Gamochaeta americana (Mill.) Wedd.


Chlor. Andina 1: 151 (1856) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Annual or biennial, (6–)10–40(–65) cm high; flowering stems usually erect, occasionally ascending, usually branched only at base. Leaves rosetted at base (withering or withered at flowering), and cauline; rosette leaves elliptic-oblong to spathulate, 3–7(–10) cm long, 4–12(–16) mm wide, obtuse to acute, shortly mucronate, upper surface usually glabrous, sometimes with a few scattered cottony hairs, lower surface white to grey-white with appressed cottony hairs, margins usually flat, sometimes undulate; cauline leaves similar but distinctly subclasping (but not auriculate), often slightly decurrent, often folded and progressively smaller and relatively narrower toward (and within) inflorescence. Inflorescence usually narrowly spicate, with numerous contiguous clusters, each subtended by a small leaf, clusters c. sessile or shortly racemose. Capitula 4–4.5 mm long, innermost bracts broadly acute, sometimes nearly rounded, occasionally apiculate, entire, green, sometimes also reddish purple, in middle becoming clear toward margins; bisexual florets 3–6. Cypselas 0.5–0.6(–0.7) mm long. Flowers throughout year (mostly Dec.–Mar.).

*CVU, *EGL, *EGU, *GipP, *GGr, *HFE, *HNF, *HSF, *MuF, *NIS, *OtP, *OtR, *Strz, *VRiv, *VVP, *WPro. Native to Central and South America and the Caribbean Islands. Throughout southern Victoria and along the Murray River and its tributaries, particularly in wet or moist soil (steam banks, ditches etc.), but also in wasteland, gardens, footpaths etc.

Created by: Daniel Ohlsen, 2016-01-21
Updated by: Val Stajsic, 2017-01-11
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Asteranae
order Asterales
family Asteraceae
genus Gamochaeta
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Gamochaeta americana in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Gamochaeta americana in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Murray Fans present introduced
Gippsland Plain present naturalised
Otway Plain present naturalised
Central Victorian Uplands present introduced
Greater Grampians present naturalised
Northern Inland Slopes present naturalised
East Gippsland Lowlands present naturalised
East Gippsland Uplands present naturalised
Wilsons Promontory present naturalised
Highlands-Southern Fall present naturalised
Highlands-Northern Fall present naturalised
Otway Ranges present introduced
Strzelecki Ranges present naturalised
Highlands-Far East present naturalised

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory