Cerastium regelii

Ostenfeld

Skr. Vidensk.-Selsk. Christiana, Math.-Naturvidensk. Kl. 1909(8): 10, fig. 11. 1910.

Common names: Regel’s mouse-ear chickweed céraiste de Regel
Synonyms: Cerastium alpinum var. caespitosum Malmgren Cerastium gorodkovianum Schischkin Cerastium jenisejense Hultén Cerastium regelii subsp. caespitosum (Malmgren) Tolmatchew
Treatment appears in FNA Volume 5. Treatment on page 89. Mentioned on page 74, 76, 77, 90.

Plants perennial, highly variable, ranging from small, pulvinate, 1–6 (–8) cm, often not flowering, to rhizomatous. Stems erect or trailing, branched, pubescence confined to alternating lines of short, crispate to more elongate hairs; flowering-stems erect, 1–6 (–8) cm in pulvinate plants, to 20 cm in creeping plants, pubescence spreading to retrorse; nonflowering shoots creeping, elongate, 1–30 cm, with terminal, fleshy, gemmaelike buds; small axillary tufts of leaves absent. Leaves sessile; blade rotund and obovate to ovate, elliptic, or broadly lanceolate, 3–9 × 2–6 mm, succulent, apex ± acute to obtuse; proximal leaves connate at base, blades becoming marcescent, broadly and shortly spatulate, margins and midrib ciliate, glabrous to sparsely pubescent, hairs long, colorless. Inflorescences erect, lax, 1–5 (–11) -flowered cymes; bracts elliptic to lanceolate, with or without narrow, scarious margins, with long, strigose hairs. Pedicels erect, usually straight, 1–10 (–30) mm, shorter than sepals in pulvinate plants, longer in creeping plants, softly pubescent, hairs patent, of varying lengths, glandular and eglandular. Flowers: sepals often purple-tinged, broadly elliptic, 4–6 mm, margins broad, apex round, obtuse, sparsely pubescent, hairs colorless, long, eglandular, and short, glandular; petals obovate, 4–8 mm, 1.5–2 times as long as sepals, apex deeply 2-fid; stamens 10; styles 5. Capsules cylindric, slightly curved, 6–12 mm, 1–2 times as long as sepals; teeth 10, erect to slightly spreading, margins convolute. Seeds dark-brown, 1 mm diam., shallowly tuberculate; testa not inflated, tightly enclosing seed. 2n = 72.


Phenology: Flowering summer.
Habitat: High-arctic tundra to low-arctic taiga, often in wet solifluction areas or in moss
Elevation: 0-900 m

Distribution

V5 185-distribution-map.gif

Greenland, N.W.T., Nunavut, Que., Alaska, nw Europe (Spitsbergen), Asia (Russian Far East), Asia (Siberia)

Discussion

Until recently, Cerastium gorodkovianum (= C. jenisejense) was recognized as a species separate from C. regelii, the former being low arctic and the latter high arctic. A recent experimental study by O. M. Heide et al. (1990) elegantly demonstrated that the morphological differences are the result of the effects of day length and temperature on development. In the high arctic, C. regelii rarely flowers and is compact and pulvinate with small, broadly obovate, marcescent leaves that are fleshy, subglabrous, or with strigose cilia. In the low arctic and taiga zone, C. regelii becomes a slender, straggling plant with slender, erect inflorescences bearing a few large flowers. The creeping sterile shoots produce terminal bulbils for vegetative dispersal.

Apparent hybrids between Cerastium regelii and C. beeringianum were named C. regelii var. hirsutum Hultén. An apparent hybrid with C. arvense subsp. strictum also has been collected along the Nisling River in the Yukon.

Lower Taxa

None.

"-2timesaslongassepals" is not declared as a valid unit of measurement for this property."-2timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Cerastium regelii"
perigynous +  and hypogynous +
John K. Morton +
Ostenfeld +
elliptic to broadly ovate +  and linear +
marcescent +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
spatulate +, obovate +  and ovate elliptic or broadly lanceolate +
2mm;6mm +
often +  and herbaceous +
elliptic +  and lanceolate +
reduced +
herbaceous +  and scarious +
8 +  and 6 +
cylindric +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Regel’s mouse-ear chickweed +  and céraiste de Regel +
1-5(-11)-flowered +
dish--shaped +
expanded +
Greenland +, N.W.T. +, Nunavut +, Que. +, Alaska +, nw Europe (Spitsbergen) +, Asia (Russian Far East) +  and Asia (Siberia) +
0-900 m +
straight +  and curved +
central +  and peripheral +
pistillate +  and subsessile +
inconspicuous +
unisexual +  and bisexual +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0 cm0 mm <br />0 m <br /> (20 cm200 mm <br />0.2 m <br />) +
stalked +  and simple +
High-arctic tundra to low-arctic taiga, often in wet solifluction areas or in moss +
strigose +  and alternating +
elongate +  and crispate +
disc--shaped +  and dish +
connate +
alternating +
translucent +  and purplish +
glabrous;sparsely pubescent +
glabrous +  and sparsely pubescent +
swollen +
1 cm10 mm <br />0.01 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
perigynous +  and hypogynous +
fugacious +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering summer. +
pulvinate +
Skr. Vidensk.-Selsk. Christiana, Math.-Naturvidensk. Kl. +
heide1990a +
1 cm10 mm <br />0.01 m <br /> (?) +
tuberculate +
compressed +  and angular-obovate +
purple-tinged +
persistent +
distinct +
elliptic;ovate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
trailing;erect +
subterminal +
[30 +  and 5 +
roughened +  and papillate +
distinct +
clavate +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Cerastium alpinum var. caespitosum +, Cerastium gorodkovianum +, Cerastium jenisejense +  and Cerastium regelii subsp. caespitosum +
rooting +  and rhizomatous +
Cerastium regelii +
Cerastium +
species +
not inflated +
erect;slightly spreading +
divided +
10 +  and 8 +
pubescence of simple hairs or stalked glands +  and glabrous +
19 +, 18 +, 17 +, 15] +, 13 +  and [9 +