Common name: Burr Ragweed
Ambrosia confertiflora DC. APNI* 
Description: Erect perennial up to 2 m high and forming large colonies.
Leaves alternate, ± ovate to lanceolate, c. 16 cm long, 10–15 cm wide, bipinnately divided, lobes linear to lanceolate, green to grey-green, finely hairy.
Heads yellow-green; female heads 4 mm diam., abundant in massive clusters, each with 1 or rarely 2 florets. Bracts forming the fruit c. 4 mm long, covered with short hooked spines.
Flowering: summer.
Distribution and occurrence: Weed of roadsides and wasteland in inland areas, potential problem in pastures and irrigated crops, north from Temora district. Native of Amer.
NSW subdivisions: *CWS, *NWP, *NFWP, *SFWP
Other Australian states: *Qld
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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