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RARE AND ENDANGERED PLANTS
 

ENDANGERED PLANTS ON CATALINA

Catalina Island is home to many threatened, endangered, or listed plant species. Some of these species are only listed at the state level, meaning they are only threatened/endangered/rare in California. Others are listed at the federal level. Species are also listed by the California Native Plant Society.

For more information on the federal plant rankings, visit the U.S. Fish and Wildlife webpage.

For more information on the state plant rankings, visit the California Department of Fish and Wildlife webpage.

For more information on the CNPS plant rankings, visit the California Native Plant Society webpage.

Below is a list of our listed plant species. Their rankings follow.

Species Name Federal State CNPS
Abronia maritima
- - 4.2
Acmispon dendroideus var. dendroideus - - 4.2
Aphanisma blitoides - - 1B.2
Arctostaphylos catalinae (endemic) - - 1B.2
Atriplex coulteri - - 1B.2
Atriplex pacifica - - 1B.2
Atriplex serenana var. davidsonii - - 1B.2
Bergerocactus emoryi - - 2B.2
California macrophylla - - 1B.1
Calochortus catalinae - - 4.2
Ceanothus megacarpus var. insularis - - 4.3
Centromadia parryi ssp. australis - - 1B.1
Cercocarpus betuloides var. blancheae - - 4.3
Cercocarpus traskiae (endemic) Endangered Endangered 1B.1
Cistanthe maritima - - 4.2
Constancea nevinii - - 1B.3
Convolvulus simulans - - 4.2
Crossosoma californicum - - 1B.2
Cryptantha wigginsii - - 1B.2
Deinandra clementina - - 4.3
Dendromecon harfordii - - 3.1
Dichondra occidentalis - - 4.2
Dissanthelium californicum - - 1B.2
Dithyrea maritima - Threatened 1B.1
Dudleya greenei - - 4.2
Dudleya virens ssp. hassei (endemic) - - 1B.2
Dudleya virens ssp. insularis - - 1B.2
Eriogonum giganteum var. giganteum (endemic) - - 4.3
Eriogonum grande var. grande - - 4.2
Eschscholzia ramosa - - 4.3
Euphorbia misera - - 2B.2
Galium catalinense ssp. catalinense (endemic) - - 1B.2
Galium nuttallii ssp. insulare - - 4.3
Gambelia speciosa - - 1B.2
Gila nevinii - - 4.3
Harpagonella palmeria - - 4.2
Helianthemum greenei Threatened - 1B.2
Hesperocyparis macrocarpa - - 1B.2
Hesperocyparis stephensonii - - 1B.1
Hordeum intercedens - - 3.2
Isocoma menziesii var. decumbens - - 1B.2
Jepsonia malvifolia - - 4.2
Juglans californica - - 4.2
Juncus acutus ssp. leopoldii - - 4.2
Lepechinia fragrans - - 4.2
Lepidium virginicum ssp. menziesii - - 4.3
Lonicera subspicata var. subspicata - - 1B.2
Lycium brevipes var. hasseii - - 1B.1
Lycium californicum - - 4.2
Lyonothamnus floribundus ssp. floribundus (endemic) - - 1B.2
Malva assurgentiflora - - 1B.1
Microseris douglasii ssp. platycarpha - - 4.2
Mimulus traskiae - - 1A
Nemacaulis denudata var. denudata - - 1B.2
Ophioglossum californicum - - 4.2
Orobanche parishii ssp. brachyloba - - 4.2
Pentachaeta lyonii Endangered Endangered 1B.1
Pinus radiata - - 1B.1
Pinus torreyana ssp. insularis - - 1B.2
Piperia cooperi - - 4.2
Quercus engelmannii - - 4.2
Quercus pacifica - - 4.2
Quercus tomentella - - 4.2
Rhamnus pirifolia - - 4.2
Ribes viburnifolium - - 1B.2
Romneya coulteri - - 4.2
Scrophularia villosa - - 1B.2
Senecio aphanactis - - 2B.2
Sibara filifolia Endangered - 1B.1
Solanum wallacei - - 1B.1
Suaeda taxifolia - - 4.2
Trifolium palmeri - - 4.2













Malva assurgentiflora, a listed plant species on Catalina Island. Photo by A. Aarhus.
























Lepechinia fragrans, a listed plant species on Catalina Island. Photo by T. Dvorak.

CATALINA’S RARE PLANTS

Over 160 plants on Catalina Island are considered rare. The term “rare” is defined as any species that has 3 or less populations on the island. Not all of the rare plants on Catalina are rare on the mainland. Our unique habitats as well as the populations of introduced deer and bison create a very different environment than on the mainland and even other Channel Islands. This can cause species that are common on the mainland to be rare on Catalina.
Some of the noteworthy rare species are listed below:

  • Aphanisma (Aphanisma blitoides)
  • California dissanthelium (Dissanthelium californicum)
  • California groundsel (Senecio aphanactis)
  • Catalina Island monkeyflower (Mimulus traskiae)
  • Catalina Island mountain-mahogany (Cercocarpus traskiae)
  • Cliff spurge (Euphorbia misera)
  • Decumbent goldenbush (Isocoma menziesii var. decumbens)
  • Dunn’s lobelia (Lobelia dunnii var. serrata)
  • Engelmann oak (Quercus engelmannii)
  • Greene’s dudleya (Dudleya greenei)
  • Lyon’s pentachaeta (Pentachaeta lyonii)
  • Malva rosa (Malva assurgentiflora)
  • Red sand verbena (Abronia maritima)
  • Santa Barbara honeysuckle (Lonicera subspicata var. subspicata)
  • Seaside calandrinia (Cistanthe maritima)
  • Small-flowered morning-glory (Convolvulus simulans)
  • Thread-leaf rock cress (Sibara filifolia)
  • Woolly sea-blite (Suaeda taxifolia)












Lobelia dunnii var. serrata, a rare plant species on Catalina Island. Photo by S. Ratay.
 

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