Rumex hymenosepalus
Rumex palustris
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb
marsh dock
usually erect, rarely ascending, branched above middle, 25–90(–100) cm.
erect, normally branched in distal 2/3, occasionally almost near base, 10–60(–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.
ocrea normally deciduous, rarely partially persistent at maturity;
blade lanceolate or oblong-lanceolate, gradually narrowed at both ends, (10–)15–30(–35) × 1.5–6 cm, more than 4 times as long as wide, base narrowly to broadly cuneate, margins entire, flat or, rarely, weakly undulate, apex acute, rarely subobtuse.
terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple.
terminal, occupying distal 1/2 of stem, rarely more, reddish brown at maturity, usually lax, interrupted in proximal 1/2 or 2/3, broadly paniculate;
branches spreading.
articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct.
articulated near base or at least in proximal 1/3, filiform, 3–6 mm, articulation weakly evident.
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.
15–25(–30) in rather dense whorls;
inner tepals narrowly triangular, narrowly rhombic-triangular, or linguliform, (2.5–)3–3.5(–4) × 1.2–1.5(–2) mm (excluding teeth), normally ca. 2 times as long as wide, base truncate or broadly cuneate, margins prominently dentate, apex acute very rarely subacute, straight, teeth (1–)2–3, normally at each side of margins, subulate-filiform, bristlelike, straight, 1–2(–3) mm, usually as long as width of inner tepals;
tubercles 3, equal or subequal, apex obtuse, smooth.
brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm.
light brown, 0.9–1.75 × 0.6–1 mm.
= 40.
= 60.
Rumex hymenosepalus
Rumex palustris
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 palustris was reported for the first time from North America by J. E. Dawson (1979) based on specimens misidentified as R. maritimus and R. pulcher, collected in 1877 and 1959, respectively. Rumex palustris is not known to be invasive, and these collections probably represent only occasional, chance introductions.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
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SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
