Rumex mexicanus
Rumex nematopodus
Mexican dock, Mexican willow, Mexican willow or dock
Arizona dock
erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60(–90) cm.
erect, branched in distal 1/2, 40–85(–100) 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.
ocrea deciduous or partially persistent at maturity;
blade oblong-lanceolate to lanceolate, 20–35 × 5–12 cm, base cordate to broadly cuneate, margins entire or nearly so, flat, apex acute or attenuate.
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, occupying distal 1/2–2/3 of stem, interrupted in proximal 1/2, paniculate, branched.
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, 12–20 mm, 3–4 times as long as inner tepals, articulation weakly evident, not 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 ovate-triangular, 4–5(–6) × 3–4(–5) mm, base truncate to subcordate, margins entire, apex acute to subacute;
tubercles absent.
brown or dark reddish brown, 2–3 × 1.5–2 mm.
brown, 3 × 1.5 mm.
= 40.
= 120.
Rumex mexicanus
Rumex nematopodus
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.)
Rumex nematopodus has been reported from several localities in Arizona, New Mexico, and northern Mexico (K. H. Rechinger 1954). It is closely related to R. occidentalis, differing from that species in having longer pedicels and smaller inner tepals with acute apices. Those characters are highly variable in almost all species of the R. aquaticus aggregate, and the taxonomic status of R. nematopodus remains unclear.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
