Rumex subarcticus

Lepage

Naturaliste Canad. 82: 191. 1955.

Common names: Subarctic or subarctic willow dock
Endemic
Synonyms: Rumex pallidus subsp. subarcticus (Lepage) Á. Löve
Treatment appears in FNA Volume 5. Treatment on page 513. Mentioned on page 492, 512.

Plants perennial, glabrous, with vertical rootstock. Stems usually procumbent, rarely ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60 cm. Leaf-blades narrowly linear-lanceolate, 6–17 × 1–3 cm, usually ca. 7–10 times as long as wide, widest near middle, usually thick, not coriaceous or subcoriaceous, base cuneate, margins entire, usually strongly undulate and/or crenulate, apex acute. Inflorescences terminal and axillary, terminal usually occupying distal 1/5–1/3 of stem, rather dense towards apex, distinctly interrupted in proximal 1/2, usually broadly paniculate (branches almost at right angles to main axis, simple or with few 2d-order branches). Pedicels articulated in proximal 1/3, filiform, 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation slightly swollen. Flowers 10–20 in whorls; inner tepals, broadly deltoid or deltoid-ovate, 3–4 × 3.2–4 (–4.5) mm, base truncate, margins entire or indistinctly crenulate, apex obtuse or subacute; tubercles absent, rarely small and indistinct. Achenes brown or dark reddish-brown, 2–3 × 1.5–2 mm. 2n = 20.


Phenology: Flowering early summer.
Habitat: Mostly coastal and alluvial habitats: sea beaches, shores of rivers and streams, wet meadows
Elevation: 0-200 m

Discussion

Some specimens of Rumex subarcticus have well-developed tubercles similar to those of R. pallidus (N. M. Sarkar 1958), to which it is closely related and of which it may be regarded as a northwestern subspecies or variety (see Á. Löve 1986).

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property.No values specified.

... more about "Rumex subarcticus"
unwinged +  and weakly winged +
dark reddish-brown;brown +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
pyramidal +, compressed-3-gonous +  and 3-gonous +
1.5mm;2mm +
yellow +  and brownish yellow +
ovate +  and elongate +
Sergei L. Mosyakin +
Lepage +
leafy +  and regular +
not articulated +
cuneate +
crisped;undulate;flat;crisped;undulate;flat +
foliaceous +  and perfoliate +
scale-like +
tuberculate +
just below the soil surface or and above the soil surface +  and spreading +
Subarctic or subarctic willow dock +
Nunavut. +  and Que. +
0-200 m +
free +  and distinct +
unisexual +, bisexual +  and , +
disarticulating +  and solid +
decumbent to erect +  and prostrate +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
Mostly coastal and alluvial habitats: sea beaches, shores of rivers and streams, wet meadows +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
always distinctly wider and longer +
deltoid-ovate +  and deltoid +
3.2mm +  and 4mm +
nonmembranous +
6 cm60 mm <br />0.06 m <br /> (17 cm170 mm <br />0.17 m <br />) +
subcoriaceous +  and not coriaceous +
deciduous +
cauline +  and basal +
pubescent +  and glabrous +
crenulate +, entire +  and undulate +
smaller +
narrower +
swollen +
partly +  and foliaceous +
deciduous +  and persistent +
cylindric +
membranous +
anatropous +, , +  and orthotropous +
2+-2.5 times as long as inner tepals +
accrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
campanulate +
accrescent +
fleshy +, indurate +  and membranous +
Flowering early summer. +
(2-)3(-4)-carpellate +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Naturaliste Canad. +
slender;stout +
not scapose +
1/5 +  and 1/3 +
plumose +  and fimbriate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
distinct +
reflexed;spreading +
Rumex pallidus subsp. subarcticus +
Rumex subarcticus +
Rumex sect. Axillares +
species +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
stoloniferous +  and rhizomatous +
10 +, 9 +, 8 +  and 7 +