Minuartia rossii

(R. Brown ex Richardson) Graebner in P. F. A. Ascherson et al.

in P. F. A. Ascherson et al., Syn. Mitteleur. Fl. 5(1): 772. 1918.

Common names: Ross’s sandwort
Illustrated
Basionym: Arenaria rossii R. Brown ex Richardson in J. Franklin et al., Narr. Journey Polar Sea, 738. 1823
Synonyms: Alsinanthe rossii (R. Brown ex Richardson) Á. Löve & D. Löve Alsinopsis rossii (R. Brown ex Richardson) Rydberg Arenaria rossii var. apetala Maguire Minuartia orthotrichoides Nannfeldt Minuartia rolfii Minuartia rossii var. orthotrichoides (Schischkin) Hultén
Treatment appears in FNA Volume 5. Treatment on page 133. Mentioned on page 116, 117, 119, 120, 125.

Plants perennial, densely pulvinate to loosely cespitose. Taproots stout, woody. Stems ascending to spreading, green or often purple, 1–3 cm, glabrous, internodes of flowering-stems 0.2–1 times as long as leaves. Leaves overlapping, ± tightly (vegetative), ± evenly spaced proximally (cauline), connate-perfoliate proximally, with tight, herbaceous sheath 0.2–0.3 mm; blade upwardly curved, green or often purple, keeled, prominently 1-veined abaxially, subulate, 3-angled, 1–4 × 0.5–0.7 mm, flexuous, margins rounded, herbaceous, smooth, apex green to purple, rounded, navicular, shiny, glabrous; axillary leaves well developed. Inflorescences solitary flowers, axillary or terminal (rarely present); bracts absent. Pedicels 0.1–2 cm, glabrous. Flowers: hypanthium disc-shaped; sepals 1-veined, oblong-ovate (herbaceous portion usually purple, oblong-ovate), 1.5–2.5 mm, not enlarging in fruit, apex often purple, obtuse to acuminate, navicular, not hooded, glabrous; petals obovate to spatulate, 1.5–2 times as long as sepals, apex obtuse, entire. Capsules on stipe ca. 0.1–0.2 mm, spheric, 1.5–2.5 mm, equaling sepals. Seeds brown, suborbiculate, compression unknown, ca. 0.6 mm, obscurely reticulate. 2n = 58 (Russia), 60.


Phenology: Flowering spring–summer.
Habitat: Wet, turfy, gravelly, or sandy calcareous barrens, high arctic, alpine tundra, heathlands
Elevation: 0-500 m

Distribution

V5 273-distribution-map.gif

Greenland, N.W.T., Nunavut, Yukon, Alaska, Europe (Spitzbergen), Asia (Russian Far East)

Discussion

Minuartia rossii is the northernmost member of the M. rossii complex (S. J. Wolf et al. 1979; B. Maguire 1958), a pulvinate species of moist arctic areas. While specimens occasionally have many flowers, some specimens have few if any, instead reproducing via small axillary fascicles of leaves or short shoots in the upper leaf axils (see also Ö. Nilsson 2001).

Selected References

None.

Lower Taxa

None.

"-1timesaslongasleaves" 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 "Minuartia rossii"
green +  and purple +
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(R. Brown ex Richardson) Graebner in P. F. A. Ascherson et al. +
Arenaria rossii +
flexuous +  and curved +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3-angled +, subulate +  and keeled +
? (?) +  and ? (?) +
0.5mm;0.7mm +
reduced +
scarious +  and herbaceous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Ross’s sandwort +
axillary +  and terminal +
dish--shaped +
expanded +
Greenland +, N.W.T. +, Nunavut +, Yukon +, Alaska +, Europe (Spitzbergen) +  and Asia (Russian Far East) +
0-500 m +
straight +  and curved +
central +  and peripheral +
axillary +  and terminal +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Wet, turfy, gravelly, or sandy calcareous barrens, high arctic, alpine tundra, heathlands +
disc--shaped +  and dish +
terminal +  and axillary +
connate-perfoliate +
spaced +  and overlapping +
connate +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
reflexed;erect;arcuate-spreading +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Lilac (?) +, Pink (?) +  and White (?) +
fugacious +
Flowering spring–summer. +
in P. F. A. Ascherson et al., Syn. Mitteleur. Fl. +
muriculate-papillate +  and tuberculate +
suborbiculate +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
distinct +
oblong-ovate +
not enlarging +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Illustrated +
branched +  and simple +
ascending;spreading +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
[30 +  and 3 +
papillate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
distinct +
filiform +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Alsinanthe rossii +, Alsinopsis rossii +, Arenaria rossii var. apetala +, Minuartia orthotrichoides +, Minuartia rolfii +  and Minuartia rossii var. orthotrichoides +
Minuartia rossii +
Minuartia +
species +
divided +
10 +  and 8 +
erect +  and recurved +
rhizomatous +  and taprooted +
plant +  and cespitose +
pubescence of simple hairs or stalked glands +  and glabrous +
23 +, 15 +, 14 +, 13 +, 12 +, 10 +, 9 +  and 7 +