Psathyrotes

Psathyrotes is a genus of North American plants in the sneezeweed tribe within the sunflower family.[3] It contains annual and perennial forbs and low subshrubs native to dry areas of southwestern North America. Common names include turtleback, brittlestem, and fanleaf.

"Turtleback" redirects here. For other uses, see Turtleback (disambiguation).

Psathyrotes
Psathyrotes ramosissima
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Helenieae
Subtribe: Psathyrotinae
Genus: Psathyrotes
A.Gray
Type species
Psathyrotes annua
Synonyms[2]
  • Bulbostylis sect. Psathyrotus Nutt.
  • Pseudobartlettia Rydb.

The plants are low, densely branching, hairy, and scaly, with a turpentine-like odor. Leaves are alternate and hairy. The Latin name of the genus (from the Greek psathurotes) refers to the brittleness of the stems.

Species[2][4]
  • Psathyrotes annua (Nutt.) Gray (annual psathyrotes, mealy rosettes, turtleback) - CA NV UT AZ ID
    • Synonyms: Bulbostylis annua Nutt.
    • Annual or perennial forb
  • Psathyrotes pilifera Gray (hairy-beast turtleback, hairybeast brittlestem) - NV UT AZ
    • Annual forb
  • Psathyrotes ramosissima (Torr.) Gray (velvet rosette, velvet turtleback, turtleback) - NV UT AZ CA, Baja California, Sonora
    • Synonyms: Tetradymia ramosissima Torr.
    • Annual or perennial forb or subshrub
formerly included[2]

see Peucephyllum Psathyrotopsis Trichoptilium

  • Psathyrotes incisa A.Gray - Trichoptilium incisum (A.Gray) A.Gray
  • Psathyrotes purpusii Brandegee - Psathyrotopsis purpusii (Brandegee) Rydb.
  • Psathyrotes scaposa A.Gray - Psathyrotopsis scaposa (A.Gray) H.Rob.
  • Psathyrotes schottii (A.Gray) A.Gray - Peucephyllum schottii A.Gray

References
  1. Tropicos, Psathyrotes (Nutt.) A. Gray
  2. Flann, C (ed) 2009+ Global Compositae Checklist Archived 2015-01-02 at archive.today
  3. Gray, Asa. 1853. Smithsonian Contributions to Knowledge 5(6): 100
  4. Biota of North America Program 2013 county distribution maps

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