Rumex venosus
Rumex graminifolius
veiny dock, wild begonia, wing dock
grass-leaf sorrel
ascending or, rarely, erect, usually producing axillary shoots near base, (10–)15–30(–40) cm.
erect or ascending, rarely almost prostrate, branched at base and in distal 1/2 (in inflorescence), 7–30(–40) cm;
shoots not crowded, ± elongated.
blades ovate-elliptic, obovate-elliptic, or ovate-lanceolate, (2–)4–12(–15) × 1–5(–6) cm, subcoriaceous, base narrowly to broadly cuneate, margins entire, flat or slightly undulate, apex acute or acuminate.
ocrea whitish or silvery, membranous;
blade normally narrowly linear, or occasionally linear-lanceolate, usually not hastate, rarely some with indistinct basal lobes, 3–10 × 0.1–0.2(–0.4) cm, base narrowly cuneate, margins entire, flat or occasionally slightly revolute, apex acute or obtuse.
terminal and axillary, usually occupying distal 2/3 of stem/shoot, usually dense, or interrupted in proximal part, broadly paniculate.
terminal, occupying distal 2/3 of stem, usually lax and interrupted to top, paniculate, with branches often reflexed.
articulated near middle, filiform or slightly thickened, (8–)10–16 mm, articulation distinct, slightly swollen.
1–4 mm.
5–15 in whorls;
inner tepals distinctly double-reticulately veined, orbiculate or reniform-orbiculate, 13–18(–20) × (20–)23–30 mm, base deeply emarginate or cordate, margins entire, apex rounded, obtuse, rarely subacute, with short, broadly triangular tip;
tubercles absent, occasionally very small.
(3–)4–6(–8) in whorls;
inner tepals distinctly enlarged, normally 2–2.6 × 1.5–2(–2.2) mm (free wing 0.3–0.5 mm wide), base cuneate, apex obtuse or subacute.
brown or dark brown, 5–7 × 4–6 mm.
brown or yellowish brown, 1.5–2 × 1–1.5 mm.
= 40.
= 56.
Rumex venosus
Rumex graminifolius
Rumex venosus is a distinctive species rarely confused with any other members of the genus. However, I have seen herbarium specimens of it misidentified as R. hymenosepalus, and vice versa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Records of Rumex graminifolius from Alaska in most cases refer to R. beringensis and R. krausei. The occurrence of typical R. graminifolius in northwestern North America remains uncertain. Some literature records of R. acetosella from northeastern North America (Greenland, Labrador, Newfoundland) may refer to R. graminifolius or R. acetosella subsp. arenicola. Rumex graminifolius was reported from Newfoundland also by M. L. Fernald (1950), but that record requires confirmation.
Some plants from northeastern Eurasia (northeastern Russian Far East and northern Siberia) are known in Russian literature as Rumex aureostigmaticus Komarov [Acetosella aureostigmatica (Komarov) Tzvelev], R. acetosella var. subspathulatus Trautvetter, or R. graminifolius var. subspathulatus (Trautvetter) Tolmatchew (see A. I. Tolmachew 1966; N. N. Tzvelev 1989b). They differ from R. graminifolius in having narrower inner tepals and wider spatulate leaves, usually without basal lobes. I have seen only one North American collection approaching this entity. Some specimens (mostly immature or staminate plants) from western Alaska differ from both R. graminifolius and R. beringensis in their habit; they need additional study. Some chromosome counts different from the most typical number (2n = 56) that have been reported for R. graminifolius in the broad sense from northeastern Russian Far East by several Russian authors (see references in Tzvelev) most probably also refer to R. aureostigmaticus. It is also possible that arctic and subarctic plants identified by various authors as R. aureostigmaticus, R. acetosella var. subspathulatus, R. graminifolius var. subspathulatus, and R. acetosella subsp. arenicola belong to one polymorphic complex of plants intermediate between R. acetosella and R. graminifolius.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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