Lobelia flowers with water drop photographed from my garden, Tucson, Arizona.May, 2013.The genus Lobelia comprises a substantial number of large and small annual, perennial and shrubby species, hardy and tender, from a variety of habitats, in a range of colours. Many species appear totally dissimilar from each other. However, all have simple, alternate leaves and 2-lipped tubular flowers, each with 5 lobes. The upper two lobes may be erect, while the lower three lobes may be fanned out. Flowering is often abundant and the flower colour intense, hence their popularity as ornamental garden subjects.