Common Sheep Sorrel, Red Sorrel, Sheep Sorrel, Sheep-sorrel, Sour Dock: Rumex acetosella (Synonyms: Acetosa acetosella, Acetosa hastata, Acetosella acetosella, Acetosella tenuifolia, Acetosella vulgaris, Acetosella vulgaris, Rumex acetosella ssp. angiocarpus, Rumex acetosella var. pyrenaeus, Rumex acetosella var. tenuifolius, Rumex acetosella var. vulgaris, Rumex angiocarpus, Rumex tenuifolius) -Plants small and slender with numerous, thin spreading roots. Flowers either male or female, never consisting of both sexes together. Leaves arrowhead-shaped with a pair of large lateral lobes at the base of the blade. Weedy species.

Clustered Dock, Sharp Dock: Rumex conglomeratus (Synonym: Rumex acutus) -

Curly Dock, Sour Dock: Rumex crispus (Synonyms: Lapathum crispum, Rumex crispus ssp. crispus) - Plants larger and stouter. Leaf blades tapered at the base, the basal leaves deciduous by flowering time. The blades are 10-30 mm long anmostly less than 5 cm wide. Inner perianth parts heart-shaped and 4-5 mm in diameter.

Wedgeleaf Dock, Wedgelleaved Dock: Rumex cuneifolius (Synonym: Rumex frutescens) - Plants larger and stouter, often forming clumps or patches as the result of many spreading rhizomes. Inner perianth lobes triangular and 4-5 mm in diameter. Leaves leathery, broadly oblanceolate to ovate in shape with crisped margins.

Golden Dock: Rumex maritimus (Synonyms: Lapathum minus, Rumex aureus, Rumex fueginus, Rumex maritimus ssp. fueginus, Rumex maritimus var. athrix, Rumex maritimus var. fueginus, Rumex maritimus var. persicarioides, Rumex persicarioides) - Plants large and stout with taproot and thus not rhizomatous nor spreading.

Bitter Dock: Rumex obtusifolius (Synonyms: Acetosa oblongifolia, Rumex crispatulus, Rumex obtusifolius ssp. agrestis, Rumex obtusifolius ssp. sylvestris, Rumex obtusifolius var. sylvestris, Rumex rugelii) -

Rocky Mountain Western Dock, Western Dock: Rumex occidentalis (Synonyms: Rumex aquaticus ssp. fenestratus, Rumex aquaticus ssp. occidentalis, Rumex aquaticus var. fenestratus, Rumex bakeri, Rumex fenestratus, Rumex fenestratus var. labradricus, Rumex gracilipes, Rumex occidentalis var. fenestratus, Rumex occidentalis var. labradoricus, Rumex occidentalis var. occidentalis, Rumex occidentalis var. procerus) - Large, stout plants with erect stems arising from a taproot (thus not spreading) to 100-200 cm high. Inner perianth parts 4- mm long. Leaves abruptly narrowed to the petiole or heart-shaped at the base.

Patience Dock: Rumex patientia -

Alpine Sheep Sorrel, Alpine Sorrel, Mountain Sorrel: Rumex paucifolius (Synonyms: Acetosa gracilescens, Acetosella paucifolia, Rumex paucifolius ssp. gracilescens) - Flowers either male or female, never consisting of both sexes together. Leaves lacking a wide base, instead tapering at both ends. Mature inner perianth lobes are orbicular and 3-4 mm in diameter.

Fiddle Dock: Rumex pulcher (Synonym: Rumex pulcher ssp. divaricatus) -

Willow Dock: Rumex salicifolius var. angustivalvis - Plants larger and stouter. Leaf blades tapered at the base, the basal leaves persisting at flowering time. Inner perianth lobes 2.5-3 mm at maturity.

Lake Willow Dock: Rumex salicifolius var. lacustris (Synonym: Rumex lacustris) - Plants larger and stouter. Leaf blades tapered at the base, the basal leaves persisting at flowering time. Inner perianth lobes 2.5-3 mm at maturity.

Mexican Dock, Triangular-valved Dock, White Willow Dock: Rumex salicifolius var. mexicanus (Synonyms: Rumex mexicanus, Rumex mexicanus var. angustifolius, Rumex mexicanus var. mexicanus, Rumex mexicanus var. subarcticus, Rumex quadrangulivalvis, Rumex salicifolius ssp. triangulivalvis, Rumex salicifolius var. triangularivalvis, Rumex subarcticus, Rumex triangularivalvis, Rumex triangulivalvis var. oreolapathum) - Plants larger and stouter. Leaf blades tapered at the base, the basal leaves persisting at flowering time. Inner perianth lobes 2.5-3 mm at maturity.

Intermediate Willow Dock, Pacific Willow Dock: Rumex salicifolius var. transitorius (Synonyms: Rumex mexicanus var. transitorius, Rumex transitorius) - Plants larger and stouter. Leaf blades tapered at the base, the basal leaves persisting at flowering time. Inner perianth lobes 2.5-3 mm at maturity.

Utah Dock: Rumex utahensis (Synonym: Rumex salicifolius var. montigenitus) -

Veiny Dock, Winged Dock: Rumex venosus - Plants larger and stouter, often forming clumps or patches as the result of many spreading rhizomes. Inner perianth lobes up to 20-25 mm long at maturity. Leaves leathery and veiny with entire margins.