Rumex densiflorus
dense-flower dock
erect, branched above middle (only in inflorescence), 50–100 cm.
ocrea deciduous or partially persistent at maturity;
blade with large lateral veins alternating with short ones, oblong or oblong-lanceolate, 30–40(–50) × 10–12 cm, more than 3 times as long as wide, base broadly cuneate, truncate, or weakly cordate, margins entire or indistinctly repand, flat, apex obtuse or broadly acute.
terminal, occupying distal 1/2 of stem, usually dense, narrowly paniculate.
articulated in proximal 1/3, filiform, 6–16 mm, articulation indistinct.
10–20 in whorls;
inner tepals ovate-triangular or subcordate, 5–6 × 4.5–6 mm, widest at or near middle, base weakly emarginate, margins entire, erose, or indistinctly denticulate mostly at base, apex abruptly narrowed, acute or subacute;
tubercles absent.
deep brown to reddish brown, 2.5–4(–4.5) × 1.8–2.5 mm.
= 120.
Rumex densiflorus
The following three species are closely related to Rumex densiflorus, all belonging to subsect. Densiflori Rechinger f., and possibly form one polymorphic “macrospecies” (K. H. Rechinger 1937). Á. Löve (1986) treated R. orthoneurus and R. pycnanthus as subspecies of R. densiflorus. However, the variability of this aggregate is insufficiently known, and I prefer to treat it as consisting of four “microspecies.”
Rumex densiflorus is reported from northwestern New Mexico (W. C. Martin and C. R. Hutchins 1980), where it most probably occurs; records for southern Idaho (R. J. Davis 1952) and Arizona (J. H. Lehr 1978) need confirmation.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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