araceae arum flower lilies nature petal pollen spathes stamen white yellow zantedeschia alien foreign garden escape green invader Lysichiton americanus plant skunk cabbage spadix spathe Swamp lantern bad cabbage creepy England garden Lysichiton malodorous odd pungent skunk smelly spike stink strange Sussex unusual weird leaf leaves anthuriums climbers color coloration colorful colour colourful cultivars cylindrical-spike decorative distinctive epiphytes evergreen exotic flamingo-flower flamingo-lily fleshy-spike flora flowerheads flowers glossy herbaceous humidity-loving hybrids inflorescence laceleaf modified-leaf painted-tongue perennials poisonous red shapes shield-shaped shiny smooth species surface surfaces surfacing tail-flower texture textures toxic toxicity tropical waxy