Rumex hymenosepalus
Rumex triangulivalvis
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb
triangular-valve dock, triangular-valved dock, white, white dock, white willow, white willow dock, willow dock
usually erect, rarely ascending, branched above middle, 25–90(–100) cm.
ascending or erect, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, (30–)40–100 cm.
ocrea prominent and persistent at maturity, whitish or silvery white, membranous;
blade oblong, oblong-elliptic, or obovate-lanceolate, (5–)8–30 × 2–8(–12) cm, base cuneate or narrowly cuneate, margins entire, flat or indistinctly crisped, apex acute or acuminate, rarely obtuse.
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, occupying distal 1/2 of stem, narrowly paniculate, rarely simple.
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 near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct.
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.
5–20 in whorls;
inner tepals oblong-cordate or orbiculate-cordate, 11–16 × 9.5–14 mm, base sinuate or emarginate, margins entire, rarely with few extremely small denticles at base, apex obtuse or subacute;
tubercles absent.
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 reddish brown, 4–5(–7) × 2.5–4.5(–5) mm.
brown or dark reddish brown, 1.7–2.2 × 1–1.5 mm.
= 40.
= 20.
Rumex hymenosepalus
Rumex triangulivalvis
Rumex hymenosepalus is the only species of subsect. Hymenosepali Rechinger f.
Two varieties have been recognized. The typical variety has achenes 5 mm and ovate-elliptic or oblong-cordate inner tepals with a subacute apex. Variety salinus (A. Nelson) Rechinger f. has larger achenes (to 7 mm) and almost orbiculate inner tepals with an obtuse apex.
Rumex hymenosepalus was reported also from Montana (J. E. Dawson 1979), but no exact localities were given.
(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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