Taxon Report

Sedum marmorense Otting & R. E. Brainerd

Marble Mountains stonecrop

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Taxon Summary

Sedum marmorense, commonly known as Marble Mountains stonecrop, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Subalpine coniferous forest, and Upper montane coniferous forest, growing at elevations from 1875 to 2345 meters. Sedum marmorense is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Sedum marmorense Otting & R. E. Brainerd
Common Name:	Marble Mountains stonecrop
Family:	Crassulaceae
Element Code:	PDCRA0A230
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	1875-2345 (6150-7695)
General Habitats:	Subalpine coniferous forest, Upper montane coniferous forest
Microhabitat:	Openings, Rock crevices, Rocky, Talus
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G1G2
State Rank:	S1S2
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 1B.2 on 2021-05-14

Occurrence Data from the CNDDB


Total Occurrences:	6
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	4

Location


California Endemic: False
California Counties and Islands: Name (Code)
Siskiyou (SIS)
Quads: Name (Quad Code)
Boulder Peak (4112351), Grider Valley (4112362), Marble Mountain (4112352), Scott Bar (4112361), Seiad Valley (4112372)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	2	33 %
Improper burning regime	2	33%
Over-collecting/poaching	1	16%

Notes



Possibly threatened by horticultural collecting. Previously identified as S. obtusatum ssp. boreale, in part. Similar to S. oregonense; differs in having dense rosettes and waxy granules on calyxes and inflorescence branches vs. looser rosettes and lacking waxy granules in S. oregonense. See Phytotaxa 368: 1–61 (2018) for original description.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2021-05-14

Sedum marmorense account for potential Species of Conservation Concern evaluation (2021)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 November 2025].