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Facelis retusa, the annual trampweed,[2] is a South American species flowering plants in the family Asteraceae. It is native Brazil, Bolivia, Paraguay, Uruguay, northern Argentina, Chile; naturalized in parts of Africa,[3] Australia, and North America including the southeastern and south-central United States, and considered as a noxious weed in some of those places.[4][5][6][7]

Facelis retusa
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Facelis
Species:
F. retusa
Binomial name
Facelis retusa
(Lam.) Sch.Bip.
Synonyms[1]
  • Facelis apiculata Cass.
  • Gnaphalium retusum Lam. 1788
  • Pteropogon andicola Nees

Facelis retusa is an annual herb with the stems up to 30 cm (1-foot) long, very often trailing along the surface of the ground. Leaves are crowded along the stem, each up to 3 cm (1 in) long. Flower heads are in clusters, with white or purple disc flowers but no ray flowers. The achene has several long, feathery bristles that give a white appearance and assure effective seed dispersal.[8]


References


  1. The Plant List, Facelis retusa (Lam.) Sch.Bip.
  2. USDA, NRCS (n.d.). "Facelis retusai". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 14 July 2015.
  3. Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
  4. Biota of North America Program 2014 county distribution map
  5. Frank M. Watson, University of Georgia, College of Agricultural and Environmental Sciences, Weed covers turfgrass with snowy appearance
  6. Tropicos, Facelis retusa (Lam.) Sch. Bip.
  7. Atlas of Living Australia
  8. Flora of North America, Facelis Cassini, 1819.



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