Common name: Mistflower, Creeping Crofton Weed
Ageratina riparia (Regel) R.M.King & H.Rob. APNI*
Synonyms: Eupatorium riparium Regel APNI*
Description: Erect, sometimes decumbent herb, 0.3–1 m tall; stems purplish, spreading prostrate in lower parts, rooting at nodes, ± non-glandular hairy.
Leaves lanceolate or narrow-ovate, 3–12 cm long, 8–30 mm wide, apex acuminate, base tapered, lamina glabrous or slightly hairy on veins, prominently veined; petiole to 1.5 cm long.
Heads 5–6 mm diam., crowded in corymbs; involucral bracts oblong-lanceolate, 2-seriate, ± equal, hairy, striate, green to purplish. Florets white.
Achenes 1–2 mm long; hairy, ± only on ribs; pappus bristles 3–4 mm long, barbellate.
Distribution and occurrence: Grows in disturbed damp sites, often in or near rainforest; north from Berry. Native of C Amer.
NSW subdivisions: *NC, *CC, *SC
Other Australian states: *Qld
A declared noxious weed in many shires.
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
***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.