Rumex nematopodus

Rechinger f.

Leafl. W. Bot. 7: 134. 1954.

Synonyms: Rumex aquaticus subsp. nematopodus (Rechinger f.) Á. Löve
Treatment appears in FNA Volume 5. Treatment on page 519. Mentioned on page 494, 518.

Plants perennial, glabrous or nearly so, with fusiform, vertical rootstock. Stems erect, branched in distal 1/2, 40–85 (–100) cm. Leaves: ocrea deciduous or partially persistent at maturity; blade oblong-lanceolate to lanceolate, 20–35 × 5–12 cm, base cordate to broadly cuneate, margins entire or nearly so, flat, apex acute or attenuate. Inflorescences terminal, occupying distal 1/2–2/3 of stem, interrupted in proximal 1/2, paniculate, branched. Pedicels articulated in proximal 1/3, filiform, 12–20 mm, 3–4 times as long as inner tepals, articulation weakly evident, not swollen. Flowers 10–20 in whorls; inner tepals ovate-triangular, 4–5 (–6) × 3–4 (–5) mm, base truncate to subcordate, margins entire, apex acute to subacute; tubercles absent. Achenes brown, 3 × 1.5 mm. 2n = 120.


Phenology: Flowering spring–early summer.
Habitat: Seasonally wet habitats along rivers and streams
Elevation: 2500-3000 m

Distribution

V5 1065-distribution-map.gif

Ariz., N.Mex., n Mexico (Chihuahua)

Discussion

Rumex nematopodus has been reported from several localities in Arizona, New Mexico, and northern Mexico (K. H. Rechinger 1954). It is closely related to R. occidentalis, differing from that species in having longer pedicels and smaller inner tepals with acute apices. Those characters are highly variable in almost all species of the R. aquaticus aggregate, and the taxonomic status of R. nematopodus remains unclear.

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property."-4timesaslongasinnertepals" is not declared as a valid unit of measurement for this property.

... more about "Rumex nematopodus"
unwinged +  and weakly winged +
3 cm30 mm <br />0.03 m <br /> (?) +
pyramidal +, compressed-3-gonous +  and 3-gonous +
yellow +  and brownish yellow +
ovate +  and elongate +
acute;subacute +
Sergei L. Mosyakin +
Rechinger f. +
not articulated +
truncate +  and subcordate +
20 cm200 mm <br />0.2 m <br /> (35 cm350 mm <br />0.35 m <br />) +
oblong-lanceolate;lanceolate +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
foliaceous +  and perfoliate +
scale-like +
tuberculate +
just below the soil surface or and above the soil surface +  and spreading +
Ariz. +, N.Mex. +  and n Mexico (Chihuahua) +
2500-3000 m +
free +  and distinct +
unisexual +, bisexual +  and , +
disarticulating +  and solid +
decumbent to erect +  and prostrate +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
Seasonally wet habitats along rivers and streams +
branched +  and interrupted +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
always distinctly wider and longer +
ovate-triangular +
3mm +  and 4mm +
nonmembranous +
deciduous +
cauline +  and basal +
entire +  and nearly +
pubescent +  and glabrous +
entire +, orbiculate +  and linear +
smaller +
narrower +
swollen +
partly +  and foliaceous +
persistent +  and deciduous +
cylindric +
membranous +
anatropous +, , +  and orthotropous +
accrescent +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
spreading;erect +
red;pinkish;red;pinkish;green +
campanulate +
accrescent +
fleshy +, indurate +  and membranous +
Flowering spring–early summer. +
(2-)3(-4)-carpellate +
Leafl. W. Bot. +
slender;stout +
85 cm850 mm <br />0.85 m <br /> (100 cm1,000 mm <br />1 m <br />) +
papillose-pubescent +  and glabrous +
1/2 +  and 2/3 +
40 cm400 mm <br />0.4 m <br /> (85 cm850 mm <br />0.85 m <br />) +
plumose +  and fimbriate +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
distinct +
reflexed;spreading +
spreading;erect +
Rumex aquaticus subsp. nematopodus +
Rumex nematopodus +
Rumex sect. Rumex +
species +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
stoloniferous +  and rhizomatous +
nearly +  and glabrous +
10 +, 9 +, 8 +  and 7 +