autumn bulb coast cyprus dune flower head Liliaceae natural nature northern Pancratium maritimum petal plant sand sea daffodil stem white Amaryllidaceae appearance basket-flower beach-spider-lily beautiful-membrane bloom blooming blooms bulbous delicate evergreen exotic hanging-petals hardy herb herbaceous Hymenocallis hymenocallis-littoralis ismene lily long low-maintenance perennial Peruvian-daffodil sacred-lily-of-the-Incas sea-daffodil spectacular spider-lily sub-tropical temperate tropical upright-leaves vigorous-evergreen