Rumex hymenosepalus |
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Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb |
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Habit | Plants perennial, glabrous or indistinctly papillose-pubescent, with distinctly tuberous roots and short rhizomes. |
Stems | usually erect, rarely ascending, branched above middle, 25–90(–100) cm. |
Leaves | 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. |
Inflorescences | terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple. |
Pedicels | articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct. |
Flowers | 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. |
Achenes | brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm. |
2n | = 40. |
Rumex hymenosepalus |
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Phenology | Flowering spring. |
Habitat | Sandy and rocky places: plains, slopes, stream beds, alkaline soils |
Elevation | 0-1700(-2000) m (0-5600(-6600) ft) |
Distribution |
AZ; CA; CO; MT; NM; NV; OK; TX; UT; WY; Mexico (Baja California, Chihuahua)
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Discussion | 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.) |
Source | FNA vol. 5, p. 515. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Rumex |
Sibling taxa | |
Synonyms | R. arizonicus, R. hymenosepalus var. salinus, R. salinus, R. saxei |
Name authority | Torrey: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 177. (1859) |
Web links |