CNPS

CNPS Rare Plant Inventory



Taxon Details

Arctostaphylos mewukka ssp. truei

True's manzanita

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Photo of Arctostaphylos mewukka ssp. truei
© 2008 George W. Hartwell 		Photo of Arctostaphylos mewukka ssp. truei
© 2008 George W. Hartwell 		Photo of Arctostaphylos mewukka ssp. truei
© 2008 George W. Hartwell

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:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 4.2
Fed List: None
State List: None
Global Rank: G4?T3
State Rank:
 S3
Other Status: SB_UCSC
CRPR Changes:
Add Date: 1984-01-01
Date Edited: 2022-12-06

  Ecology and Life History

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

  Notes

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:

  Threat List Data from the CNDDB

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

  Occurrence Data from the CNDDB

Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
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)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

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Suggested 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].
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