Helianthemum greenei - B.L. Robins.
Island Rushrose
Other English Common Names: Island Rush-rose
Other Common Names: island rushrose
Synonym(s): Crocanthemum greenei (B.L. Robins.) Sorrie
Taxonomic Status: Accepted
Related ITIS Name(s): Helianthemum greenei B.L. Robins. (TSN 22265)
Unique Identifier: ELEMENT_GLOBAL.2.130577
Element Code: PDCIS02090
Informal Taxonomy: Plants, Vascular - Flowering Plants - Rock-Rose Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Violales Cistaceae Helianthemum
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Helianthemum greenei
Taxonomic Comments: FNA (vol. 6, 2015) transfers Helianthemum greenei to Crocanthemum greenei; this treatment represents the same concept of the species.
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 18Jun1997
Global Status Last Changed: 13Nov1985
Rounded Global Status: G2 - Imperiled
Reasons: Historically known from 3 of the northern Channel Islands and Santa Catalina Island off the coast of southern California. Now probably extant only on Santa Cruz and Santa Catalina islands. There are 15 recently verified occurrences, most with very small numbers of individuals. Only 4 populations - all in areas areas that burned in 1994 - have more than 500 individuals; most of the others have < 10 individuals. Threats include alteration of the natural fire regime and competition with other shrubs under altered habitat conditions. Habitat for the plant plant on Santa Catalina - where only 3 individuals are known - is being grazed by non-native goats, deer, and bison and is being rooted by feral pigs. And all of the northern Channel Islands have suffered profound loss and degradation of their soils and changes in their plant communities due to the large numbers of non-native mammals introduced to the islands starting in the early 1800's.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S3)

Other Statuses

U.S. Endangered Species Act (USESA): LT: Listed threatened (31Jul1997)
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Overall Threat Impact Comments: Although cattle, pigs, and sheep have now all been removed from the northern Channel Islands, much of the damage to the soil and substrate remains (USFWS 2010). On Santa Catalina Island deer consume H greenei, while both deer and bison trample and disturb the soil (USFWS 2010). On Santa Rosa deer and elk are supposed to be eliminated by 2011, but this species is much more rare here and at greater threat, nonetheless (USFWS 2010). Non-native plants are a continuing threat to H greenei's distribution, recruitment, and thus, survival (USFWS 2010). Other threats include naturally caused events due to the species' restricted range and the small population size (USFWS 2010).

Climate change, especially sea level rise, is real threat since H greenei only exists in the Channel Islands, however at this time the extent of this threat is not yet known (USFWS 2010).

Other NatureServe Conservation Status Information

Distribution
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U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Los Angeles (06037), Santa Barbara (06083)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Santa Barbara Channel Islands (18060014)+, San Pedro Channel Islands (18070107)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A small evergreen shrub, up to 0.5 m tall. Produces yellow flowers March-May.
Terrestrial Habitat(s): Shrubland/chaparral
Habitat Comments: Dry, open, rocky areas, mostly in chaparral vegetation.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 18Jun1997
NatureServe Conservation Status Factors Author: Maybury, K.

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Flora of North America Editorial Committee. 2015. Flora of North America North of Mexico. Vol. 6. Magnoliophyta: Cucurbitaceae to Droserceae. Oxford University Press, New York. 496 pp + xxiv.

  • Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Sorrie, Bruce A. 2011. Transfer of North American Helianthemum to Crocanthemum (Cistaceae): New combinations. Phytologia 93(2): 270-271.

  • U.S. Fish and Wildlife Service (USFWS). 2010. Helianthemum greenei (island rush-rose) 5-Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service, Ventura Fish and Wildlife Office, Ventura, California. Online. Available: (Accessed 2011).

  • U.S. Fish and Wildlife Service (USFWS. 1995. Proposed rule for 16 plant taxa from the northern Channel Islands, California. Federal Register 60(142): 37993-38010.

  • U.S. Fish and Wildlife Service. 1997. Final rule for 13 plant taxa from the northern Channel Islands, California. Federal Register 62(147): 40954-40974.

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