Lagascea

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Lagascea
Silkleaf (Lagascea mollis) flower in Hyderabad, AP W IMG 7980.jpg
Lagascea mollis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Heliantheae
Subtribe: Helianthinae
Genus: Lagascea
Cav.
Type species
Lagascea mollis
Synonyms [1]
  • LagascaCav., alternate spelling
  • NoccaCav.
  • CalhouniaA.Nelson

Lagascea is a genus of flowering plants in the family Asteraceae. [2] [3] [4] It occurs primarily in Mexico, but some species extend into Central America and one reaches north into the western United States. [5] One species, L. mollis, has been widely introduced to other localities around the tropics and subtropics.

Lagascea is a member of the same subtribe Helianthinae as the common sunflower, Helianthus annuus , but it looks different because it has heads that are reduced to have 1 (or 2) flowers, and are clustered into compound units that mimic heads and are sometimes called syncephalia. [6] The relationships of Lagascea are not well established, but the published work from molecular phylogenetic studies places it as the sister genus to Tithonia . [7] Two of the species are herbs, distinguished from each other by features of the heads, and the remaining species are shrubs and are distinguished primarily by vegetative features.

The genus is named after the Spanish botanist Mariano Lagasca (1776-1839). [8]

Species [1] [9] [10]

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References

  1. 1 2 Flann, C (ed) 2009+ Global Compositae Checklist Archived 2014-12-12 at archive.today
  2. ↑ Cavanilles, Antonio José. 1802. Anales de Ciencias Naturales 6(18): 331–333 in Spanish
  3. ↑ Cavanilles, Antonio José. 1802. Anales de Ciencias Naturales 6(18): plate 44 line drawing of Lagascea mollis
  4. ↑ Tropicos, Lagascea Cav.
  5. ↑ Stuessy, T. F. 1978. Revision of Lagascea (Compositae, Heliantheae). Fieldiana, Botany 38: 75–133.
  6. ↑ Harris, E. M. 1994. Developmental evidence for the derivation of syncephalia in Lagascea (Heliantheae; Asteraceae). American Journal of Botany 81: 1139–1148.
  7. ↑ Schilling, E. E. and J. L. Panero. 1996. Phylogenetic reticulation in subtribe Helianthinae. American Journal of Botany 83: 939-948.
  8. ↑ Genaust, Helmut (1976). Etymologisches Wörterbuch der botanischen Pflanzennamen ISBN   3-7643-0755-2
  9. ↑ The Plant List search for Lagascea
  10. ↑ CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  11. ↑ Biota of North America Program 2013 county distribution map


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