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NEEDLE BURR

(Amaranthus spinosus, fam. Amaranthaceae)

Amaranthus spinosus Amaranthus spinosus Amaranthus spinosus Amaranthus spinosus Amaranthus spinosus
Upright annual herb, 50-100cm, stiff red or green stems ribbed lengthwise with characteristic pairs of axillary spines, 5-12mm long, at base of leaf stalks.
Form or habit: Herb
Latex:Absent
Leaf:Simple Alternate

Alternate spearhead shaped on long slender stalks, dark green or occasionally red.

Flower conspicuous: Conspicuous
Flower colour: Greenish-white
Flower description:Small papery, greenish-white, mixed with sharp bracts, borne in dense axillary clusters, often forming long tail-like terminal spikes.
Fruit conspicuous: Conspicuous
Fruit colour:
Fruit: Dry
Fruit description: Small dry 1-seeded fruits, 1-2mm across, surrounded by pale papery leaf-like structures. Seeds erect, shiny black, about 1mm in diameter.
Habitat:
Distribution:
Food source for:
Toxicity:
Origin:Tropical America
Weed:Yes
Weed status:Environmental/garden escapee
Notes:Spread by: Probably by seed in contaminated soil; animals and water.

Invades/threats: Stockyards, wasteland, roadsides, pastures.

Seldom recorded in Mackay Whitsunday Region
Information sources:

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