Family: Verbenaceae (Verbena family).Native of South America.
Occurrence: Occasional weed along rivers, roadways and railway lines.
The height, and the bright flowers make this a conspicuous weed.
Photo 1: Purple Top. Bruce Street.
2: Specimen from the Loddon River, Baringhup.
3, 4: Purple-top in a weedy section of Bruce St. Castlemaine.