Gamochaeta purpurea (L.) Cabrera

Spike Cudweed

Bol. Soc. Argent. Bot. 9: 377 (1961) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Annual 10–40(–50) cm high; stems erect to ascending. Leaves rosette at base (persisting in a rosette at flowering), and cauline; rosette leaves spathulate to oblanceolate 1–6 cm long, 5–14 mm wide, rounded to acute, upper surface glabrescent to loosely and sparsely arachnoid, lower surface white with appressed cottony hairs, margins sometimes sinuate; cauline leaves similar but 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, shortly racemose or the lower ones sometimes elongate and then the inflorescence narrowly paniculate. Capitula 4–4.5 mm long, innermost bracts acute, entire, purplish when young, becoming whitish or slightly silvery at maturity; bisexual florets 3–4. Cypselas 0.6–0.7 mm long. Flowers throughout year (mostly Oct.–Feb.).

*CVU, *DunT, *EGL, *EGU, *GipP, *Glep, *Gold, *GGr, *HFE, *HNF, *HSF, *MuF, *MuM, *NIS, *OtP, *OtR, *SnM, *Strz, *VAlp, *VRiv, *VVP, *WaP, *WPro. Probably naturalised all States except NT. Native to the Americas, widely naturalised elsewhere. Native to North, Central America 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.

Source: Walsh, N.G. (1999). Gamochaeta. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Daniel Ohlsen, 2016-01-21
Hero image
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 purpurea in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Gamochaeta purpurea in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present introduced
Glenelg Plain present naturalised
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Murray Fans present naturalised
Gippsland Plain present naturalised
Otway Plain present naturalised
Warrnambool Plain present naturalised
Goldfields present naturalised
Central Victorian Uplands present naturalised
Greater Grampians present naturalised
Dundas Tablelands present naturalised
Northern Inland Slopes present naturalised
East Gippsland Lowlands present naturalised
East Gippsland Uplands present naturalised
Wilsons Promontory present introduced
Highlands-Southern Fall present naturalised
Highlands-Northern Fall present naturalised
Otway Ranges present naturalised
Strzelecki Ranges present naturalised
Highlands-Far East present naturalised
Victorian Alps present naturalised
Snowy Mountains present naturalised

State distribution

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