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Arctostaphylos osoensis; photograph (c) Grigory Heaton, some rights reserved (CC BY-SA) CC BY-SA(c) Grigory Heaton, some rights reserved (CC BY-SA) · observed growing wild · 2025-01-20

Arctostaphylos osoensis P.V.Wells

Oso manzanita

Ericaceae · California

No habitat climate
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Arctostaphylos osoensis, photograph (c) paulexcoff, some rights reserved (CC BY-SA)Arctostaphylos osoensis, photograph (c) Mike Heine, some rights reserved (CC BY)Arctostaphylos osoensis, photograph (c) Mike Heine, some rights reserved (CC BY)Arctostaphylos osoensis, photograph (c) Mike Heine, some rights reserved (CC BY)Arctostaphylos osoensis, photograph (c) harrier, some rights reserved (CC BY)Arctostaphylos osoensis, photograph (c) harrier, some rights reserved (CC BY) 151 photographs ›

Summary

Arctostaphylos osoensis is a species of manzanita known by the common name Oso manzanita. It is endemic to San Luis Obispo County, California, where it is known from only two occurrences on the northern edge of the Los Osos Valley. It grows exclusively on volcanic dacite from the Morro Rock-Islay Hill Complex associated with the Nine Sisters.

Quoted from Wikipedia, "Arctostaphylos osoensis", CC BY-SA 4.0.

About the genus · Arctostaphylos

Arctostaphylos is a genus of plants within the family Ericaceae. Many plants within the genus Arctostaphylos are also commonly called manzanitas(/ˌmænzəˈniːtəz/) or bearberries. There are 107 taxa within Arctostaphylos, 106 of which are found in the California Floristic Province. More on Wikipedia ›

Quoted from Wikipedia, "Arctostaphylos", CC BY-SA 4.0.

Cultivation

Nothing derived: no habitat climate for this species.

Climate across the habitat

No habitat climate can be derived: Only 2 distinct land cells of the climate grid hold an in-range record placed to within 10 km; three are needed for an envelope. 71 of the 87 in-range records are placed to worse than 10 km, or to no stated accuracy and fewer than three decimals or by something other than a person's observation, and cannot place a climate cell, though they count for the map and its marker.

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing.
Openly licensed records inside the range, framed on where they fall.
NativeCalifornia · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker35.319, -120.824 · in the densest population, 87 records (100% of those in range)
Kew's description“shrub or tree” · “subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 87 georeferenced records inside the native range; the map shows only the 33 openly licensed ones, which alone would put the marker 7 km away. No climate across the range is derived for this species. 71 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 87 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Arctostaphylos osoensis, photograph 1did not loadArctostaphylos osoensis, photograph 2did not loadArctostaphylos osoensis, photograph 3did not loadArctostaphylos osoensis, photograph 4did not loadArctostaphylos osoensis, photograph 5did not loadArctostaphylos osoensis, photograph 6did not load

Photographs: (c) paulexcoff, some rights reserved (CC BY-SA); (c) Mike Heine, some rights reserved (CC BY) (3); (c) harrier, some rights reserved (CC BY) (2).

Other Arctostaphylos 50 in the reference

Arctostaphylos andersonii Arctostaphylos andersonii Santa Cruz manzanita Photo: CC BY, Isaac KroneArctostaphylos auriculata Arctostaphylos auriculata Mount Diablo manzanita Photo: CC BY, er-birds Arctostaphylos australis Australian manzanita Arctostaphylos bakeri Arctostaphylos bakeri Baker's manzanita Photo: CC BY, Alexander WentworthArctostaphylos canescens Arctostaphylos canescens Hoary manzanita Photo: CC0, author not statedArctostaphylos catalinae Arctostaphylos catalinae Santa Catalina Island manzanita Photo: CC BY, Aaron KreisbergArctostaphylos × coloradensis Arctostaphylos × coloradensis Colorado manzanita Photo: CC BY, Anders HastingsArctostaphylos columbiana Arctostaphylos columbiana Columbia manzanita Photo: CC0, author not statedArctostaphylos crustacea Arctostaphylos crustacea Brittleleaf manzanita Photo: CC BY, harriiArctostaphylos cruzensis Arctostaphylos cruzensis Arroyo de la Cruz manzanita Photo: CC0, author not statedArctostaphylos densiflora Arctostaphylos densiflora Vine Hill manzanita Photo: CC BY, Madeleine ClaireArctostaphylos edmundsii Arctostaphylos edmundsii Little Sur manzanita Photo: CC BY-SA, Nicholas Wei all 51 ›

Names & registers

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Ericaceae
Described by
P.V.Wells
Native to
California
Wild records
87 in range · 33 open

Every figure here is derived from public data by a stated rule and names its source; nothing about this species is written for its page by a person or by AI, apart from the marked, credited quotations. How →

Where this page came from built 2026-10-21
GBIF species record gbif.species answeredasked 2026-10-21
GBIF synonyms gbif.synonyms answeredasked 2026-10-21
GBIF common names gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 2 records within 1 km of a botanic garden, herbarium or zoo left out (2 at a botanic garden or arboretum; Wikidata's list)
Habitat climate climate nothing to reportasked 2026-10-21only 2 distinct land cells of the climate grid hold an in-range record placed to within 10 km; three are needed for an envelope
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist photographs, wild inat.photos.wild answeredasked 2026-10-22from iNaturalist's open data of 2026-09-27: research-grade observations with an open-licence photograph, the 24 whose photographs iNaturalist received last (the open data holds no votes); filled 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-21
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every source is recorded as having answered, reported nothing, refused, failed, not been asked, or answered twice where one answer is taken (“not taken: two items answered”), and, for a source asked when this page was built, when: the figures are as the source held them that day; a source read from a file (Kew's World Checklist, a GBIF download) says "as of" the file's day instead; a row carried from an earlier build of the page names that build instead. Only “nothing to report” is ever shown as an absence. Records came from 11 datasets via GBIF.org; each carries its own licence.

Cultifolio

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