Hymenoxys grandiflora

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Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Hymenoxys
Species:
H. grandiflora
Binomial name
Hymenoxys grandiflora
(Torr. ex A.Gray) K.F.Parker 1950
Synonyms[1]
Synonymy
  • Actinea grandiflora (Torr. & A.Gray ex Torr. & A.Gray) Kuntze
  • Actinella grandiflora Torr. & A.Gray 1845
  • Cephalophora grandiflora (Torr. & A.Gray) Walp.
  • Ptilepida grandiflora (Torr. & A.Gray) Rose
  • Rydbergia grandiflora (Torr. & A.Gray ex Torr. & A.Gray) Greene
  • Tetraneuris grandiflora (Torr. & A.Gray ex Torr. & A.Gray) K.F.Parker

Hymenoxys grandiflora is a North American species of flowering plant in the daisy family known by the common names graylocks four-nerve daisy,[2] graylocks rubberweed, or old man of the mountain.[3] It is native to high elevations in the Rocky Mountains of the western United States.

Description

H. grandiflora is a perennial herb up to 30 centimeters (1 foot) tall. The leaves are 7.5–10 cm (3–4 in) long.[4] The plant generally produces one flower head per stem, up to 10 per plant, present between June and August.[4] Each head has 15–44 ray flowers and 150–400 disc flowers.[5] The seeds are five-sided with narrow scales at the tip.[4]

The species has the largest flowers of any in its genus, hence the specific epithet grandiflora (large-flowered).[4]

Cannibal Plateau, Powderhorn Wilderness, Hinsdale County, Colorado

Distribution and habitat

The plant is native to high elevations in the Rocky Mountains of the western United States, in the states of Montana, Idaho, Wyoming, Utah, Colorado, and New Mexico.[6][7] It can be found on rocky slopes, meadows, and tundra environments.[4]

References

  1. ↑ The Plant List, Hymenoxys grandiflora (Torr. & A.Gray ex Torr. & A.Gray) K.F.Parker
  2. ↑ USDA, NRCS (n.d.). "Tetraneuris grandiflora". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 9 December 2015.
  3. ↑ "Old man of the mountain - Hymenoxys grandiflora". Colorado Plant Database. Colorado State University Extension, Jefferson County. Retrieved 25 March 2020.
  4. 1 2 3 4 5 Spellenberg, Richard (2001) [1979]. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.). Knopf. pp. 381–382. ISBN 978-0-375-40233-3.
  5. ↑ Flora of North America, Hymenoxys grandiflora (Torrey & A. Gray) K. F. Parker, 1950. Graylocks rubberweed, four-nerved daisy
  6. ↑ Biota of North America Program 2014 distribution map
  7. ↑ SEINet, Southwestern Biodiversity, Arizona chapter description, photos, distribution map


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