Arctostaphylos montereyensis
status box

threatened

Photo taken at Fort Ord © 2001 by Bruce Delgado

Photo taken at Fort Ord © 2001 by Bruce Delgado

Photo taken at Fort Ord © 2007 by Dylan Neubauer

Photo taken at Fort Ord © 2007 by Dylan Neubauer

Photo taken at Fort Ord © 2007 by Dylan Neubauer

Photo taken at Fort Ord © 2007 by Dylan Neubauer

A red polygon indicates occurrence is extant; yellow indicates the occurrence	 has been extirpated

A red polygon indicates occurrence is extant; yellow indicates the occurrence has been extirpated


This fact sheet was prepared by Grey F. Hayes and Dean W. Taylor under award NA04N0S4200074 from the National Oceanic and Atmospheric Administration (NOAA), U.S. Department of Commerce (DOC). The statements, findings, conclusions, and recommendations are those of the authors and do not necessarily reflect the views of the NOAA or the DOC.

© Copyright 2006, Elkhorn Slough Coastal Training Program

Last updated: Sep 7, 2007 12:16

Common Names - Monterey manzanita

Family - Ericaceae (Heath Family)

State Status - none

Federal Status - none

Habitat

Sandy, inland, late-Pleistocene sand deposits (Arnold series) overtopping leached Aromas Sands Formation parent material on mesas and hillsides of maritime chaparral and along edges of coast live oak (Quercus agrifolia var. agrifolia) woodland, < 350 m.
 

Key Characteristics

Erect, shrubs to 3 m tall, basal burl absent; twigs, leaves, nascent inflorescence axis, bract, pedicel, ovary, fruit glandular-hairy; leaves erect, not overlapped, petiole 4–6 mm long, blade 2–3 cm long, 1.5–3 cm wide, blade surfaces similar, dark green to very slightly glaucous, finely papillate, scabrous, dull, glandular-hairy; inflorescence paniculate, 4–10-branched, bracts 3–12 mm, leaf-like, green, persistent; berries 8–12 mm wide, sticky (Parker et al. 2013).

Flowering Period

February to March (identification possible throughout the year).

Reference Populations

Ft. Ord National Monument, Toro Park (Monterey County).

Global Distribution

Endemic to the Monterey Bay region of California.

Conservation

The most immediate conservation threats are erosion and fire suppression. The latter interferes with the Monterey manzanita's ability to reproduce, due the fact that the it, like other obligate seeders, requires periodic fires for germination. In contrast, burl-forming manzanitas can resprout after fire. Mowing had reduced regeneration of the manzanita at Parker Flats on Ft. Ord—hence the reason for burning the area in 2005. Another threat is competition from invasive species.

The reported location for San Luis Obispo County requires field study. Parker et al. (2013) did not include San Luis Obispo within the known range. Occurrences in and around the Monterey airport were eliminated in the 1980s; the remaining large stable occurrences are on Ft. Ord where the species occupies thousands of acres. A report from upper Carmel Valley has not been located in recent years.

References

CNPS, Rare Plant Program. 2015. Arctostaphylos montereyensis, in Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. http://www.rareplants.cnps.org/detail/104.html [accessed 1 February 2015].

Griffin, J. R. 1978. Maritime chaparral and endemic shrubs of the Monterey Bay region, California. Madroño 25:65–112.

Parker, V. T., M. C. Vasey, and J. E. Keeley. 2013. Arctostaphylos, in Jepson Flora Project (eds.). Jepson eFlorahttp://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=13950 [accessed 1 February 2015].

Van Dyke, E. and K. Holl. 2003. Mapping the Distribution of Maritime Chaparral Species in the Monterey Bay Area. Prepared for the U.S. Fish and Wildlife Service.

Reviewed by Bruce Delgado and Lars Pierce (August 2007).
 

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