Xanthium strumarium
A large, broad-leaved annual of moist ground, with bur-like pistillate pseudanthia.
A fruiting plant in Percha Box, west of Truth or Consequences, 5 Oct 2008.
Another fruiting plant in Percha Box, 5 Oct 2008. The little brown spheres at the apex of the plant are staminate pseudanthia.
Pistillate pseudanthia in Percha Box, 5 Oct 2008.
A staminate pseudanthium with young pistillate pseudanthia, identifiable by their exserted styles. Percha Box, 5 Oct 2008.