Robert K. Jansen

Acmella oleracea is a species of flowering herb in the family Asteraceae. Common names include toothache plant, Szechuan buttons, paracress, jambu, buzz buttons, tingflowers and electric daisy. Its native distribution is unclear, but it is likely derived from a Brazilian Acmella species. A small, erect plant, it grows quickly and bears gold and red inflorescences. It is frost-sensitive but perennial in warmer climates. Its specific epithet oleracea means "vegetable/herbal" in Latin and is a form of holeraceus (oleraceus).

Barnadesioideae is a subfamily of flowering plants in the aster family, Asteraceae. It comprises a single tribe, the Barnadesieae. The subfamily is endemic to South America. Molecular evidence suggests it is a basal clade within the family, and it is monophyletic. The subfamily includes species of annual and perennial herbs, shrubs, and trees up to 30 meters tall. Most are likely pollinated by hummingbirds.

Bajacalia is a genus of three flowering plants in the family Asteraceae. The genus was erected in 2003 to house two species moved from genus Porophyllum, now named Bajacalia tridentata and B. crassifolia. The third was newly described at the time and named Bajacalia moranii. These plants are near-endemic to the Baja California peninsula in Mexico (States of Baja California and Baja California Sur); one species (B. crassifolia) also has been found on Tiburón Island, part of Sonora. They have succulent leaves and yellow flowers.

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Squamopappus is a genus of Mesoamerican plants in the tribe Heliantheae within the family Asteraceae. The only known species is Squamopappus skutchii native to Chiapas and Guatemala.

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Acmella pilosa, the hairy spotflower, is a Mesoamerican species of flowering plants in the family Asteraceae. It is native to Guatemala, Belize, and southeastern Mexico (Campeche, Quintana Roo, Tabasco). The species is also naturalized in the southern part of the US State of Florida.

Acmella alba is a species of plant belonging to the family Asteraceae. Common names include brede mafane, spilanthes, tingflower, toothache plant, electric daisy, and buzz buttons. The flowers and leaves contain spilanthol, a local anesthetic.

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Acmella pusilla, the dwarf spotflower, is a species of flowering herb in the family Asteraceae. The plant is native to South America (Brazil, Argentina, Paraguay, Uruguay, etc.) and is naturalized in the southeastern United States (Florida, Georgia, North and South Carolina).

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Acmella leucantha is a species of flowering plant in the family Asteraceae. It is endemic to Ecuador, where it is known from three locations in the Andes and one on Puná Island. The Andean subpopulations grow in forests and the dry vegetation of mountain valleys. The island subpopulation occurs in coastal habitat. The species is threatened by habitat destruction, including deforestation on Puná Island.

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