Taxon Summary

Sedum laxum ssp. heckneri, commonly known as Heckner's stonecrop, is a perennial herb in the Crassulaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 100 to 2100 meters. Sedum laxum ssp. heckneri is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Sedum laxum (Britt.) Berger ssp. heckneri (Peck) Clausen
Common Name:	Heckner's stonecrop
Family:	Crassulaceae
Element Code:	PDCRA0A0L3
USDA Plants Symbol:	SELAH
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Jul	Jun-Jul
Elevation:	100-2100 (330-6890)
General Habitats:	Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat:	Gabbroic (sometimes), Serpentine (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G5?T4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Bark Shanty Gulch (4112345), Bear Peak (4112365), Black Lassic (4012335), Board Camp Mtn. (4012366), Broken Rib Mtn. (4112386), Chimney Rock (4112356), Clear Creek (4112364), Denny (4012384), Devils Punchbowl (4112376), Dillon Mtn. (4112355), Dutch Creek (4112381), English Peak (4112342), Figurehead Mtn. (4112383), Fish Lake (4112336), Forks of Salmon (4112333), Grouse Mtn. (4012376), Happy Camp (4112374), High Plateau Mtn. (4112388), Hoopa (4112316), Hopkins Butte (4112325), Ironside Mtn. (4012374), Johnsons (4112337), Kangaroo Mtn. (4112382), Lonesome Ridge (4112346), Lord-ellis Summit (4012387), Mount Eddy (4112234), Naufus Creek (4012343), Orleans (4112335), Orleans Mtn. (4112334), Preston Peak (4112375), Ruth Reservoir (4012334), Salmon Mtn. (4112324), Salyer (4012385), Seiad Valley (4112372), Shelly Creek Ridge (4112387), Ship Mountain (4112367), Slater Butte (4112373), Somes Bar (4112344), South China Mtn. (4112235), Summit Valley (4112357), Trinity Mtn. (4112314), Ukonom Mtn. (4112354), Weitchpec (4112326), Willow Creek (4012386)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Subspecies are somewhat indistinct. Endangered in OR. See Proceedings of the Biological Society of Washington 50:121 (1937) for original description, and Sedum of North America North of the Mexican Plateau, p. 391-393 (1975) by R.T. Clausen for taxonomic treatment.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].

Taxon Report

Sedum laxum (Britt.) Berger ssp. heckneri (Peck) Clausen

Heckner's stonecrop