Rumex mexicanus
Rumex kerneri
Mexican dock, Mexican willow, Mexican willow or dock
Kerner's dock
erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30–60(–90) cm.
erect, branched from above middle or in distal 2/3, 50–100(–150) cm.
blades light green to yellowish green, linear-lanceolate, occasionally lanceolate, 6–14 × 1–3.5(–4) cm, usually ca. 5–7 times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, flat or undulate, apex acute or attenuate.
ocrea deciduous or partially persistent at maturity;
blade broadly lanceolate to oblong-lanceolate, normally 15–25 × 5–9 cm, base truncate or slightly cordate, margins entire, undulate or weakly crisped, occasionally flat, apex acute or attenuate.
terminal and axillary, terminal usually occupying distal 1/5–1/3 of stem, rather dense or interrupted in proximal 1/2, usually broadly paniculate (branches simple or with few 2d-order branches).
terminal, occupying distal 1/2–2/3 of stem, normally dense or interrupted near base, broadly paniculate (branches mostly simple or nearly so), branches usually straight or arcuate, rarely indistinctly flexuous.
articulated in proximal 1/3 or almost near base, filiform (thickened distally), 4–7 mm, not more than 2–2.5 times as long as inner tepals, articulation indistinctly swollen.
articulated near middle, filiform, 6–12 mm, articulation distinctly swollen.
10–20 in whorls;
inner tepals broadly ovate-triangular, occasionally broadly triangular, 3.5–4.5(–5) × 3.5–4(–5) mm, base truncate or indistinctly cordate, margins entire or indistinctly erose, apex obtuse or subacute;
tubercles 3, equal or subequal (much narrower than inner tepals).
15–20 in whorls;
inner tepals orbiculate, 6–8(–9) × 6–7.5(–8) mm, base usually distinctly cordate, margins entire or subentire near apex, denticulate or dentate near base, apex acute or subacute, teeth to 0.5 mm;
tubercle normally 1 (rarely 3, then distinctly unequal), less than 2 times as wide as inner tepals.
brown or dark reddish brown, 2–3 × 1.5–2 mm.
dark brown or brown, 2.5–3.3 × 1.8–2.3 mm.
= 40.
= 80.
Rumex mexicanus
Rumex kerneri
Some authors recognize Rumex mexicanus in the broad sense, including in it many other taxa treated here as separate entities. For consistency, the entities of the R. salicifolius aggregate that are recognized herein are kept separate pending additional taxonomic research.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Rumex kerneri is known in North America only from California, where it occurs mostly in Santa Barbara and San Luis Obispo counties. It is closely related to and has been regarded as a subspecies of R. cristatus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
CA
