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Tonestus graniticus, common names granite serpentweed[3] and Lone Mountain serpentweed, is a rare endemic plant species known only from the east side of Lone Mountain in Esmeralda County, Nevada, about 20 km (12.5 miles) west of Tonopah.[4] It grows there in the crevices of granitic outcrops.[5]

Tonestus graniticus
Conservation status

Critically Imperiled  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Tonestus
Species:
T. graniticus
Binomial name
Tonestus graniticus
(Tiehm & L.M. Shultz) G.L. Nesom & D.R. Morgan
Synonyms[2]

Haplopappus graniticus Tiehm & L.M. Shultz

Tonestus graniticus is a perennial herb growing close to the ground and forming mats. Leaves are ovate to spatulate, irregularly toothed, up to 4 cm (1.6 inches) long. Flower heads are born in racemose or corymbiform arrays. There are no ray flowers, but up to 23 yellow disc flowers.[6][7][8]


References


  1. "NatureServe Explorer". NatureServe Explorer Tonestus graniticus. NatureServe. 2022. Retrieved 22 May 2022.
  2. "Tropicos". Tropicos. Retrieved 2014-02-13.
  3. USDA, NRCS (n.d.). "Tonestus graniticus". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 11 December 2015.
  4. "Nevada Natural Heritage Program". Heritage.nv.gov. 2011-12-19. Retrieved 2014-02-13.
  5. "Flora of North America v 20 p 184". Efloras.org. Retrieved 2014-02-13.
  6. "Reinstatement of Tonestus (Asteraceae: Astereae)". Phytologia. 68 (3): 174–180. 2013-05-30. Retrieved 2014-02-13.
  7. Tiehm, Arnold; Shultz, Leila M. (1985-04-01). "A New Haplopappus (Asteraceae: Astereae) from Nevada". Brittonia. 37 (2): 165–168. doi:10.2307/2806095. JSTOR 2806095. S2CID 84391260.
  8. Cronquist, A.J. 1994. Asterales. 5: 1–496. In A.J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermountain Flora. Hafner Publishing Co., New York.


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