Rumex hymenosepalus
Rumex krausei
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb
Krause or Cape Krause sorrel, Krause's sorrel
usually erect, rarely ascending, branched above middle, 25–90(–100) cm.
erect or slightly ascending, 1 or several from base, sparsely branched in inflorescence,occasionally inflorescence simple or nearly so, 8–20(–25) cm;
shoots usually densely crowded, not elongated.
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 brownish, membranous;
blade narrowly linear or spatulate-lanceolate, not hastate (without basal lobes), 2.5–6 × 0.15–0.3(–0.4) cm, base narrowly cuneate (gradually narrowing into petiole), margins entire, flat or slightly revolute, apex obtuse or subacute.
terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple.
terminal, occupying distal 1/2 of stem, usually dense, narrowly paniculate with branches directed upward, or simple.
articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct.
1–4 mm.
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.
3–7 in whorls;
inner tepals distinctly enlarged, 2.3–3 × 1.8–3 mm (free wing 0.4–0.8 mm wide), base cuneate, apex obtuse or subacute.
brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm.
light brown, 1.5–2 × 1.2–1.9 mm.
= 40.
= 21.
Rumex hymenosepalus
Rumex krausei
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 name Rumex graminifolius was commonly misapplied to this species in northwestern North America and northeastern Eurasia.
Rumex krausei is closely related to R. beringensis and probably represents the latter’s triploid race. Rumex krausei differs from R. beringensis in having larger flowers, fruiting inner tepals, and fruits, and shorter and less-branched or unbranched inflorescences. Rumex krausei occurs in eastern Chukotka, Russia, together with R. beringensis; however, it is believed to be confined mostly to clay soils and limestones. It has been reported from the Ogotoruk River on the northwestern coast of Alaska (B. A. Jurtzev et al. 1975) and some other Alaskan regions (western Seward Peninsula, capes Dyer and Thompson, and the Squirrel River). It may be expected anywhere within the range of R. beringensis.
of conservation concern
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
PNW Herbaria
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
