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Xanthium ambrosioides Hook. & Arn.
Family Asteraceae
Xanthium ambrosioides Hook. & Arn. APNI*

Description: Herb 1 m high, stems very finely pubescent; stems with rigid, 3-pronged spines c. 8–20 mm long at base of leaves.

Leaves lanceolate, 2–4 cm long, 3–10 mm wide, divided into linear segments, surfaces grey, very finely pubescent, lamina with 3 prominent veins; petiole 5–10 cm long.

Heads inconspicuous. Burrs ellipsoid, 4–8 mm long, with long fine hooked spines, c. 2 mm long, sometimes with a short terminal spine.


Flowering: summer–autumn.

Distribution and occurrence: Weed of pastureland, naturalized in the Jerilderie area. Native of S Amer.
NSW subdivisions: *SWP

Declared Noxious Weed
AVH map***

Similar to the more widely spreadX. spinosum..

Text by L. Murray
Taxon concept: Flora of NSW 3 (1992)


APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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