Douglasia ochotensis

(Roemer & Schultes) Hultén

Ark. Bot., n. s. 7: 103. 1968 ,.

Common names: Alaska dwarf primrose
Basionym: Androsace ochotensis Roemer & Schultes in J. J. Roemer et al., Syst. Veg. 4: 786. 1819
Synonyms: Androsace arctica Chamisso & Schlechtendal Androsace tschuktschorum R. Knuth Primula arctica (Chamisso & Schlechtendal) Kuntze
Treatment appears in FNA Volume 8. Treatment on page 267. Mentioned on page 264, 266, 297.

Plants loosely cespitose cushions or mats with branched caudex. Stems prostrate, densely covered with marcescent, imbricate, reddish-brown leaves proximally and terminal, green leaf-rosettes. Leaves prominently recurved, thin; blade linear to lanceolate, 3–10 × 1–1.5 mm, margins entire, apex obtuse, hairy, hairs simple, surfaces glabrate to hairy, hairs simple. Scapes 5–10 mm, elongating little in fruit, glabrous or minutely glandular and hairy, hairs simple and forked. Inflorescences 1-flowered, ebracteate or, sometimes, bracteate; bract 1, linear-lanceolate, 0.5–1 × 0.5 mm, glabrous. Pedicels absent. Flowers: calyx 3–7 × 3–5 mm, glabrous; corolla pink, limb 4–12 mm diam., lobes 1–3 × 1–2 mm, margins entire. 2n = 38, 40.


Phenology: Flowering early summer.
Habitat: Rocky places on tundra, scree slopes
Elevation: 0-700 m

Distribution

V8 547-distribution-map.gif

N.W.T., Yukon, Alaska, e Asia (Russian Far East)

Discussion

Douglasia ochotensis is the only North American member of the genus to occur also in Asia; its range extends from the Sea of Okhotsk throughout the Bering Strait region, and across the Brooks Range to the Mackenzie River. It varies considerably with respect to flower size and degree of looseness in the growth habit; these characters are strongly affected by exposure, substrate stability, and moisture availability. Douglasia ochotensis can be easily distinguished from all other members of the genus by its prominent, imbricate, recurving, reddish brown, marcescent leaves.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Douglasia ochotensis"
violet +  and white +
not connivent +
erose +  and entire +
Sylvia Kelso +
(Roemer & Schultes) Hultén +
attenuate +
Androsace ochotensis +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
crenulate +  and denticulate +
linear;lanceolate +
1mm;1.5mm +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
linear-lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
5-angled +  and campanulate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
ovoid +  and globose +
Alaska dwarf primrose +
constricted +
N.W.T. +, Yukon +, Alaska +  and e Asia (Russian Far East) +
0-700 m +
operculate +  and capsular +
Rocky places on tundra, scree slopes +
nectariferous +
bracteate +, , +, ebracteate +  and 1-flowered +
solitary +, involucrate +  and 2-10-flowered +
reddish-brown +
marcescent +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not reflexed +
1mm +  and 2mm +
tenuinucellate +  and bitegmic +
erect +  and ascending +
Flowering early summer. +
Ark. Bot., n. s. +
elongating +
hairy +, glandular +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
oblong +  and 4-angled +
connate +  and distinct +
branched +  and simple +
prostrate +  and ascending +
inflated +
glabrate +  and hairy +
Androsace arctica +, Androsace tschuktschorum +  and Primula arctica +
Douglasia ochotensis +
Douglasia +
species +
reddish-brown +  and green +
perennial +  and annual +
stoloniferous +  and rhizomatous +
cushion +, cespitose +  and plant +