narthecium flowers used for landscaping purposes on the streets of san francisco bay area, california; narthecium is a eurasian

america american americanum area asphodel bay beautiful bloom blooming blossom bog botanical botany buds california californicum close closeup copy decorative delicate detail eurasian european flora floral flower flowering flowers francisco garden gardening genus herbaceous hybrid landscaping lilly lily nartheciaceae narthecium natural nature north ornamental ossifragum outdoors park plant plants purposes san space states streets summer united usa used yellow