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Asteraceae or Compositae (commonly referred to as the aster, daisy, composite,[4] or sunflower family) is an exceedingly large and widespread family of flowering plants (Angiospermae).[5][6] The family has more than 23,600 currently accepted species, spread across 1,620 genera (list) and 13 subfamilies.[citation needed] In terms of numbers of species, the Asteraceae are rivaled only by the Orchidaceae.[5][7] (Which of the two families is actually larger is unclear, owing to uncertainty about exactly how many species exist in each family.) Many members have composite flowers in the form of flower heads (capitula or pseudanthia) surrounded by involucral bracts. When viewed from a distance, each capitulum may have the appearance of being a single flower. The name “Asteraceae” comes from the type genus Aster, from the Greek ἀστήρ, meaning star, and refers to the star-like form of the inflorescence. “Compositae” is an older but still valid name which refers to the fact that the family is one of the few angiosperm ones to have composite flowers.[8]