broad-leaved dock

Rumex obtusifolius

Member of docks (genus Rumex)
knotweed family (family Polygonaceae)
dicots (class Magnoliopsida)
red, other colors in flowering plants

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• perennial
• stem: 6–12(15) dm, generally branched
• leaf: blade 20–40 cm, 10–15 cm wide, base generally cordate, margin generally entire, flat
• inflorescence: branches generally ascending
• pedicels: 2.5–8.5(10) mm, thin
• inner perianth lobe 3–6 mm, 2–3.5 mm wide except teeth, margin generally dentate with 2–5 teeth, 0.5–1.8 mm
• 3 tubercles, 1 larger (2 may be inconspicuous/absent), smooth
• scattered

Toxicity of dock, sorrel (Rumex spp.):
2b – These plants contain oxalate crystals but they do not cause immediate problems. These plants have tiny crystals that lodge in the kidneys and can cause kidney damage as well as nausea, vomiting and diarrhea.

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Chris’s observations: 2 (1 is research grade)

Locations:

• Kauai, HI
• Santa Teresa CP

Months:

• May: 1
• Jun.: 0
• Jul.: 0
• Aug.: 0
• Sep.: 0
• Oct.: 1

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Taxon info: iNaturalist – Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora