Rhodiola integrifolia

Rhodiola integrifolia
Conservation status
	; Secure (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Saxifragales
Family:	Crassulaceae
Genus:	Rhodiola
Species:	R. integrifolia
Binomial name
	Rhodiola integrifolia; Raf.
Subspecies
	Rhodiola integrifolia subsp. integrifolia ; Rhodiola integrifolia subsp. leedyi (Rosend. & J.W.Moore) H.Ohba ; Rhodiola integrifolia subsp. neomexicana (Britton) Kartesz ;
Synonyms
	List Rhodiola rosea subsp. integrifolia (Raf.) Kozhevn. (1981) ; Rhodiola rosea var. integrifolia (Raf.) Jeps. (1925) ; Rhodiola rosea subsp. integrifolia (Raf.) H.Hara (1952) ; Sedum integrifolium (Raf.) A.Nelson (1909) ; Sedum rosea subsp. integrifolium (Raf.) Hultén (1945) ; Sedum rosea var. integrifolium (Raf.) A.Berger (1930) ; Tolmachevia integrifolia (Raf.) Á.Löve & D.Löve (1975) ; ;

Rhodiola integrifolia is a species of flowering plant in the stonecrop family known by the common names ledge stonecrop,^[3] western roseroot, and king's crown. It is native to north-easternmost Russia, including Kamchatka, and western North America, where it grows in mountainous habitat in subalpine and alpine climates, including meadows, cliffs, and talus. It is a perennial herb producing a stout stem from a fleshy, branching caudex, reaching a maximum height near 30 centimeters. The fleshy leaves are alternately arranged on the stem, widely lance-shaped to oval and pointed, flat but upcurved toward the tip, reaching 2.5 centimeters long. They are green when new and age to orange, rose, or red. The inflorescence is a dense cyme of up to 50 flowers with fleshy petals in shades of bright red to deep purple. The fruits are red, rounded ovals with pointed tips.^[4]

There are several subspecies of this plant, with one, ssp. leedyi, very rare and limited to a few populations in Minnesota and upstate New York.^[5] This subspecies is considered a relict from times when its range was covered in glaciers; it survives on barren cliffs which are kept cold by air blowing through cracks from caves.^[5] It is treated as a federally listed threatened species in the United States. In 2024, a team at Cornell University successfully established a population of the plants in a nearby canyon, helping to prevent the plant from becoming extinct.^[6]

References

^ NatureServe (2024). "Rhodiola integrifolia". Arlington, Virginia. Retrieved 6 March 2024.
^ "Rhodiola integrifolia Raf". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 6 March 2024.
^ NRCS. "Rhodiola integrifolia". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 21 October 2015.
^ Elizabeth Wenk (2015). Wildflowers of the High Sierra and John Muir Trail. Wilderness Press. ISBN 978-0-89997-738-6.
^ ^a ^b Center for Plant Conservation Archived 29 October 2010 at the Wayback Machine
^ Hooper, Anna (13 January 2024). "Cascadilla Gorge offers a safe haven for rare species". Cornell Chronicle. Retrieved 1 February 2024.

External links

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[NatureServe-1] NatureServe (2024). "Rhodiola integrifolia". Arlington, Virginia. Retrieved 6 March 2024.

[POWO-2] "Rhodiola integrifolia Raf". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 6 March 2024.

[3] NRCS. "Rhodiola integrifolia". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 21 October 2015.

[Wenk-4] Elizabeth Wenk (2015). Wildflowers of the High Sierra and John Muir Trail. Wilderness Press. ISBN 978-0-89997-738-6.

[cpc-5] Center for Plant Conservation Archived 29 October 2010 at the Wayback Machine

[6] Hooper, Anna (13 January 2024). "Cascadilla Gorge offers a safe haven for rare species". Cornell Chronicle. Retrieved 1 February 2024.

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