Rumex hymenosepalus
Rumex utahensis
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb
tooth willow dock, Utah willow dock
usually erect, rarely ascending, branched above middle, 25–90(–100) cm.
usually erect, occasionally ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 15–40(–60) 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 lanceolate or linear-lanceolate, 6–15 × 2–3 cm, usually ca. 4–5 times as long as wide, widest near middle or slightly towards base, usually thin, base cuneate, margin entire, flat, rarely indistinctly 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, dense or occasionally slightly interrupted at base, usually broadly paniculate (branches normally simple and crowded).
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 thickened distally), 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation indistinctly or evidently 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 deltoid or broadly ovate-deltoid, 2.5–3 × 2.5–3 mm, base truncate or indistinctly cordate, margins entire, apex acute, rarely subacute;
tubercles absent.
brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm.
dark reddish brown or almost black, 1.8–2 × 1–1.3 mm.
= 40.
= 40.
Rumex hymenosepalus
Rumex utahensis
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.)
The names Rumex mexicanus and R. salicifolius in the broad sense often have been applied to R. utahensis.
Records of “narrow-leaved forms” of Rumex utahensis from Yukon (E. Hultén 1968) probably refer to R. hultenii Tzvelev (see comments under 27. R. sibiricus) or R. sibiricus in the narrow sense.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
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OR
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