised into broad teeth or lobes	13

13 Receptacle not enlarged, fruit dry; stamens 5; corolla yellow	Sibbaldiopsis
13 Receptacle greatly enlarged and red or white in fruit (strawberry or raspberry); stamens 10 – many; corolla white	14

14 Receptacle red, fruit an aggregate of achenes	Fragaria
14 Receptacle white, fruit an aggregate of drupelets	Rubus

15 Fruits follicles	Sorbaria
15 Fruits achenes	16

16 Calyx turbinate, with hooked bristles at summit	Agrimonia
16 Calyx cup-shaped to hemispheric, unarmed	17

17 Styles persistent and plumose in fruit	Geum
17 Styles deciduous in fruit	18

18 Flowers reddish purple; plant decumbent; aquatic or marshy environments	Comarum
18 Flowers white or yellow; stems erect; plants of drier habitats	19

19 Flowers solitary; leaves silvery white below	Argentina
19 Flowers in few to many-flowered cymes; leaves not silvery-white below	Potentilla