Tuliptree, bird of paradise, bottlebrush. Common names of commonly seen plants in Berkeley. The names derive from the appearance of each plant. The flowers of the tuliptree, Liriodendron tulipfera , look like tulips. The bird-of-paradise flower, Strelitzia genus, resembles the bird of paradise ( Paradisaeidae family). Obviously the flower of the bottlebrush tree, Callistemon genus, resembles a bottle brush. The 16th century name for the ginkgo ( Ginkgo biloba ) was ya-chio-tzu which means "a tree with leaves like a duck's foot," according to Arthur Plotnick in The Urban Tree Book . Two common names for the catalpa ( Catalpa speciosa ), which I have not seen in Berkeley, are derived from the appearance of the plant's seed pod: cigar tree and Indian bean tree. I think the pods, pictured below, look like a green bean or vanilla bean. Source: USDA Plants Database Another tree with a common name derived from the appearance of its fruit is the syc