Common name: Crofton Weed
Ageratina adenophora (Spreng.) R.M.King & H.Rob. APNI*
Synonyms: Eupatorium adenophorum Spreng. APNI*
Description: Erect, branched herb with glandular and simple multicellular hairs, 1–2 m high, with a short rootstock.
Leaves triangular to rhombic, 4–12 cm long, 3–9 cm wide, apex acute to acuminate, base broad-cuneate, margins crenate to toothed, lamina dark green, slightly hairy or glabrous, veins prominent and hairy; petiole to 4 cm long.
Heads 5–8 mm diam., crowded in corymbs; involucral bracts narrow-lanceolate, 2-seriate, ± equal, glandular, striate, green to reddish. Florets white.
Achenes 1–2 mm long, glabrous; pappus bristles 3–4 mm long, barbellate.
Distribution and occurrence: Grows in disturbed moist sites on fertile soils; north from Kiama. Native of C Amer.
NSW subdivisions: *NC, *CC, *SC, *CT, *NWP, *LHI
Other Australian states: *Qld *S.A.
A declared noxious weed in many shires, suspected of poisoning stock.
Text by M. F. Porteners
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
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