Flaveria trinervia is a species of flowering plant in the family Asteraceae known by the common names clustered yellowtops, speedyweed, and yellow twinstem. It is native to parts of the Americas, including the southeastern and southwestern United States (Florida, Texas, Arizona, New Mexico),Biota of North America Program 2014 county distribution map most of the Bahamas, Mexico, Belize, and parts of the Caribbean, especially Cuba, Cayman Islands, Jamaica, Hispaniola, Puerto Rico and Barbados.Flora of the West Indies It is also known in many other places as an introduced species and often a noxious weed, such as in Hawaii.Marin Life Photography photos in Hawai'iFlora of Zimbabwe
Flaveria trinervia grows easily in many types of wet habitats, including saline and alkaline soils and highly disturbed habitat. This is an annual herb growing erect and known to exceed two meters (7 feet) in height. The lance-shaped to oval leaves are each up to 15 centimeters (8 inches) long and arranged oppositely in pairs around the stem, their bases sometimes fused together. The edges of the leaves generally have tiny widely spaced teeth. The inflorescence is a large dense cluster of many very small flower heads, sometimes over 300 in one cluster. Each flower head contains 0-1 yellow or whitish ray floret and 0-2 yellow disc florets.Flora of North America, Flaveria trinervia (Sprengel) C. Mohr, 1901. Clustered yellowtops Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 628-629 description and commentary in English, distribution map on page 625
This plant exhibits C4 carbon fixation. Phototoxic secondary metabolites have been found in the flower head of (Asteraceae) Flaveria trinervia and bark of Simira salvadorensis.
The Australian species F. australasica is very similar and possibly closely related to F. trinervia. Some authors treat the two as distinct speciesPowell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 629-630 description and commentary in EnglishThe Plant List, Flaveria australasica Hook. while others consider F. australasica as a synonym of F. trinervia.Atlas of Living Australia, Flaveria trinervia (Spreng.) C.Mohr
References
External links Jepson Manual Treatment United States Department of Agriculture Plants Profile photo of herbarium specimen at Missouri Botanical Garden, collected in Nuevo León in 1848 Discover Life