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.

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
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

Description

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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

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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

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  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. ^ a b c d e 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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