Common name: South American Burr
Xanthium cavanillesii Schouw APNI* 
Description: Herb to 1 m high; stems scabrous, not spinose.
Leaves very broad-ovate or triangular, 5–12 cm long, 5–12 cm wide, usually slightly longer than broad, shallowly and unevenly lobed, toothed, base cordate, both surface scabrous, lamina with 3 main veins; petiole 4–12 cm long.
Heads inconspicuous. Burrs ellipsoid, 15–30 mm long, glandular hairy, with numerous hooked spines mostly 5–8 mm long, beaks diverging, straight, mostly hooked, 6–8 mm long.
Flowering: summer–autumn.
Distribution and occurrence: Grows mostly along river banks; recorded for Sydney, Windsor and Upper Hunter districts. Native of Amer.
NSW subdivisions: *CC, *CWS, *SWP
Hybridizes with X. occidentalei.
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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