Four-leaved Allseed (Polycarpon tetraphyllum)

Four-leaved Allseed (Polycarpon tetraphyllum), in various growth forms and densities, another European microherb with colonies around the world. A ubiquitous weed of Melbourne’s urban margins and wasted ground, the form and density of the Polycarpon flower/seed heads is unmistakeable. Judged on the basis of collection records, Allseed appears to have been introduced to South Australia in the 1880s, likely in contaminated seed or other agricultural products, and then brought or blown across the line into Victoria in the 1890s.