Archived Workshops/References
Santa Cruz Tarplant
Description
The Santa Cruz Sunflower (aka 'Santa Cruz Tarplant,' Holocarpha macradenia) is an endangered plant species which naturally remains only in a few populations in Santa Cruz County. A handful of other small populations have been introduced to the East Bay hills from seed rescued from the last SF Bay population before it was destroyed.
This species is home to moist coastal prairie sites where disturbances maintain a short vegetation canopy through the growing season. Its beautiful flower heads color the otherwise dry fields of mid summer, attracting an interesting array of pollinators.
This website serves as a clearinghouse for information regarding the species. You will find data on population trends and literature on its ecology and management. We encourage you to submit relevent material for posting here. Please email grey@elkhornslough.org with any reports, population numbers, maps, notes, papers, etc., that might help recover this species from endangerment.
Training Programs
| Santa Cruz Tarplant Recovery Workshop | Aug 20, 2003 |
| 2008 Santa Cruz Sunflower Managers' Field Day | Jun 19, 2008 |
| Santa Cruz Sunflower Recovery Workshop | Dec 3, 2015 |
Documents and Publications
| TITLE DATE ADDED |
AUTHOR SOURCE |
DESCRIPTION |
|---|---|---|
| PEER-REVIEWED PUBLICATIONS | ||
| Challenges to Introducing and Managing Disturbance Regimes for Holocarpha macradenia, an Endangered Annual Grassland Forb PDF, 277KB Apr 12 07 |
Karen D. Holl
Grey F. Hayes Conservation Biology 20(4):1121-1131 December 2006 |
This paper describes the difficulties with restoration or experimental introduction of plant species. |
| Seed banks in plant conservation: Case study of Santa Cruz tarplant restoration PDF, 277KB Jan 10 07 |
William H. Satterthwaite
Karen D. Holl,
Grey F. Hayes,
Adelia L. Barber Biological Conservation 135:57-66 February 2007 |
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| OTHER INFORMATION | ||
| Apple Hill Tarplant Numbers PDF, 22KB Jun 30 05 |
California Department of Transportation |
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| City of Santa Cruz Arana Gultch Population Information PDF, 52KB Jun 30 05 |
Lenington, Kirk 2003 |
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| Conservation biology of the Santa Cruz tarplant PDF, 2MB Aug 12 08 |
Dean Wm. Taylor, PhD California Department of Fish and Game March 1990 |
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| Fairway Drive Tarplant Report PDF, 51KB Jun 30 05 |
Vince Cheap California Native Plant Society 2003 |
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| Holocarpha macradenia (Santa Cruz Tarplant) at the Watsonville Airport: Population Trends and Management Actions PDF, 60KB Jun 30 05 |
Kiguchi, Laurie 2003 |
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| Holocarpha macradenia (Santa Cruz tarplant) plant community composition, seedling density, pollination, seed dispersal and plant vigor/phenology. A report submitted to the California Department of Fish and Game. Sacramento, California. PDF, 331KB Jun 30 05 |
Hayes, Grey California Department of Fish and Game 2003 |
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| Holocarpha macradenia Greene (Santa Cruz tarplant) Demography and Management Studies. A report submitted to the California Department of Fish and Game. PDF, 199KB Jun 30 05 |
Bainbridge, Susan California Department of Fish and Game 2003 |
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| Holocarpha macradenia range map TIF, 13.2MB Aug 18 06 |
Eric Van Dyke Elkhorn Slough Coastal Training Program |
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| Holocarpha macradenia response to experimental disturbance regimes. In: Cattle grazing effects on California coastal prairie and associated annual forbs Chapter 4, doctoral dissertation. Department of Environmental Studies, University of California at Sa PDF, 708KB Jun 30 05 |
Hayes, Grey UC Santa Cruz 2002 |
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| It's up to us: The Future of the Santa Cruz Sunflower (tarplant) and Coastal Prairie PDF, 4.1MB Jan 10 07 |
Grey Hayes, PhD Elkhorn Slough Coastal Training Program January 2007 |
This presentation was given to the Santa Cruz Chapter of the California Native Plant Society and taped for airing on Santa Cruz's Community T.V. |
| Management Actions and Population Trends for the Twin Lakes Population of Santa Cruz Tarplant (Holocarpha macradenia), September 1998-July 2003 PDF, 140KB Jun 30 05 |
Hyland, Tim California Department of Parks and Recreation 2003 |
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| Management of Santa Cruz Tarplant at the Santa Cruz Armory PDF, 63KB Jun 30 05 |
Olson, Jody California National Guard 2003 |
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| Map of tarplant populations of Anna Jean Cummings Park from the late 1980s PDF, 226KB Jun 30 05 |
Jon Libby |
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| Population census: Contra Costa populations 1982-2002 PDF, 1.9MB Jun 30 05 |
Contra Costa County |
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| Population census: Santa Cruz and Monterey populations 1977-1994 PDF, 4.7MB Jun 30 05 |
1995 |
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| Proposed bike road through Arana Gulch JPG, 813KB Jun 30 05 |
City of Santa Cruz 2003 |
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| Recent location of Santa Cruz sunflower populations at Arana Gulch JPG, 525KB Jun 30 05 |
Biotic Resources |
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| Report on Holocarpha macradenia at the Elkhorn Slough Foundation's Porter Ranch PDF, 98KB Jun 30 05 |
Hayes, Kimberly Elkhorn Slough Coastal Training Program 2003 |
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| Santa Cruz Tarplant Population at the Graham Hill Road Site PDF, 66KB Jun 30 05 |
Haley, Valerie Native Vegetation Network 2003 |
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| Santa Cruz Tarplant Status and Trends PDF, 2.4MB Jun 30 05 |
California Department of Fish and Game California Department of Fish and Game 2003 |
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| Tarplant Management at Anna Jean Cummings County Park PDF, 95KB Jun 30 05 |
Rigney, Joe Central Coast Wilds 2003 |
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| Tarplant Seedling Identification PDF, 334KB Jun 30 05 |
Elkhorn Slough Coastal Training Program |
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| The Saga of the Santa Cruz Tarplant PDF, 811KB Jan 18 07 |
Grey Hayes Four Seasons, V. 10, #4 December 1998 |
Describes the restoration of the Santa Cruz Sunflower (Holocarpha macradenia) at the Arana Gulch Greenbelt, City of Santa Cruz, California. |
| The US Fish and Wildlife Service Critical Habitat Designation PDF, 37KB Jun 30 05 |
U.S. Fish and Wildlife Service Federal Register, Vol. 67, No. 88, 30642-30643 2002 |
Links
| TITLE | DATE ADDED |
|---|---|
| CalFlora webpage on Santa Cruz Tarplant http://www.calflora.org/cgi-bin/species_query.cgi?special=calflora&where-calrecnum=4205&one=T |
Jun 27 05 |
| Photos of Santa Cruz Tarplant http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-lifeform=Plant--annual%2Fperennial+%2879642%29&rel-taxon=contains&where-taxon=holocarpha+macradenia&rel-namesoup=matchphrase&where-namesoup=&rel-location=matchphrase&where-location=& |
Aug 13 08 |
| More Information on this Species from the California Native Plant Society http://cnps.web.aplus.net/cgi-bin/inv/inventory.cgi/Go?_id=holocarpha_macradenia&sort=DEFAULT&search=holocarpha%20macradenia |
Aug 13 08 |
| US Fish and Wildlife Service website on the species - includes links to federal register notications on threatened status, critical habitat, and restoration projects http://ecos.fws.gov/speciesProfile/SpeciesReport.do?spcode=Q0ZL |
Feb 08 07 |