Rumex hesperius

Greene

Pittonia 4: 234. 1901.

Common names: Western willow dock
Treatment appears in FNA Volume 5. Treatment on page 513. Mentioned on page 493, 514.

Plants perennial, glabrous, with vertical rootstock. Stems usually ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–50 (–60) cm. Leaf-blades light or yellowish green, veins scarcely prominent abaxially, elliptic-lanceolate, occasionally lanceolate, 6–12 × (2–) 3–6 cm, usually (2–) 3 (–5) times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, undulate, apex acute, warty in appearance. Inflorescences terminal and axillary, terminal usually occupying distal 1/5–1/3 of stem, dense or interrupted near base, usually broadly paniculate (branches simple or with few 2d-order branches). Pedicels articulated in proximal 1/3, filiform (but thickened distally), 3–6 mm, not more than 2–2.5 times as long as inner tepals, articulation indistinctly swollen. Flowers 10–20 in whorls; inner tepals, triangular, broadly triangular, or deltoid, 3–4 × 3.5–4 (–5) mm, base truncate, margins entire, apex acute or subacute; tubercle 1, small, narrow, much narrower than inner tepals, smooth to weakly rugose. Achenes not seen. 2n = 20.


Phenology: Flowering late spring–early summer.
Habitat: Wet, alluvial habitats: shores, ditches
Elevation: 500-1000 m

Discussion

Rumex hesperius is a little-known species reported only from a localized area in Washington. According to N. M. Sarkar (1958) it is “quite distinct from other species” in its general appearance—a small plant with large, broad leaves and compact inflorescences.

Selected References

None.

Lower Taxa

None.

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

... more about "Rumex hesperius"
unwinged +  and weakly winged +
tan;dark-brown +
pyramidal +, compressed-3-gonous +  and 3-gonous +
yellow +  and brownish yellow +
ovate +  and elongate +
Sergei L. Mosyakin +
Greene +
leafy +  and regular +
not articulated +
cuneate +
crisped;undulate;flat;crisped;undulate;flat +
foliaceous +  and perfoliate +
scale-like +
tuberculate +
just below the soil surface or and above the soil surface +  and spreading +
Western willow dock +
500-1000 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 +
Wet, alluvial habitats: shores, ditches +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
always distinctly wider and longer +
deltoid +  and triangular +
3.5mm +  and 4mm +
nonmembranous +
yellowish green +  and light +
deciduous +
cauline +  and basal +
pubescent +  and glabrous +
undulate +
smaller +
narrower +
swollen +
partly +  and foliaceous +
deciduous +  and persistent +
cylindric +
membranous +
anatropous +, , +  and orthotropous +
2+-2.5 times as long as inner tepals +
accrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
accrescent +
fleshy +, indurate +  and membranous +
Flowering late spring–early summer. +
(2-)3(-4)-carpellate +
50 cm500 mm <br />0.5 m <br /> (60 cm600 mm <br />0.6 m <br />) +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
slender;stout +
not scapose +
decumbent +  and procumbent +
1/5 +  and 1/3 +
plumose +  and fimbriate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
distinct +
reflexed;spreading +
Undefined subg. Lapathum +, Rumex sect. Lapathum +  and Rumex subg. Lapathum +
Rumex hesperius +
Rumex sect. Axillares +
species +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
smooth +  and weakly rugose +
much narrower +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
(2-)3(-5) +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
not coriaceous +
widest;3cm;6cm +
stoloniferous +  and rhizomatous +
10 +, 9 +, 8 +  and 7 +