Lantana () is a genus of about 150 species of perennial flowering plants in the verbena family, Verbenaceae. They are native to tropical regions of the Americas and Africa but exist as an introduced species in numerous areas, especially in the Australian-Pacific region, South and Northeastern part of India. The genus includes both herbaceous plants and shrubs growing to tall. Their common names are shrub verbenas or lantanas. The generic name originated in Late Latin, where it refers to the unrelated Viburnum lantana.
Lantana's aromatic flower clusters (called umbels) are a mix of red, orange, yellow, or blue and white florets. Other colors exist as new varieties are being selected. The flowers typically change color as they mature, resulting in inflorescences that are two- or three-colored.
"Wild lantanas" are plants of the unrelated genus Abronia, usually called "sand-verbenas".
Ecology
Some species are invasive, and are considered to be noxious weeds, such as in South Asia, Southern Africa and Australia. In the United States, lantanas are naturalized in the southeast, especially coastal regions of the Carolinas, Georgia, Florida, and the Gulf Coast.
The spread of lantana is aided by the fact that their leaves are poisonous to most animals and thus avoided by herbivores, while their fruit is a delicacy for many birds, including the yellow-fronted white-eye of Vanuatu, the superb fairy-wren in Australia, the scaly-breasted munia, and the Mauritius bulbul in the Mascarenes; these distribute the seeds and thereby unwittingly contribute to the degradation of their home ecosystem.
Biological control of introduced lantanas has been attempted, without robust success. In Australia, about 30 insects have been introduced in an attempt to control the spread of lantanas, and this has caused problems of its own. The lantana bug (Aconophora compressa) for example is a polyphagous species introduced in 1995 that feeds on dozens of plants, and not only has it failed to have a noticeable impact on the lantana population, it has even become a pest in horticulture, parasitizing the related fiddlewoods (Citharexylum). The small Lantana-feeding moths Epinotia lantana and Lantanophaga pusillidactyla, while not becoming pests, have nonetheless failed to stem the spread of the invasive weed, as has the lantana scrub-hairstreak butterfly (Strymon bazochii) which was introduced to control lantanas on the Hawaiian Islands.
Other Lepidoptera whose caterpillars feed on lantana species include the common splendid ghost moth (Aenetus ligniveren), Aenetus scotti, Endoclita malabaricus, Hypercompe orsa and the setaceous Hebrew character (Xestia c-nigrum). The swamp wallaby (Wallabia bicolor) is one of the few mammals that eat lantana leaves without apparent ill effect.
Lantanas are useful as honey plants, and Spanish flag (L. camara), L. lilacina and L. trifolia are sometimes planted for this purpose, or in butterfly gardening. Butterflies which are attracted to lantana flowers are most notably Papilioninae (swallowtail and birdwing butterflies). Hesperiidae (skippers) and certain brush-footed butterflies (namely Danainae and Heliconiinae), as well as some Pieridae (e.g. cloudless sulphur, Phoebis sennae), Lycaenidae (e.g. the aforementioned lantana scrub-hairstreak), and Nymphalidae (e.g. Greta oto) also like to visit the plants' flowers. Consequently, as total eradication of Lantana seems often impossible, it may in many cases be better to simply remove plants with immature (green) fruit to prevent them from spreading.
Some weaverbirds such as the black-throated weaver (Ploceus benghalensis) and the streaked weaver (P. manyar) highly value Lantana flowers for decorating their nests. An ability to procure spectacular and innovative decorations appears to be desired by females, and consequently is an indicator of the males' fitness.
In Australia it has been found that removing Lantana from urban greenspaces can have negative impacts on bird diversity locally, as it provides refuge for species like the superb fairy (Malurus cyaneus) and silvereye (Zosterops lateralis) in the absence of native plant equivalents. There seems to be a density threshold in which too much Lantana (thus homogeneity in vegetation cover) can lead to a decrease in bird species richness or abundance.
Ceratobasidium cornigerum is a higher fungus which parasitizes Lantana among other plants. The sweet potato whitefly (Bemisia tabaci) is a common greenhouse pest and is often distributed with infested lantanas.