Rumex mexicanus
Rumex subarcticus
Mexican dock, Mexican willow, Mexican willow or dock
subarctic or subarctic willow dock
erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60(–90) cm.
usually procumbent, rarely ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60 cm.
blades light green to yellowish green, linear-lanceolate, occasionally lanceolate, 6–14 × 1–3.5(–4) cm, usually ca. 5–7 times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, flat or undulate, apex acute or attenuate.
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.
terminal and axillary, terminal usually occupying distal 1/5–1/3 of stem, rather dense or interrupted in proximal 1/2, usually broadly paniculate (branches simple or with few 2d-order branches).
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).
articulated in proximal 1/3 or almost near base, filiform (thickened distally), 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation indistinctly swollen.
articulated in proximal 1/3, filiform, 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation slightly swollen.
10–20 in whorls;
inner tepals broadly ovate-triangular, occasionally broadly triangular, 3.5–4.5(–5) × 3.5–4(–5) mm, base truncate or indistinctly cordate, margins entire or indistinctly erose, apex obtuse or subacute;
tubercles 3, equal or subequal (much narrower than inner tepals).
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.
brown or dark reddish brown, 2–3 × 1.5–2 mm.
brown or dark reddish brown, 2–3 × 1.5–2 mm.
= 40.
= 20.
Rumex mexicanus
Rumex subarcticus
Some authors recognize Rumex mexicanus in the broad sense, including in it many other taxa treated here as separate entities. For consistency, the entities of the R. salicifolius aggregate that are recognized herein are kept separate pending additional taxonomic research.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
