They are perennial herbaceous plants which exhibit a multitude of physiological and morphological differences making this a diverse genus. Having native habitats that vary from being epiphytic and saxicolous, species have certain adaptations, such as root systems designed to anchor to other plants or substrates, and modified trichomes for water and nutrient intake. Some of the species, like the majority of bromeliaceae, grow as funnel bromeliads, with a compressed stem axis. The leaves are then close together in rosettes, and cover the lower areas of the leaves, forming a funnel for collecting water. These leaf rosettes, a common physical characteristic in Tillandsia species, collect nutrients and water. The flowers typically involve bright, vibrant colors, with blooms or inflorescences produced on a stalk or several stalks. The flower's color varies greatly; red, yellow, purple and pink flowers exist in this genus, and multicolored flowers are known. The bright colors attract pollinators. An air plant's foliage may also change color when it blooms, also attracting pollinators. The hermaphrodite flowers are threefold with double perianth. The three free sepals are symmetrical and pointed. The seeds have a "parachute" similar to the dandelion. Common pollinators of this genera include moths, hummingbirds and, more recently recognized, bats.