Rheum nobile Hook.F. & Thomson

Species

Angiosperms > Caryophyllales > Polygonaceae > Rheum

Characteristics

Herbs large, 1-2 m tall. Roots and rhizomes stout, ca. 8 cm in diam. Stem erect, finely striped, stout, 2-3 cm in diam., glabrous, simple. Basal leaves in a rosette. Stem leaves dense; petiole stout, shorter than blade, 5-15 cm, glabrous; leaf blade large, orbicular, ovate, or cordate-ovate, 20-30 cm, nearly lea-thery, abaxially glabrous or pilose, adaxially glabrous, basal veins 5-7, conspicuously raised abaxially, base rounded or subcordate, margin entire, apex obtuse; distal leaves smaller upward, orbicular, 5-13 cm; ocrea red, broadly lanceolate, large, 10-15 cm, both surfaces glabrous. Panicle 5-8-branched, 5-9 cm, rarely with branchlets, glabrous; bracts light yellow, membranous when dry. Pedicel 2-3 mm, slender, jointed at middle or slightly below. Flowers 5-9-fascicled. Tepals 6 or fewer, connected at base, not spreading, elliptic, inner 3 larger, yellow-green, ca. 2 × 1 mm. Stamens (8 or)9; anthers compressed, oblong-elliptic; filaments compressed, base inflated, 3-3.5 mm. Ovary ovoid; style short; stigma inflated. Fruit broadly ovoid or ovoid, 6-7 × 5-6 mm, base rounded to slightly truncate, apex obtuse; wings dark brown, less than 1 mm, narrow, with longitudinal veins near margin. Seeds black-brown, cordate-ovoid. Fl. Jun-Jul, fr. Sep.
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A herb. It grows to about 1.5 m high. It is densely covered with bracts which are pale and bend backwards. The leaves have stalks. The leaves are about 30 cm long and wide. They are oval or round. The base can be heart-shaped. The flowers are cream. These are hidden by the bracts. The fruit is dry and oval.
Life form perennial
Growth form herb
Growth support -
Foliage retention deciduous
Sexuality hermaphrodite
Pollination anemogamy
Spread -
Mature width (meter) 1.0
Mature height (meter) 1.5
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway -

Environment

Rock ledges; at elevations around 4,000 metres. Open alpine grassy and rocky slopes, morainic deposits; at elevations around 3,600-5,000 metres.
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A subtropical plant. In Nepal it grows between 3900-4300 m altitude. It often grows amongst rocks.
Light 4-9
Soil humidity 4-6
Soil texture 1-4
Soil acidity 3-7
Soil nutriment -
Hardiness (USDA) 7-9

Usage

The leaf stalks are peeled then eaten raw or pickled. The young flowering stalks are cooked and eaten.
Uses environmental use medicinal ornamental
Edible flowers leaves stems
Therapeutic use Fumitory (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Plants are grown by seeds or root offshoots.
Mode divisions seedlings
Germination duration (days) 21 - 42
Germination temperacture (C°) 15 - 18
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Rheum nobile leaf picture by Alan Elliott (cc-by-sa)

Flower

Rheum nobile flower picture by Alan Elliott (cc-by-sa)

Distribution

Rheum nobile world distribution map, present in Bhutan, China, India, Myanmar, and Nepal

Identifiers

LSID urn:lsid:ipni.org:names:696766-1
WFO ID wfo-0001101426
COL ID 4S6BC
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Rheum nobile