Amaranthus interruptus R.Br.

Species

Angiosperms > Caryophyllales > Amaranthaceae > Amaranthus

Characteristics

Annual, erect or ascending, 40-60 cm long, almost simple or in higher part with (sometimes many) obliquely erect branches, unarmed; stem straight or slightly flexuous, obtusangular, glabrous or very thinly clothed with minute patent hairs. Leaves (larger ones at least) rather long petioled, oblong from long-cuneate base, much narrowed in upper half, obtuse or slightly emarginate, shortly mucronate, with oblique prominent primary lateral nerves; glabrous; larger leaves 3-6 by 1¼-2½ cm. Flower-clusters dense; lower ones axillary; higher ones collected in continuous or more or less interrupted spike; terminal spike simple or branched; flowers in upper part of panicle-branches often exclusively ♂, lower down largely or exclusively ♀; bracts and bracteoles shorter than perianth, mucronate on broadly oval transparent base. Flowers green, all of them (in the Timor-specimen) 5-merous. Tepals of ♂ oblong, acute or minutely mucronate, 1⅓-1½ mm long; tepals of ♀ narrowly spathulate, very shortly mucronate, slightly accrescent with age, 1¼-1¾ mm long. Styles 2-3, erect ⅓-1½ mm. Utricle falling off together with the perianth, broadly ellipsoid, rather thick, in a dried state faintly longitudinally ribbed and rugulose, tipped above the seed with a sharply delimitated, broad, obtuse cone (bearing the unaltered styles), indehiscent or in dried materials bursting irregularly. Seed thick, with an obtuse margin, shining brownish black, ± 1 mm diam.
More
A herb which can be erect or lying down. It can be 60-120 cm tall. The stems are angular. The plant often branches from the base upwards. The leaves are 1.5-4 cm long by 0.7-2 cm wide. The leaf stalk is 0.5-2.5 cm long. The side veins are prominent underneath. The flower cluster can be slightly branched at the base and at the top of the plant. Seed are 1 mm across and rather thick.
Life form annual
Growth form herb
Growth support -
Foliage retention deciduous
Sexuality monoecy
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.5 - 0.9
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

It is a tropical plant. It occurs in the northern parts of Australia and in Papua New Guinea and the Solomon Islands.
Light 7-9
Soil humidity 5-7
Soil texture 3-4
Soil acidity -
Soil nutriment -
Hardiness (USDA) 8-12

Usage

The leaves are used cooked.
Uses food medicinal
Edible leaves seeds
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 10 - 15
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) 19 - 30
Size -
Vigor -
Productivity -

Distribution

Amaranthus interruptus world distribution map, present in Australia, Malaysia, Papua New Guinea, Timor-Leste, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:59542-1
WFO ID wfo-0000530297
COL ID 5TZ9M
BDTFX ID -
INPN ID 446779
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Amaranthus spathulatus Amaranthus lancifolius Amaranthus interruptus Amaranthus lineatus Amaranthus undulatus Amaranthus rhombeus