Taxon Report

Arctostaphylos mewukka Merriam ssp. truei (Knight) Wells

True's manzanita

Print Report

Taxon Summary

Arctostaphylos mewukka ssp. truei, commonly known as True's manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral, and Lower montane coniferous forest, growing at elevations from 425 to 1390 meters. Arctostaphylos mewukka ssp. truei is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Arctostaphylos mewukka Merriam ssp. truei (Knight) Wells
Common Name:	True's manzanita
Family:	Ericaceae
Element Code:	PDERI040Q2
USDA Plants Symbol:	ARMET
Synonyms/Other Names:	Arctostaphylos truei Knight

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Feb-Jul	Feb-Jul
Elevation:	425-1390 (1395-4560)
General Habitats:	Chaparral, Lower montane coniferous forest
Microhabitat:	Roadsides (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4?T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	SB_UCSC
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: True
California Counties and Islands: Name (Code)
Butte (BUT), El Dorado (ELD), Nevada (NEV), Placer (PLA), Plumas (PLU), Yuba (YUB)
Quads: Name (Quad Code)
Berry Creek (3912164), Butte Meadows (4012115), Caribou (4012112), Cascade (3912162), Clipper Mills (3912152), Crescent Mills (4012018), Forbestown (3912153), Garden Valley (3812077), Grass Valley (3912121), Greek Store (3912015), Michigan Bluff (3912016), North Bloomfield (3912038), Paradise East (3912175), Pulga (3912174), Quincy (3912088), Soapstone Hill (3912173), Stirling City (3912185), Storrie (3912183), Twain (4012111), Westville (3912026)

Threat List Data from the CNDDB


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

Notes



Threatened by logging and associated road usage. Intergrades with ssp. mewukka in NEV and PLA counties. See Four Seasons 3(1):19 (1969) for original description, and Four Seasons 9(2):60-63 (1992) for revised nomenclature.
Threats:

Taxonomy:

Selected References

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 June 2025].