Douglasia arctica

Hooker

Fl. Bor.-Amer. 2: 120. 1838 ,.

Common names: Mackenzie River dwarf primrose
Endemic
Synonyms: Douglasia nivalis var. glabra Duby
Treatment appears in FNA Volume 8. Treatment on page 265. Mentioned on page 264, 266.

Plants loosely cespitose cushions from branched caudex. Stems prostrate to ascending, with marcescent, imbricate, reddish leaves proximally and terminal, green leaf-rosettes. Leaves erect, thin; blade linear to linear-lanceolate, 3–10 × 0.5–2 mm, margins entire, shortly ciliolate, hairs simple, apex acute or obtuse, usually glabrous, surfaces glabrous. Scapes to 2 mm in early anthesis, to 2–4 cm in fruit, minutely glandular and hairy, hairs branched, sometimes glabrescent. Inflorescences 1 (–2) -flowered, bracteate; bracts 1 (–2), ovatelanceolate, 1–2 × 0.5–1 mm, glabrous. Pedicels absent. Flowers: calyx 3–6 × 3–4 mm, glabrous; corolla pink, white in age, limb 5–7 mm diam., lobes 2.5–3 × 1 mm, margins entire or slightly erose. 2n = 38.


Phenology: Flowering early summer.
Habitat: Stony places on tundra, alpine screes
Elevation: 0-1000 m

Discussion

Douglasia arctica is most common in northern Alaska and northwesternmost Canada. It can be separated from its closest relative, D. gormanii, on the basis of its looser growth habit and shortly ciliolate, otherwise glabrous leaves. Douglasia gormanii has a tight growth habit and forked and branched hairs on the leaves.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Douglasia arctica"
violet +  and white +
not connivent +
erose +  and entire +
Sylvia Kelso +
Hooker +
attenuate +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
crenulate +  and denticulate +
linear;linear-lanceolate +
0.5mm;2mm +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
ovatelanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
5-angled +  and campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ovoid +  and globose +
Mackenzie River dwarf primrose +
white +  and pink +
constricted +
N.W.T. +, Yukon +  and Alaska. +
0-1000 m +
operculate +  and capsular +
Stony places on tundra, alpine screes +
branched +  and simple +
nectariferous +
glabrescent +
bracteate +  and 1(-2)-flowered +
solitary +, involucrate +  and 2-10-flowered +
marcescent +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not reflexed +
erose +  and entire +
tenuinucellate +  and bitegmic +
erect +  and ascending +
Flowering early summer. +
Fl. Bor.-Amer. +
elongating +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
oblong +  and 4-angled +
connate +  and distinct +
branched +  and simple +
prostrate +  and ascending +
inflated +
Douglasia nivalis var. glabra +
Douglasia arctica +
Douglasia +
species +
perennial +  and annual +
stoloniferous +  and rhizomatous +
cushion +, cespitose +  and plant +