Xylothamia

Xylothamia, the desert goldenrods,[1] is a genus of flowering plants in the family Asteraceae.[2][3][4][5] Until 2003, it was held to contain nine species of shrubs native to deserts of Mexico and the southwestern United States.[6] However, it seems to contain at least two groups. Four species are related to Gundlachia and may be moved to that genus. Plants of the World Online (part of the Royal Botanic Gardens, Kew) class it as a synonym of Gundlachia.[7] The relationships of the other five species is not quite as clear. All nine species do belong in the subtribe Solidagininae.[6]

Xylothamia
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Astereae
Subtribe: Gutiereziinae
Genus: Xylothamia
G.L.Nesom, Y.B.Suh, D.R.Morgan & B.B.Simpson

Species

The following four species, including the type species Xylothamia triantha, are related to each other and to Gundlachia:[6]

  • Xylothamia diffusa
  • Xylothamia riskindii
  • Xylothamia triantha
  • Xylothamia truncata

Kew lists Gundlachia diffusa Gundlachia triantha and Gundlachia truncata.[8]

The following three species are related to each other and to Bigelowia and Thurovia:[6]

  • Xylothamia pseudobaccharis
  • Xylothamia parrasana
  • Xylothamia purpusii

Due to molecular evidence, these 3 species were transferred to genus Medranoa in 2007; as Medranoa pseudobaccharis, Medranoa parrasana and Medranoa purpusii.[9]

The following two species are related to each other:[6]

  • Xylothamia johnstonii
  • Xylothamia palmeri

References
  1. USDA, NRCS (n.d.). "Xylothamia". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 7 August 2015.
  2. Botanic Garden and Botanical Museum Berlin-Dahlem. "Details for: Astereae". Euro+Med PlantBase. Freie Universität Berlin. Retrieved 2009-07-18.
  3. UniProt. "Tribe Astereae". Retrieved 2009-07-18.
  4. National Herbarium of New South Wales. "Genus Kippistia". New South Wales FloraOnline. Royal Botanic Gardens, Sydney. Retrieved 2009-07-18.
  5. "Polyarrhena Cass". African Plants Database. South African National Biodiversity Institute, the Conservatoire et Jardin botaniques de la Ville de Genève and Tela Botanica. Retrieved 2009-07-18.
  6. Urbatsch, L. E.; Roberts, R. P.; Karaman, V. (2003). "Phylogenetic evaluation of Xylothamia, Gundlachia, and related genera (Asteraceae, Astereae) based on ETS and ITS nrDNA sequence data". American Journal of Botany. 90 (4): 634–49. doi:10.3732/ajb.90.4.634. PMID 21659159.
  7. "Xylothamia G.L.Nesom, Y.B.Suh, D.R.Morgan & B.B.Simpson | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 25 July 2022.
  8. "Gundlachia A.Gray | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 25 July 2022.
  9. Nesom, Guy L. (10 August 2007). "NOTES ON THE DISARTICULATION OF XYLOTHAMIA (ASTERACEAE: ASTEREAE)". Journal of the Botanical Research Institute of Texas. 1 (1): 145–148.


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