Common name: Lacy Ragweed
Ambrosia tenuifolia Spreng. APNI* 
Description: Erect perennial herb to 75 cm high with long runner roots.
Leaves opposite or alternate, bipinnately divided; lobes linear to oblong, usually 2–8 cm long, 4–5 cm wide, covered with long white hairs giving a grey lacy appearance.
Heads light green; female heads 1 or few together, with 1 floret. Bracts united to form a fruit, c. 2 mm long, with a few very short teeth, and with a central beak.
Flowering: spring–summer.
Distribution and occurrence: A weed of roadsides and wasteland, south from Coffs Harbour. Native of S Amer.
NSW subdivisions: *NC, *CC, *SC, *CT, *NWS, *CWS, *SWP, *NFWP
Other Australian states: *Vic. *W.A. *S.A.
A declared noxious weed in some shires.
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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