Flaveria trinervia

Flaveria trinervia is a species of flowering plant in the aster family known by the common names clustered yellowtops,[2] speedyweed,[2] and yellow twinstem.[2] It is native to parts of the Americas, including the southeastern and southwestern United States (Florida, Texas, Arizona, New Mexico),[3] most of the Bahamas, Mexico, Belize, and parts of the Caribbean,[4] especially Cuba, Cayman Islands, Jamaica, Hispaniola, Puerto Rico and Barbados.[5] It is also known in many other places as an introduced species and often a noxious weed, such as in Hawaii.[6][7]

Flaveria trinervia
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Flaveria
Species:
F. trinervia
Binomial name
Flaveria trinervia
Synonyms[1]

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.[8][4]

This plant exhibits C4 carbon fixation.

The Australian species F. australasica is very similar and possibly closely related to F. trinervia. Some authors treat the two as distinct species[9][10] while others consider F. australasica as a synonym of F. trinervia.[11]

References
  1. "The Plant List: A Working List of All Plant Species". Retrieved 23 December 2014.
  2. "Flaveria trinervia". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 16 January 2018.
  3. Biota of North America Program 2014 county distribution map
  4. Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 628-629 description and commentary in English, distribution map on page 625
  5. Flora of the West Indies
  6. Marin Life Photography photos in Hawai'i
  7. Flora of Zimbabwe
  8. Flora of North America, Flaveria trinervia (Sprengel) C. Mohr, 1901. Clustered yellowtops
  9. Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 629-630 description and commentary in English
  10. The Plant List, Flaveria australasica Hook.
  11. Atlas of Living Australia, Flaveria trinervia (Spreng.) C.Mohr
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