Common name: Californian Burr
Xanthium orientale L. APNI* Synonyms: Xanthium californicum Greene APNI*
Description: Herb to 2 m high; stems scabrous, unarmed.
Leaves ovate to triangular, 5–14 cm long, 5–15 cm wide, shallowly 3-lobed, base ± cordate, margins toothed, both surfaces green and scabrous, lamina with 3 main veins; petiole 3–8 cm long.
Heads inconspicuous. Burrs ellipsoid, 15–20 mm long, glandular-hairy, with numerous hooked spines 3–5 mm long, beaks diverging, incurved and hooked, 4–6 mm long.
Flowering: summer–autumn.
Distribution and occurrence: Weed, common in wet seasons in pasture, chiefly naturalized in southwestern divisions of the State. Native of Amer.
NSW subdivisions: *SWS, *NWP, *SWP, *SFWP
Other Australian states: *Qld *Vic. *S.A.
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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