Caltrop

roadside in volcanic tuff gravels at base of steep, open lower canyon slope

roadside in volcanic tuff gravels at base of steep, open lower canyon slope

roadside in volcanic tuff gravels at base of steep, open lower canyon slope

roadside in volcanic tuff gravels at base of steep, open lower canyon slope

in roadside grasses on silty playa soils adjacent to agricultural area

in roadside grasses on silty playa soils adjacent to agricultural area

in roadside grasses on silty playa soils adjacent to agricultural area

in roadside grasses on silty playa soils adjacent to agricultural area

roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

on roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

on roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

on roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

on roadside wall, at base of silty alluvial terrace slope just above Rio Batopilas

on flats of silty clayish soils with mixed limestone/volcanic rhyolite gravels over white Cretaceous limestone substrate.

on flats of silty clayish soils with mixed limestone/volcanic rhyolite gravels over white Cretaceous limestone substrate.

on flats of silty clayish soils with mixed limestone/volcanic rhyolite gravels over white Cretaceous limestone substrate.

on flats of silty clayish soils with mixed limestone/volcanic rhyolite gravels over white Cretaceous limestone substrate.

view in habitat with Larrea-Fouquieria scrub on volcanic rhyolite flowstone

trailing annual on low exposure of silty, calcareous, gypsophilic clays outcropping in degraded grassland on generally flat plain of limestone gravels and calcareous soil

trailing annual on low exposure of silty, calcareous, gypsophilic clays outcropping in degraded grassland on generally flat plain of limestone gravels and calcareous soil