Lamarckia is a Eurasian and African plant in the grass family. Species The only known species is Lamarckia aurea, the golden dog's-tail or goldentop grass It is an annual plant, typically 30-45 centimetres in height, with clusters of golden flowers in a panicle 5–8 cm long and 2-2.5 cm broad. The species is native to the Mediterranean Basin and neighboring regions from Portugal to the Canary Islands east to Ethiopia and northern India. It is also naturalized in parts of Australia and the Americas, considered an invasive weed in some areas. formerly included see Aegopogon