Rumex longifolius
door-yard dock, long-leaf dock, long-leaf or northern or dooryard dock, rumex a feuilles longues, yard dock
erect, branched distal to middle, 50–120(–160) cm.
ocrea deciduous or partially persistent at maturity;
blade broadly lanceolate to ovate-lanceolate or oblong-lanceolate, normally 25–50(–60) × 7–15 cm, ca. 3–4 times as long as wide, base broadly cuneate, rounded-truncate, or slightly cordate, margins entire, undulate or weakly crisped, occasionally flat, apex acute or subacute.
terminal, occupying distal 1/2 of stem, normally dense, narrowly paniculate, branches usually straight or arcuate.
articulated in proximal 1/3, filiform, 4–9 mm, articulation distinctly swollen.
10–20 in whorls;
inner tepals broadly orbiculate or reniform, (4.5–)5–6(–7) × (4.5–)5–7(–7.5) mm, base usually distinctly cordate, margins entire or subentire to very weakly erose, flat, apex obtuse or, rarely, subacute;
tubercles normally absent,sometimes with 1 indistinct tubercle or slightly thickened midvein less than 1–1.3 mm wide.
dark brown or brown, (2.5–)3–3.5(–4) × 1.5–2 mm.
= 60.
Rumex longifolius
Most records of Rumex longifolius from the Great Plains (Great Plains Flora Association 1977; R. B. Kaul 1986) refer to R. pseudonatronatus (J. E. Dawson 1979), which can be distinguished from R. longifolius by its narrower leaves, smaller and more distinctly triangular inner tepals, and purplish or reddish brown stems at maturity. The two species are closely related; they were placed by K. H. Rechinger (1949) in subsect. Longifolii Rechinger f.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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