Rumex mexicanus
Rumex triangulivalvis
Mexican dock, Mexican willow, Mexican willow or dock
triangular-valve dock, triangular-valved dock, white, white dock, white willow, white willow dock, willow dock
erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60(–90) cm.
ascending or erect, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, (30–)40–100 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.
blades light or yellowish green, veins scarcely prominent abaxially, linear-lanceolate, 6–17 × 1–4(–5) cm, usually ca. 5–6 times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, flat or undulate, 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 or interrupted in proximal 1/2, broadly to narrowly paniculate (branches usually with 2d-order branches, rarely simple).
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 or almost near base, filiform (but slightly thickened distally), 4–8 mm, usually ca. 1.5 times as long as inner tepals, articulation indistinctly 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).
10–25 in whorls;
inner tepals broadly triangular, (2–)2.5–3.5(–3.8) × (2–)2.5–3(–3.5) mm, base truncate or rounded, margins entire or indistinctly erose only near base, apex acute, occasionally subobtuse-triangular;
tubercles usually 3, (1 in some forms, then large, occupying at least 0.5 width of inner tepal), equal or subequal, much narrower than inner tepals glabrous or minutely verrucose.
brown or dark reddish brown, 2–3 × 1.5–2 mm.
brown or dark reddish brown, 1.7–2.2 × 1–1.5 mm.
= 40.
= 20.
Rumex mexicanus
Rumex triangulivalvis
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 triangulivalvis is the most common and widespread species of the R. salicifolius group. It often occurs in ruderal habitats and may be expected outside its present range.
The names Rumex salicifolius and R. mexicanus (in the broad sense) were commonly applied to this species by many North American and European authors.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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