ol la ▁of ▁either ▁a ▁ray ▁flower ▁or ▁of ▁a ▁lig ulate ▁flower . ▁ ▁A ▁disk ▁flower ▁( or ▁disc ▁flower ) ▁is ▁a ▁radial ly ▁symmetric ▁( i . e ., ▁with ▁identical ▁sh aped ▁pet als ▁arranged ▁in ▁circle ▁around ▁the ▁center ) ▁individual ▁flower ▁in ▁the ▁head , ▁which ▁is ▁ring ed ▁by ▁ray ▁flowers ▁when ▁both ▁are ▁present . ▁Sometimes ▁ray ▁flowers ▁may ▁be ▁slightly ▁off ▁from ▁radial ▁symmetry , ▁or ▁weak ly ▁bil ater ally ▁symmetric , ▁as ▁in ▁the ▁case ▁of ▁desert ▁p inc ush ions ▁Cha en act is ▁f rem ont ii . ▁ ▁A ▁radi ate ▁head ▁has ▁disc ▁flowers ▁surrounded ▁by ▁ray ▁flowers . ▁A ▁lig ulate ▁head ▁has ▁all ▁lig ulate ▁flowers . ▁When ▁a ▁sun flow er ▁family ▁flower ▁head ▁has ▁only ▁disc ▁flowers ▁that ▁are ▁ster ile , ▁male , ▁or ▁have ▁both ▁male ▁and ▁female ▁parts , ▁it ▁is ▁a ▁disco id ▁head . ▁Disc iform ▁heads ▁have ▁only ▁disc ▁flowers , ▁but ▁may ▁have ▁two ▁kinds ▁( male ▁flowers ▁and ▁female ▁flowers ) ▁in ▁one ▁head , ▁or ▁may ▁have ▁different ▁heads ▁of ▁two ▁kinds ▁( all ▁male , ▁or ▁all ▁female ). ▁P ist ill ate ▁heads ▁have ▁all ▁female ▁flowers . ▁St amin ate ▁heads ▁have ▁all ▁male ▁flowers . ▁ ▁Sometimes , ▁but ▁rarely , ▁the ▁head ▁contains ▁only ▁a ▁single ▁flower , ▁or ▁has ▁a ▁single ▁flow ered ▁p ist ill ate ▁( f em ale ) ▁head , ▁and ▁a ▁multi -