Native and Introduced Plants of Southern California

Southern California plant species and where to find them Master Checklist Notes on the Scientific Names Used At This Site Regional Floras Plant Guides for Trails Search the Floras and Plant Guides	Analysis Pages Analysis pages from the Borrego Desert site Accuracy of iNaturalist Positions List of Fire Follower Species List of Monsoonal Species Species Abundance Statistics Number Of Total Taxa Vs. Total Trail Length Number Of Taxa Vs. Distance Along A Trail How Common Are The Plants Of Southern California? Most Common Plants Plant Families With the Most Entries in Our Master List Jepson Manual Analysis: Number of Species by Geographic Area Resolved Into The Number Of Taxa From Successively Larger Areas Non-Native Plants Rate of Introduction of New Species With Time At The Santa Rosa Plateau and Riverside County Percentage of Native Taxa Vs. Elevation: see first plot here Distribution of Natives Vs. Non-Natives Most Common Non-Native Plants List of All Non-Native Taxa in Southern California Observed On A Trail Or In A Flora Analysis of Preliminary Cal-IPC Noxious Weed Ratings Analysis of Plants Blooming on the Vernal Pool Trail, Santa Rosa Plateau, Vs. Time from 2001 to 2005 Changes in the Flora of San Jacinto Mountain With Time Dominant Species of Devils Slide Trail and Their Recent Death Rates, San Jacinto Mountains Dominant Species of the West Rim of Tahquitz Valley and Their Recent Death Rates, San Jacinto Mountains Spiral of Wood Grain in Tree Trunks at San Jacinto Mountain Specific Species See also: species of Borrego Desert species of San Jacinto iNat Posts of Interest, including iNat discussions of some species, and individual plants with multiple observations from different dates Achnatherum coronatum / A. parishii Acmispon glaber and A. haydonii (= Lotus scoparius and L. haydonii) Agoseris retrorsa, A. grandiflora, and their hybrid The erect Amaranthus species of San Diego County Anza-Borrego Desert Annuals From Seedling To Flower Aquatic Plants of Jackson Lake, a Pictorial Guide Arctostaphylos (Manzanitas) Arctostaphylos glauca Specimens With Cordate Leaves Post-Fire Pure and Hybrid Offspring from planted Arctostaphylos glauca Analysis of some Arctostaphylos samples in Charlton Flat / Chilao / Three Points Area from SnGb Geographic Distribution of Arctostaphylos Species in the San Gabriel Mountains Arctostaphylos glandulosa subspecies in SnGb from vouchers Arctostaphylos pringlei and A. pungens in the San Jacinto Mountain Area Arctostaphylos glandulosa Subspecies Number of Stone Segments Arctostaphylos parryana ssp. desertica Inflorescences Arctostaphylos parryana ssp. desertica, and comparison to A. glandulosa ssp. adamsii Hybrids of Arctostaphylos patula and A. pringlei in the San Jacinto Mountains Nascent Inflorescences In Arctostaphylos pringlei ssp. drupacea Atriplex canescens varieties Baccharis emoryi / B. pilularis Brassica nigra and Hirschfeldia incana (Mustards): How to Tell The Difference Brickellia californica and B. desertorum Brodiaea Calochortus davidsonianus and C. splendens Calystegia macrostegia subspecies intermedia and tenuifolia are bogus Ceanothus crassifolius, C. cuneatus, C. pauciflorus, and C. perplexans Cheilanthes clevelandii and C. covillei Chorizanthe leptotheca, C. staticoides and C. xanti Chrysothamnus nauseosus (rabbitbrush; includes map of distribution in the San Gabriel Mountains) Chrysothamnus nauseosus ssp. consimilis and mohavensis Clarkia bottae and C. dudleyana Collinsia concolor and C. heterophylla The Cleistogamous Flowers of Collomia grandiflora Corallorhiza maculata Varieties Cryptantha barbigera vars. barbigera, fergusoniae and C. intermedia Cryptantha intermedia and C. muricata varieties Cryptantha micrantha var. lepida and C. similis Distinguishing Cylindropuntia bernardina and C. ganderi Dalea mollis and D. mollissima Dichelostemma capitatum ssp. pauciflorum (Dipterostemon capitatus ssp. pauciflorus) Dudleya arizonica and D. pulverulenta Ehrharta longiflora Eriodictyon species Eriogonum umbellatum varieties in SnGb Galium angustifolium ssp. jacinticum Does Geranium richardsonii Exist In Southern California? Gilias of San Diego County Gilias of Lowermost Tahquitz Canyon, west of Palm Springs Gnaphalium canescens subspecies Gutierrezia (Matchweed) Heucheras of southern California Loeseliastrum matthewsii and L. schottii (desert calico and Schott's calico) Lomatium dasycarpum, woolly-fruited lomatium, and L. mohavense, Mojave lomatium Lupinus Species (Lupines) Lycium Species of the San Diego County Desert Machaeranthera (Dieteria) The Malacothamnus Species of San Diego County, including M. enigmaticus, a new rare species from the desert edge of the Peninsular Range in San Diego County Mentzelia albicaulis and M. montana Mimulus bigelovii and M. fremontii Nama pusilla and Tiquilia nuttallii Nemacladus species of Box Canyon, Mecca Hills (N. glanduliferus, N. orientalis, N. rubescens, N. tenuis) Nemophila menziesii and N. pedunculata geographic distribution maps from vouchers Opuntia (chollas and prickly-pears) Opuntia acanthocarpa var. coloradensis Opuntia bigelovii and O. fosbergii Opuntia echinocarpa, O. ganderi, O. parryi, and O. wolfii Distinguishing Cylindropuntia bernardina and C. ganderi Pictorial Identification Guide Locations Analysis of How Well Non-Blooming Specimens Are Distinguished "Intergradation" between Opuntia parryi and O. ganderi The transition between Opuntia parryi and O. ganderi along Highway S2 in San Diego County Opuntia ganderi In Extreme Northeast San Diego County Pectocarya species of southern California Pectocarya heterocarpa and P. peninsularis Phacelia distans and P. tanacetifolia Phacelia minor with spots like P. parryi Phacelia nashiana = P. campanularia2 Phacelia parryi Flower Duration Phlox austromontana and Phlox diffusa Pilostyles thurberi, Southern California's Most Unusual Wildflower Pinus jeffreyi and P. ponderosa (Yellow Pines) a Two Needle Pinus quadrifolia, in the Thomas Mountains at SnJt, aka "Pinus edulis" Poa annua and P. infirma Potentilla glandulosa subspecies Quercus (Oaks) The "Quercus engelmannii" at Horsethief Creek, Santa Rosa Mountains Quercus spp. (Scrub oaks) Ranunculus californicus and R. occidentalis in the Cuyamaca Lake Area Ranunculus occidentalis at the Santa Rosa Plateau Rhamnus ilicifolia and R. pilosa Ribes indecorum and R. malvaceum Ribes quercetorum Ribes velutinum and R. lasianthum Salix: Key to Willows of Coastal Southern California Below 6000 Feet Elevation Schismus barbatus and S. arabicus Sporobolus species Stephanomeria (twiggy wreath, wand chicory, wirelettuce) Geographic Distribution Stephanomeria diegensis (San Diego wreathplant) Stephanomeria exigua (small wirelettuce) Stephanomeria virgata (twiggy wreath, wand chicory) Symphoricarpos albus var. laevigatus
Bloom Reports from the Anza-Borrego Desert Below 3000 Feet Elevation 2023-2024 Blooms (Latest Report)   The last bloom update of the season from previous years 2022-2023 Blooms 2021-2022 Blooms 2020-2021 Blooms 2019-2020 Blooms 2018-2019 Blooms (No blooms page for 2017-2018 due to extremely-low rainfall) 2016-2017 Blooms 2015-2016 Blooms 2014-2015 Blooms (No blooms page for 2013-2014 due to extremely-low rainfall, except for one report from August 2013 from summer monsoonal rain) 2012-2013 Blooms 2011-2012 Blooms 2010-2011 Blooms 2009-2010 Blooms 2008-2009 Blooms   Links to all the previous Bloom pages throughout each season     Photo Gallery of Desert Species Observed in Bloom
Bloom Reports from San Jacinto Mountain Above 6500 Feet Elevation 2011 Blooms
Regional Information Borrego Desert San Diego County San Gabriel Mountains San Jacinto Mountain Santa Rosa Plateau
Comments on the Jepson Manual and A Flora of Southern California by Munz Comments On Floras and Wildflower Books Latin Name Changes (gives the Munz and other equivalents of the Jepson Manual Latin Names, as well as more recent updates to the Jepson Manual names) Chollas (name changes, distribution, key) Wayne Armstrong's Index Giving Jepson Manual Page Numbers For Plant Families (can be pasted into the JM for quick family look-up)
Botanical Trail Reports (reports from the field, mostly in 2009 and earlier) Beginning in fall 2022, botanical trail reports are included in the 2022-2023 Blooms page for the Anza-Borrego Desert.
General Information How To Identify Plants (for beginners) California Plant Pictures and Databases Interesting Plant Facts Some Things You May Not Have Known About Vouchers Plants Blooming Now in Southern California Interesting Bloom Reports: Comparison of the 2002 Riverside / San Diego County Bloom to the 2001 Bloom An April Bloom In October! California Oaks Unlabeled Plant Links References for pages on this site
A Happy Botanist References for pages on this site Three Letter Abbreviation For Plant Families Master List: Number of trails, lists and taxa vs time and number of taxa found only on a single trail Update Log Native and Introduced Plants of the Grand Canyon, Arizona