Rumex hymenosepalus
Rumex brownii
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb
Brown's dock
usually erect, rarely ascending, branched above middle, 25–90(–100) cm.
erect or ascending, divaricately branched in distal 1/2–2/3, 30–80(–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 deciduous or partially persistent;
blade shape variable, oblong to lanceolate or lanceolate-linear, often panduriform, contracted near or proximal middle, (3–)5–15(–17) × 1–3(–5) cm, base truncate, slightly cordate, or broadly cuneate, margins entire, normally slightly undulate and crisped, apex acute or subobtuse.
terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple.
terminal, occupying distal 2/3 or most of stem, lax, interrupted in proximal part or throughout, broadly paniculate, branches spreading.
articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct.
articulated in proximal 1/3, filiform (occasionally thickened distally), 2.5–5 mm, usually as long as or slightly longer than inner tepals, articulation distinctly 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.
5–8(–10) in rather lax remote whorls;
inner tepals broadly to narrowly triangular, 2.5–4 × 1.5–2.3 mm (excluding teeth), base truncate or broadly cuneate, margins prominently dentate, apex acute and ending in hooked tooth, teeth 3–5, at each side of margins, hooked, 0.5–1.5 mm;
tubercles absent, or midveins indistinctly swollen.
brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm.
reddish brown, 1.8–2.3 × 1.2–1.5 mm.
= 40.
= 20.
Rumex hymenosepalus
Rumex brownii
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 brownii, an uncommon “wool alien” in North America, was collected in South Carolina in the late 1950s (J. E. Dawson 1979). It is uncertain if it persists there. It occasionally occurs in Europe as a casual alien. This species is a member of subsect. Acrancistron Rechinger f. (see K. H. Rechinger 1984), which includes two Australian species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
