Rare Plants of the Liebre Mountains, Los Angeles County

Based on the research and flora published by Steve Boyd of the Liebre Mountains, David Magney compiled a preliminary list of rare plants of the Liebre Mountains region in northwestern Los Angeles County (Boyd, S. 1999. Vascular Flora of the Liebre Mountains, Western Transverse Ranges, California. (Occasional Publications, No. 5.) Rancho Santa Ana Botanic Garden, Claremont, California, reprinted from Aliso 18(2):93:139, 1999). Similar rules used for the Ventura County rare plants list were applied to the Liebre Mountains flora. This checklist should be considered preliminary and is currently under critical review by Mr. Boyd at the Rancho Santa Ana Botanic Garden Herbarium.

A total of 282 vascular plant taxa are currently on this list, including some unusual hybrids. Two categories are used: rare and uncommon, following the same criteria used for the Ventura County checklist of rare plants (“rare” for taxa with 5 or fewer populations or otherwise listed, “uncommon” for taxa with 6-10 populations). Some of the “rare” species are also otherwise listed by the USFWS, CDFG, and/or CNPS.

Map of Liebre Mountains Region

Map clipped from TOPO!

Preliminary Checklist of Liebre Mountain Region Locally Rare Plants

Scientific Name	Rarity
Acanthomintha obovata	Rare
Achyrachaena mollis	Rare
Adiantum capillus-veneris	Uncommon
Allium burlewii	Rare (only 1 herbarium record)
Allium campanulatum	Rare
Allium haematochiton	Rare
Allium lacunosum var. davisiae	Rare
Allium lacunosum var. lacunosum	Uncommon
Allium praecox	Rare
Allophyllum divaricatum	Rare
Allophyllum gilioides ssp. gilioides	Rare
Allophyllum gilioides ssp. violaceum	Uncommon
Allophyllum glutinosum	Rare
Amelanchier utahensis	Uncommon
Apocynum cannabinum	Rare
Arabis glabra var. glabra	Uncommon
Arabis pulchra var. gracilis	Rare
Arabis sparsiflora var. arcuata	Uncommon
Arabis sparsiflora var. californica	Rare
Arctostaphylos parryana	Rare
Argemone corymbosa	Uncommon
Aristida adscensionis	Rare
Aristida purpurea var. parishii	Rare
Asclepias erosa	Rare
Asclepias vestita	Rare
Aster frondosus	Rare
Aster greatae	Rare
Aster subulatus var. ligulatus	Rare
Astragalus pachypus var. pachypus	Rare
Atriplex serenana var. serenana	Rare
Azolla filiculoides	Uncommon
Baccharis emoryi	Uncommon
Barbarea orthoceras var. dolichocarpa	Uncommon
Berberis nevinii	Rare (evidence that the population in San Francisquito Canyon was originally planted by Theodore Payne after 1928 flood)
Bowlesia incana	Rare
Brickellia nevinii	Uncommon
Bromus orcuttianus var. hallii	Rare
Callitriche marginata	Rare
Calochortus plummerae	Rare
Calochortus splendens	Rare
Calystegia macrostegia ssp. intermedia	Uncommon
Calystegia malacophylla ssp. pedicellata	Uncommon
Camissonia confusa	Rare
Camissonia micrantha	Rare
Cardamine californica var. californica	Uncommon
Cardamine californica var. integrifolia	Uncommon
Carex diandra	Rare
Carex lanuginose	Rare
Carex multicaulis	Rare
Carex praegracilis	Uncommon
Carex schottii	Rare
Carex senta	Rare
Castilleja affinis X Castilleja foliolosa	Rare
Castilleja chromosa	Rare
Castilleja linariifolia	Rare
Castilleja plagiotoma	Rare
Caulanthus amplexicaulis var. amplexicaulis	Uncommon
Caulanthus cooperi	Rare
Caulanthus lasiophyllus var. lasiophyllus	Uncommon
Caulanthus lasiophyllus var. utahense	Uncommon
Ceanothus crassifolius X Ceanothus cuneatus var. cuneatus	Rare
Centaurium venustum	Uncommon
Chamaescyce serpyllifolia var. serpyllifolia	Rare
Chenopodium dessicatum	Uncommon
Chorizanthe brevicornu var. brevicornu	Rare
Chorizanthe breweri	Rare
Chorizanthe parryi var. fernandina	Rare
Chorizanthe parryi var. parryi	Rare
Chrysothamnus nauseosus ssp. bernardinus	Rare
Chrysothamnus teretifolius	Uncommon
Clarkia bottae	Uncommon
Clarkia epilobioides	Uncommon
Claytonia parviflora ssp. utahensis	Rare
Collinsia parviflora	Rare
Conyza coulteri	Uncommon
Corethrogyne filaginifolia var. pinetorum	Uncommon
Cornus glabrata	Rare
Cornus sericea ssp. sericea	Rare
Cryptantha micrantha	Uncommon
Cryptantha oxygona	Uncommon
Cryptantha simulans	Uncommon
Cyperus eragrostis	Uncommon
Deschampsia danthodioides	Uncommon
Dodecahema leptoceras	Rare
Dodecatheon clevelandii ssp. sanctarum	Rare
Draba cuneifolia	Rare
Draba verna	Rare
Eclipta prostrata	Rare
Elatine chilensis	Rare
Eleocharis macrostachya	Uncommon
Elymus stebbinsii	Rare
Epilobium pygmaeum	Rare
Equisetum hyemale ssp. affine	Uncommon
Equisetum telmateia ssp. braunii	Uncommon
Eragrostis mexicana ssp. virescens	Rare
Eragrostis pectinacea var. pectinacea	Uncommon
Eriastrum filifolium	Uncommon
Eriastrum sparsiflorum	Uncommon
Ericameria cooperi ssp. cooperi X Ericameria linearifolia	Rare
Ericameria cuneata	Rare
Ericameria palmeri var. pachylepis	Uncommon
Eriodictyon trichocalyx var. trichocalyx	Rare
Eriogonum brachynathum	Rare
Eriogonum inerme var. hispidulum	Rare
Eriogonum maculatum	Uncommon
Eriogonum mohavense	Rare
Eriogonum ordii	Rare
Eriogonum nudum var. westonii	Uncommon
Eriogonum parishii	Rare
Eriogonum pusillum	Rare
Eriogonum trichopes	Rare
Eriogonum wrightii var. trachygonum	Uncommon
Eriophyllum pringlei	Uncommon
Eriophyllum wallacei	Uncommon
Erodium macrophyllum	Rare
Eschscholzia minutiflora	Uncommon
Filago depressa	Rare
Forestiera pubescens	Uncommon
Frankenia salina	Rare
Fraxinus dipetala	Uncommon
Fraxinus velutina	Uncommon
Fritillaria biflora	Rare
Gilia aliquanta ssp. aliquanta	Rare
Gilia diegensis	Rare
Gilia latiflora ssp. cuyamensis	Rare
Gilia malior	Rare
Gilia minor	Rare
Githopsis diffusa	Rare (only one herbarium record)
Gnaphalium bicolor	Rare
Gnaphalium microcephalum	Rare
Gnaphalium stramineum	Uncommon
Gnaphalium thermale	Uncommon
Grindelia camporum var. bracteosa	Uncommon
Harpagonella palmeri	Uncommon
Hazardia squarrosa var. obtusa	Uncommon
Helianthus californicus	Uncommon
Hemizonia kelloggii	Uncommon
Heracleum lanatum	Rare
Hesperocnide tenella	Rare
Hesperolinon micranthum	Rare
Heterotheca sessiliflora ssp. echioides	Rare
Hoita orbicularis	Rare
Hordeum brachyantherum ssp. californicum	Rare
Hordeum intercedens	Uncommon
Hypericum formosum var. scouleri	Rare
Isopyrum occidentale	Uncommon
Juglans californica var. californica	Rare
Juncus balticus	Uncommon
Juncus torreyi	Rare
Lastarriaea coriacea	Rare
Layia platyglossa	Uncommon
Lemmonia californica	Rare
Lemna minor	Uncommon
Lemna minuscule	Uncommon
Lepidium fremontii	Uncommon
Lepidium nitidum var. nitidum	Uncommon
Lepidium virginicum var. pubescens	Uncommon
Leptochloa fascicularis	Rare
Linanthus aureus ssp. aureus	Uncommon
Linanthus brevicaulus	Rare
Linanthus parryae	Rare
Linanthus pygmaeus	Uncommon
Lithophragma affine	Rare
Loeflingia squarrosa var. squarrosa	Rare
Loeseliastrum mathewsii	Rare
Lomatium californicum	Uncommon
Lomatium californicum X L. dissectum var. multifidum	Rare
Lomatium dissectum var. multifidum	Uncommon
Lotus hamatus	Rare
Lupinus albifrons var. eminens	Uncommon
Lupinus benthamii	Uncommon
Lupinus concinnus ssp. concinnus	Uncommon
Lupinus concinnus ssp. orcuttii	Rare
Lupinus latifolius ssp. parishii	Rare
Lupinus sparsiflorus X Lupinus truncatus	Rare
Madia exigua	Uncommon
Madia gracilis	Uncommon
Malacothrix coulteri	Rare
Malacothrix glabrata	Rare
Malosma laurina	Rare
Malvella leprosa	Uncommon
Marsilea vestita	Rare
Melica stricta	Rare
Mentzelia affinis	Uncommon
Mentzelia gracilenta	Rare
Mentzelia laevicaulis	Uncommon
Microseris douglasii ssp. douglasii	Rare
Mimulus androsaceus	Uncommon
Mimulus latidens	Uncommon
Mimulus parishii	Rare
Mirabilis multiflora var. pubescens	Rare
Monardella breweri	Rare
Muhlenbergia microsperma	Rare
Navarretia atractyloides	Rare
Navarretia fossalis	Rare
Navarretia jaredii	Rare
Nemacladus ramosissima	Uncommon
Nicotiana attenuata	Rare
Opuntia echinocarpa	Rare
Opuntia littoralis	Rare
Opuntia vaseyi	Rare
Orcuttia californica	Rare
Orobanche parishii ssp. parishii	Rare
Orthocarpus purpurascens var. pallidus	Rare
Oryzopsis hymenoides	Rare
Paeonia californica	Uncommon
Panicum capillare	Uncommon
Parietaria hespera var. hespera	Rare
Paspalum distichum	Rare
Pectocarya recurvata	Uncommon
Pentagramma triangularis ssp. maxonii	Uncommon
Petalonyx thurberi ssp. thurberi	Uncommon
Phacelia brachyloba	Rare
Phacelia ciliata	Uncommon
Phacelia douglasii	Uncommon
Phacelia longipes	Uncommon
Phacelia viscida	Uncommon (fire follower)
Phoradendron californicum	Rare
Pilularia americana	Rare
Pinus coulteri	Uncommon
Pinus ponderosa	Uncommon
Plagiobothrys acanthocarpus	Rare
Plagiobothrys arizonicus X Plagiobothrys nothofulvus	Rare
Plantago patigonica	Rare
Platanthera dilatata var. leucostachys	Rare
Polypodium californicum	Rare
Potentilla glandulosa ssp. glandulosa	Rare
Potentilla glandulosa ssp. reflexa	Rare
Prunus fasciculata	Uncommon
Purshia tridentata var. glandulosa	Rare
Pycnanthemum californicum	Rare
Quercus wislizenii var. wislizenii	Uncommon
Ranunculus aquatilis var. capillaceus	Rare
Ranunculus cymbalaria ssp. saximontanus	Rare
Rhus trilobata var. anisophylla	Rare
Rhus trilobata var. anisophylla X Rhus trilobata var. pilosissima	Rare
Rhus trilobata var. pilosissima	Rare
Ribes malvaceum var. malvaceum	Uncommon
Ribes nevadense	Rare
Rorippa curvisiliqua	Rare
Rumex salicifolius var. denticulatus	Rare
Salvia carduacea	Uncommon
Salvia leucophylla X Salvia mellifera	Rare
Scirpus americanus	Uncommon
Scirpus maritimus	Uncommon
Scirpus pungens	Uncommon
Scirpus robustus	Uncommon
Senecio californicus	Uncommon
Sesuvium verrucosum	Rare
Setaria gracilis	Uncommon
Sidalcea malvaeflora ssp. malvaeflora	Rare
Sidalcea neomexicana ssp. thurberi	Rare
Silene antirrhina	Rare
Sisyrinchium bellum	Rare
Solanum americanum	Rare
Solanum douglasii	Rare
Sphaeralcea emoryi	Rare
Sporobolus airoides	Rare
Stillingia linearifolia	Rare
Stipa latiglumis	Rare
Stylocline masonii	Rare
Stylocline psilocarphoides	Rare
Symphoricapros mollis	Rare
Tetradymia axillaries var. longispina	Uncommon
Tetradymia comosa	Uncommon
Thysanocarpus laciniatus var. hitchcockii	Uncommon
Thysanocarpus laciniatus var. laciniatus	Uncommon
Trifolium ciliolatum	Rare
Trifolium microcephalum	Uncommon
Trifolium variegatum	Uncommon
Triodanis biflora	Uncommon
Typha latifolia	Uncommon
Verbena lasiostachys ssp. lasiostachys	Rare
Veronica peregrina ssp. xalapensis	Uncommon
Vicia hassei	Uncommon
Viola purpurea ssp. mohavensis	Uncommon
Viola purpurea ssp. venosa	Uncommon
Xylorhiza tortifolia	Uncommon
Yabea microcarpa	Uncommon
Yucca brevifolia var. brevifolia	Uncommon
Zannichellia palustris	Uncommon

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CNPS welcomes your comments and suggestions about locally rare plants. In efforts to always maintain current, up-to-date, and accurate data, please submit your observations on the native and naturalized plants in the Channel Islands Chapter region. Your input is greatly appreciated.