Rumex hymenosepalus |
Rumex spiralis |
|
---|---|---|
Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb |
spiral tall dock, wing dock |
|
Habit | Plants perennial, glabrous or indistinctly papillose-pubescent, with distinctly tuberous roots and short rhizomes. | Plants perennial, glabrous, with creeping rhizomes. |
Stems | usually erect, rarely ascending, branched above middle, 25–90(–100) cm. |
ascending or erect, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 50–90 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. |
blades ovate-lanceolate, oblong-lanceolate, or lanceolate, 10–15 × 3–5.5 cm, usually 2.5–3.5 times as long as wide, widest in proximal 1/3, thick, usually not coriaceous, base broadly cuneate, truncate, or rounded, margins entire, flat or slightly undulate-crisped, apex acute or attenuate. |
Inflorescences | terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple. |
terminal and axillary, terminal usually occupying distal 1/2 of stem, dense, narrowly to broadly paniculate (branches usually simple). |
Pedicels | articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct. |
articulated in proximal 1/3, thin but slightly thickened distally, (2–)3–7(–8) mm, usually as long as or shorter than inner tepals, articulation slightly swollen. |
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. |
12–20 in whorls; inner tepals broadly cordate or broadly ovate-deltoid, 7–10 × 8–12 mm, base deeply and broadly cordate, margins entire, apex acuminate; tubercles 3, equal or subequal, usually minutely to distinctly rugose. |
Achenes | brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm. |
brown or dark reddish brown, 2.5–3.5 × 2–2.5 mm. |
2n | = 40. |
= 20. |
Rumex hymenosepalus |
Rumex spiralis |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Sandy and rocky places: plains, slopes, stream beds, alkaline soils | Sandy and gravelly shores |
Elevation | 0-1700(-2000) m (0-5600(-6600) ft) | 0-200 m (0-700 ft) |
Distribution |
AZ; CA; CO; MT; NM; NV; OK; TX; UT; WY; Mexico (Baja California, Chihuahua)
|
TX |
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.) |
Rumex spiralis is related to R. altissimus; however, it is geographically restricted and morphologically distinct. It has inner tepals larger than those of any other member of subsect. Salicifolii and distinctly wider leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 515. | FNA vol. 5, p. 507. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Rumex | Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Axillares |
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) | Small: Bull. Torrey Bot. Club 22: 44, plate 228. (1895) |
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