Difference between revisions of "Rumex hymenosepalus"
in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 177. 1859.
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|common_names=Arizona or canaigre dock;wild-rhubarb | |common_names=Arizona or canaigre dock;wild-rhubarb | ||
+ | |special_status={{Treatment/ID/Special_status | ||
+ | |code=F | ||
+ | |label=Illustrated | ||
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|publication title=in W. H. Emory, Rep. U.S. Mex. Bound. | |publication title=in W. H. Emory, Rep. U.S. Mex. Bound. | ||
|publication year=1859 | |publication year=1859 | ||
− | |special status= | + | |special status=Illustrated |
− | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V5/V5_1056.xml |
|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Rumex | |genus=Rumex |
Revision as of 00:28, 28 May 2020
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.
Phenology: Flowering spring.
Habitat: Sandy and rocky places: plains, slopes, stream beds, alkaline soils
Elevation: 0-1700(-2000) m
Distribution
![V5 1056-distribution-map.gif](/w/images/5/56/V5_1056-distribution-map.gif)
Ariz., Calif., Colo., Mont., Nev., N.Mex., Okla., Tex., Utah, Wyo., Mexico (Baja California, Chihuahua).
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.
Selected References
None.