Roadless Areas
Home/Species/ Santa Margarita Manzanita

Arctostaphylos pilosula

Jepson & Wies. ex Jepson

Santa Margarita Manzanita

G2Imperiled (G2?) Found in 2 roadless areas NatureServe Explorer →
G2ImperiledGlobal Rank
High - mediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.895812
Element CodePDERI042Z0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderEricales
FamilyEricaceae
GenusArctostaphylos
Concept Reference
Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, eds. 2012. The Jepson manual: vascular plants of California. 2nd edition. University of California Press, Berkeley, CA. 1568 pp.
Taxonomic Comments
The 2nd edition of The Jepson Manual (Baldwin et al. 2012) and the Flora of North America (2009) treatment of Arctostaphylos pilosula includes plants previously treated as the distinct species, A. wellsii by Kartesz (1994, 1999).
Conservation Status
Rank MethodLegacy Rank calculation - Excel v3.1x
Review Date2016-03-28
Change Date2016-03-28
Edition Date2016-03-28
Edition AuthorsBittman and Treher (2016)
Threat ImpactHigh - medium
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Endemic of San Luis Obispo County, California. Most occurrences are historic (need to be surveyed) but in total there are about 50. Numerous threats but up to date survey information will provide a better assessment of the scope and severity of those threats.
Range Extent Comments
Endemic to San Luis Obispo County, California.
Occurrences Comments
Fifty occurrences but about 30 are historical and need to be surveyed to confirm the plants are extant.
Threat Impact Comments
Threats include development, ORVs, brush clearing, mining, grazing, fire, and road maintenance.
Ecology & Habitat

Habitat

Occurs in chaparral and open forests.
Terrestrial Habitats
Woodland - MixedShrubland/chaparral
Other Nations (1)
United StatesN2
ProvinceRankNative
CaliforniaS2Yes
Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (2)
California (2)
AreaForestAcres
La PanzaLos Padres National Forest4,954
Machesna MountainLos Padres National Forest12,271
References (2)
  1. Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, eds. 2012. The Jepson manual: vascular plants of California. 2nd edition. University of California Press, Berkeley, CA. 1568 pp.
  2. Flora of North America Editorial Committee (FNA). 2009. Flora of North America north of Mexico. Vol. 8. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford University Press, New York. xxiv + 585 pp.