Rumex hymenosepalus |
Rumex conglomeratus |
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Arizona dock, canaigre, canaigre dock, cañaigre dock, wild-rhubarb |
cluster dock, cluster or cluster green dock, green dock, sharp dock |
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Habit | Plants perennial, glabrous or indistinctly papillose-pubescent, with distinctly tuberous roots and short rhizomes. | Plants perennial, normally glabrous, rarely very indistinctly papillose on veins of leaf blades abaxially, with fusiform, vertical rootstock. |
Stems | usually erect, rarely ascending, branched above middle, 25–90(–100) cm. |
erect, branched in distal 2/3 (sometimes with few flowering stems from rootstock), 30–80(–120) 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. |
ocrea deciduous to partially persistent at maturity; blade oblong-lanceolate, obovate-lanceolate, or lanceolate, normally (5–)10–30 × 2.5–6 cm, base broadly cuneate, rounded, or truncate, rarely subcordate, margins entire, flat to very weakly undulate, apex subacute, occasionally obtuse. |
Inflorescences | terminal, occupying distal 1/2 of stem, narrowly paniculate, rarely simple. |
terminal, occupying distal 2/3 of stem, lax, interrupted, broadly paniculate, branches simple or nearly so, almost all but distalmost whorls with subtending leaves; panicle leafy at least in proximal 2/3 of length. |
Pedicels | articulated near middle or in proximal 1/3, filiform, 5–15(–20) mm, articulation indistinct. |
articulated in proximal 1/3 or occasionally near middle, filiform, 1–4(–5) mm, ca. as long as inner tepals or slightly longer, articulation distinctly 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. |
10–20 in dense remote whorls; inner tepals oblong-lanceolate, oblong, or lingulate, 2–3 × 1–1.6(–2) mm, ca. 2 times as long as wide, base cuneate or truncate, margins entire, apex obtuse; tubercles 3, equal or subequal, largest tubercle almost as wide as inner tepal. |
Achenes | brown or reddish brown, 4–5(–7) × 2.5–4.5(–5) mm. |
usually dark reddish brown, 1.5–1.8 × 1–1.4 mm. |
2n | = 40. |
= 20. |
Rumex hymenosepalus |
Rumex conglomeratus |
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Phenology | Flowering spring. | Flowering early summer–early fall. |
Habitat | Sandy and rocky places: plains, slopes, stream beds, alkaline soils | Marshes, wet meadows, shores, alluvial woods, ditches, wet waste places |
Elevation | 0-1700(-2000) m (0-5600(-6600) ft) | 0-1500 m (0-4900 ft) |
Distribution |
AZ; CA; CO; MT; NM; NV; OK; TX; UT; WY; Mexico (Baja California, Chihuahua)
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AL; AR; AZ; CA; GA; IL; IN; KY; LA; MA; MO; MS; NC; NY; OK; OR; PA; SC; TN; TX; VA; WA; WV; BC; Europe; w Asia; sw Asia; n Africa [Introduced in North America; introduced elsewhere]
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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.) |
Rumex conglomeratus often is confused with immature specimens of R. obtusifolius, as well as with other species (e.g., R. sanguineus). Its distribution in North America is insufficiently known, and some literature records may refer to R. obtusifolius. Rumex conglomeratus and R. sanguineus were placed in subsect. Conglomerati Rechinger f. (K. H. Rechinger 1937). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 515. | FNA vol. 5, p. 524. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Rumex | Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Rumex |
Sibling taxa | ||
Synonyms | R. arizonicus, R. hymenosepalus var. salinus, R. salinus, R. saxei | R. acutus |
Name authority | Torrey: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 177. (1859) | Murray: Prodr. Stirp. Gott., 52. (1770) |
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