Turk's cap is a common name for several plants and may refer to: Lilium martagon, a lily species native to a wide area from central Europe east to Mongolia and Korea Lilium michauxii, a lily species native to southeastern North America Lilium superbum, a lily species native to eastern and central regions of North America Melocactus, a genus of cactus native to North and South America, many species of which are called Turk's-cap cactus Malvaviscus, a genus of mallows native to North and South America, especially Malvaviscus arboreus and Malvaviscus penduliflorus, called Turk's cap or Turk's-cap mallow
See also Turban squash, a variety of squash also referred to as "Turk's turban"