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Rumex venosus

veiny dock, wild begonia, wing dock

Habit Plants perennial, glabrous or nearly so, with creeping rhizomes. Plants perennial, glabrous or indistinctly papillose-pubescent, with fusiform or creeping horizontal rhizome.
Stems

ascending or, rarely, erect, usually producing axillary shoots near base, (10–)15–30(–40) cm.

erect, branched above middle (only in inflorescence), 60–100 cm.

Leaves

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.

ocreae deciduous or partially persistent at maturity;

blade normally oblong-lanceolate, 20–45 × 8–10 cm, normally more than 3 times as long as wide, base broadly cuneate, truncate, or weakly cordate, margins entire, flat or indistinctly crisped, apex obtuse or broadly acute.

Inflorescences

terminal and axillary, usually occupying distal 2/3 of stem/shoot, usually dense, or interrupted in proximal part, broadly paniculate.

terminal, occupying distal 1/2 of stem, often dense, narrowly paniculate.

Pedicels

articulated near middle, filiform or slightly thickened, (8–)10–16 mm, articulation distinct, slightly swollen.

articulated in proximal 1/2, occasionally almost near base, filiform, 3–11 mm, articulation indistinct or weakly evident.

Flowers

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.

10–20 in whorls;

inner tepals ovate-deltoid or ovate-triangular, 4–7 × 3–5 mm, widest at or near base, base truncate or weakly emarginate, margins erose to minutely dentate at least near base, apex narrowly acute;

tubercles absent.

Achenes

brown or dark brown, 5–7 × 4–6 mm.

deep brown to reddish brown, 3–4 × 1.5–2.2 mm.

2n

= 40.

= 120.

Rumex venosus

Rumex pycnanthus

Phenology Flowering spring–early summer. Flowering late spring–summer.
Habitat Sand dunes, sandy and gravelly riverbanks and slopes, deserts, grasslands 200-1500 m Along streams and rivers in montane, subalpine, and alpine zones
Elevation 1700-3000 m [5600-9800 ft]
Distribution
from FNA
AZ; CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WI; WY; AB; MB; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; UT
Discussion

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.)

Rumex pycnanthus was reported (as R. subalpinus M. E. Jones) from White Pine County, Nevada (Mont E. Lewis 1973) and may occur in that state; according to J. T. Kartesz (1987, vol. 1), that record was based on misidentification of R. californicus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Parent taxa Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Axillares Polygonaceae > subfam. Polygonoideae > Rumex > subg. Rumex > sect. Rumex
Sibling taxa
R. acetosa, R. acetosella, R. alpinus, R. altissimus, R. arcticus, R. beringensis, R. britannica, R. brownii, R. bucephalophorus, R. californicus, R. chrysocarpus, R. confertus, R. conglomeratus, R. crassus, R. crispus, R. cristatus, R. cuneifolius, R. densiflorus, R. dentatus, R. ellipticus, R. fascicularis, R. floridanus, R. fueginus, R. graminifolius, R. hastatulus, R. hesperius, R. hymenosepalus, R. kerneri, R. krausei, R. lacustris, R. lapponicus, R. longifolius, R. maritimus, R. mexicanus, R. nematopodus, R. obovatus, R. obtusifolius, R. occidentalis, R. orthoneurus, R. pallidus, R. palustris, R. paraguayensis, R. patientia, R. paucifolius, R. persicarioides, R. praecox, R. pseudonatronatus, R. pulcher, R. pycnanthus, R. salicifolius, R. sanguineus, R. sibiricus, R. spiralis, R. stenophyllus, R. subarcticus, R. thyrsiflorus, R. tomentellus, R. transitorius, R. triangulivalvis, R. utahensis, R. verticillatus, R. violascens
R. acetosa, R. acetosella, R. alpinus, R. altissimus, R. arcticus, R. beringensis, R. britannica, R. brownii, R. bucephalophorus, R. californicus, R. chrysocarpus, R. confertus, R. conglomeratus, R. crassus, R. crispus, R. cristatus, R. cuneifolius, R. densiflorus, R. dentatus, R. ellipticus, R. fascicularis, R. floridanus, R. fueginus, R. graminifolius, R. hastatulus, R. hesperius, R. hymenosepalus, R. kerneri, R. krausei, R. lacustris, R. lapponicus, R. longifolius, R. maritimus, R. mexicanus, R. nematopodus, R. obovatus, R. obtusifolius, R. occidentalis, R. orthoneurus, R. pallidus, R. palustris, R. paraguayensis, R. patientia, R. paucifolius, R. persicarioides, R. praecox, R. pseudonatronatus, R. pulcher, R. salicifolius, R. sanguineus, R. sibiricus, R. spiralis, R. stenophyllus, R. subarcticus, R. thyrsiflorus, R. tomentellus, R. transitorius, R. triangulivalvis, R. utahensis, R. venosus, R. verticillatus, R. violascens
Synonyms R. subalpinus, R. densiflorus subsp. pycnanthus
Name authority Pursh: Fl. Amer. Sept. 2: 733. (1813) Rechinger f.: Repert. Spec. Nov. Regni Veg. 38: 372. (1935)
Source FNA vol. 5, p. 505. Treatment author: Sergei L. Mosyakin. FNA vol. 5, p. 516. Treatment author: Sergei L. Mosyakin.
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