Taxon Report

Dimeresia howellii Gray

doublet

Print Report

©2016 Richard Spellenberg

Classification


Scientific Name:	Dimeresia howellii Gray
Common Name:	doublet
Family:	Asteraceae
Element Code:	PDAST2Z010
USDA Plants Symbol:	DIHO2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Sep	May-Sep
Elevation:	1340-2380 (4395-7810)
General Habitats:	Lower montane coniferous forest, Pinyon and juniper woodland
Microhabitat:	Volcanic
Microhabitat Details:	xeric

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G4
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.3 to 2B.3 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	50
Element Occurrence Ranks:
Excellent (A)	9
Good (B)	18
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	22

Location


California Endemic: False
California Counties and Islands: Name (Code)
Lassen (LAS), Modoc (MOD), Siskiyou (SIS)
Quads: Name (Quad Code)
Alturas (4112045), Ash Valley (4112016), Bonita Butte (4112166), Caldwell Butte (4112164), Cedarville (4112052), Eagle Peak (4112032), Emerson Peak (4112022), Infernal Caverns (4112035), Lake Annie (4112081), Lake City (4112062), Lane Reservoir (4112017), Larkspur Hills (4112071), Letterbox Hill (4112018), Mahogany Ridge (4112055), Mt. Bidwell (4112082), Payne Peak (4112053), Rattlesnake Butte (4112046), Sheepshead (4012077), Warren Peak (4112042), Willow Ranch (4112083)

Threat List Data from the CNDDB


Threat List Total:	7
EOs with Threat Listed:	Total EOs	% of EOs
	18	36 %
Other	9	18%
Grazing	7	14%
Road/trail construction/maint.	2	4%
Wood cutting or brush clearing	1	2%
Mining	1	2%
ORV activity	1	2%
Foot traffic/trampling	1	2%

Notes



Possibly threatened by foot traffic and grazing. Threatened in ID. See Synoptical Flora of North America ed. 2, 1(2):449 (1886) for original description, and Fremontia 16(1):15-17 (1988) for brief species account and BLM management plans.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].