Taxon Report

Chaenactis suffrutescens Gray

Shasta chaenactis

Print Report


© 2015 Steve Matson

Taxon Summary

Chaenactis suffrutescens, commonly known as Shasta chaenactis, is a perennial herb in the Asteraceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 750 to 2800 meters. Chaenactis suffrutescens is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

  Classification
Scientific Name:
 Chaenactis suffrutescens Gray
Common Name:
 Shasta chaenactis
Family: Asteraceae
Element Code: PDAST200H0
USDA Plants Symbol: CHSU
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: May-Sep May-Sep
Elevation: 750-2800 (2460-9185)
General Habitats: Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat: Sandy, Serpentine
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.3
Global Rank: G2G3
State Rank:
 S2S3
State List: None
Fed List: None
Other Status: BLM_S; SB_BerrySB; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 38
Element Occurrence Ranks:
   Excellent (A) 4
   Good (B) 7
   Fair (C) 2
   Poor (D) 2
   None (X) 1
   Unknown (U) 22

Location
California Endemic:  False
California Counties and Islands: Name (Code)
Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Caribou Lake (4112218), Carrville (4112216), Cecil Lake (4112312), Cecilville (4112322), China Mtn. (4112245), City of Mount Shasta (4112233), Dees Peak (4112313), Dunsmuir (4112223), Duzel Rock (4112256), Etna (4112248), Fort Jones (4112257), Grasshopper Ridge (4112321), Greenview (4112258), Hayfork Summit (4012351), Mount Eddy (4112234), Seven Lakes Basin (4112224), Smoky Creek (4012332), Solomons Temple (4112263), South China Mtn. (4112235), Tangle Blue Lake (4112226), Thurston Peaks (4012382), Trinity Center (4012286), Weed (4112244)

Threat List Data from the CNDDB

Threat List Total: 10
EOs with Threat Listed: Total EOs % of EOs
12 32 %
Road/trail construction/maint. 6 15%
Dam/Inundation 3 7%
Recreational use (non-ORV) 2 5%
Altered flood/tidal/hydrologic regime 1 2%
Development 1 2%
Erosion/runoff 1 2%
Grazing 1 2%
Non-native plant impacts 1 2%
ORV activity 1 2%
Other 1 2%

Notes
Rare on the Shasta-Trinity NF.
Threats:
Threatened by erosion, grazing, and vehicles. Possibly threatened by development and non-native plants.
Taxonomy:

Selected References

Account for potential SCC 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 27 January 2025].