Authors: A project of the University of California Irvine Herbarium (IRVC). Contributors: Robert Allen, James Bailey, Rebecca E. Crowe, Emile Fiesler, Kyle Gunther, Fred Roberts, Michael G. Simpson, Ron Vanderhoff

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Families: 84
Genera: 291
Species: 458
Total Taxa (details): 464
NATURALIZED (native to southern Africa), iNat Observations
Amaranthus albus L. - White Tumbleweed
NATURALIZED (native to central North America), iNat Observations; Michael G. Simpson 4484 [IRVC]
NATURALIZED (native to Europe), iNat Observations
Chenopodium album L. - Lamb's Quarters
NATURALIZED (probably native to Europe), iNat Observations
Salsola australis R. Br. - Australian Tumbleweed
NATURALIZED (possibly native to Australia), iNat Observations
NATIVE. , Note: Rhus integrifolia X ovata hybrids are documented in the Park; see iNat Obs., Herbarium Doc. iNat Observations; Melvin Kunkle 8 [LOB] , Michael G. Simpson 4594 [IRVC]
NATIVE, Note: Rhus integrifolia X ovata hybrids are documented in the Park; see iNat Obs., Herbarium Doc. iNat Observations; Ron Vanderhoff 437 [IRVC]
Schinus molle L. - Peruvian Pepper Tree
NATURALIZED (native to South America), iNat Observations; Ron Vanderhoff 454 [IRVC]
NATURALIZED (native to southern Europe), iNat Observations; Ray Nesheim s.n. [IRVC]
Lomatium dasycarpum - Woolly-Fruit Lomatium
Scandix pecten-veneris L. - Venus’s Shepherd’s Needle
NATURALIZED (native to Mediterranean); Kathy Harper s.n. [UCR] , Kathy Harper s.n. [SD]
Torilis arvensis - Field Hedge-Parsley
NATURALIZED (native to central and southern Europe), iNat Observations; Ron Vanderhoff 382 [IRVC] , Michael G. Simpson 4628 [IRVC]
Torilis nodosa (L.) Gaertner - Knot Hedge-Parsley
NATURALIZED (native to Eurasia, especially Mediterranean); Fred M. Roberts 2924 [IRVC]
NATIVE Note: A recent name change from Funastrum cynanchoides var. hartwegii; see Fishbein and Gandhi. 2018. Novon 26:165-167, iNat Observations; Michael G. Simpson 4578 [IRVC] , Fred M. Roberts Jr. 3222 [IRVC] , Louis Truong 1 [IRVC]
NATURALIZED (native locality unclear, possibly southwest Asia), iNat Observations; Fred M. Roberts... 6107 [RSA] , Ron Vanderhoff 449 [IRVC]
Phoenix dactylifera L. - Edible Date Palm
NATURALIZED (native to northern Africa), iNat Observations; Fred M. Roberts... 6115 [RSA]
NATURALIZED (native to Baja California, Sonora, Mexico), iNat Observations; Fred M. Roberts... 6110 [RSA]
Anthemis cotula L. - Mayweed, Stinkweed, Dog-Fennel
NATURALIZED (native to Europe), iNat Observations
Carduus tenuiflorus - Slender Thistle
NATURALIZED (native to central Europe); H. Camp 7 [IRVC]
NATURALIZED (native to Europe), iNat Observations
Centaurea solstitialis - Yellow Star-Thistle
NATURALIZED (native to southern Europe), iNat Observations
NATIVE Note: Treated as a single polymorphic species in the Flora of North America and Jepson eFlora, tentatively accepted here, pending further research. iNat Observations; Ron Vanderhoff 487 [IRVC]
NATURALIZED (native to Australia), iNat Observations; A.E. Fisher 186 [LOB]
NATURALIZED (native to southern Europe), iNat Observations; Michael G. Simpson 4616 [IRVC]
Erigeron bonariensis L. - Flax-Leaf Fleabane
NATURALIZED (native to South America), iNat Observations
NATURALIZED (native to Mediterranean); K.G. Marsh s.n. [IRVC]
NATURALIZED (native to Europe), iNat Observations
Lactuca serriola L. - Prickly Lettuce
NATURALIZED (native to Europe), iNat Observations
Leptosyne californica Nutt. - California Coreopsis
Matricaria discoidea DC. - Common Pineapple-Weed
NATURALIZED (native to northwestern North America, northeastern Asia), iNat Observations; Michael G. Simpson 4451 [IRVC]
Psilocarphus tenellus Nutt. - Slender Woolly-Marbles
Pulicaria paludosa Link - Spanish False-Fleabane
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4569 [IRVC]
Senecio californicus DC. - California Butterweed
Native to California, out of range for the Park. Presumed WAIF, from one iNaturalist record; needs verification, iNat Observations
Solidago velutina - Velvety Goldenrod
Sonchus asper (L.) Hill - Prickly Sow-Thistle
NATURALIZED, iNat Observations
Sonchus asper subsp. asper - Prickly Sow-Thistle
NATURALIZED (native to Europe); Michael G. Simpson 4638 [IRVC]
Sonchus oleraceus L. - Common Sow-Thistle
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4433 [IRVC]
Stephanomeria exigua - Small Wreath-Plant
Cryptantha clevelandii Greene - Cleveland's Cryptantha
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4532 [IRVC]
NATURALIZED (native to Mediterranean, southwestern Asia), iNat Observations
NATURALIZED (native to Eurasia), iNat Observations
Lepidium nitidum Nutt. - Shining Peppergrass
Lepidium virginicum L. - Virginia Peppercress
Sisymbrium altissimum L. - Tumble Mustard
NATURALIZED (native to Europe), iNat Observations
Sisymbrium irio L. - London Rocket Mustard
NATURALIZED (native to Europe); H. Camp 2 [IRVC]
NATIVE Note: A recent name change from Cylindropuntia californica var. parkeri; see Baker, M. A. and D. J. Pinkava. 2018. Chromosome numbers in some cacti of western North America — IX. Haseltonia 2018:5-29, iNat Observations; iNat Observations; Michael G. Simpson 4419 [SDSU] , Michael G. Simpson 4419 [IRVC]
Opuntia oricola Philbrick - Chaparral Prickly-Pear
Silene laciniata Cav. - Mexican/Southern Pink
Spergula arvensis L. - Stickwort, Starwort
NATURALIZED (native to Europe), iNat Observations
Spergularia bocconi (Scheele) Graebn. - Boccone’s Sand-Spurrey
NATURALIZED (native to southwestern Europe, Mediterranean), iNat Observations; Michael G. Simpson 4475 [IRVC]
NATURALIZED (native to Mediterranean, Asia), iNat Observations
Stellaria media (L.) Vill. - Common Chickweed
NATURALIZED (native to southwestern Europe), iNat Observations; Michael G. Simpson 4437 [IRVC]
NATIVE, Note: The subspecies of Calystegia macrostegia are not recognized in a recent thesis, Namoff, S. M. 2017. Hybridization processes, biogeographic patterns and taxonomic rearrangements within Calystegia (Convolvulaceae). PhD. Claremont Graduate University, Claremont, California, USA, which we follow here. iNat Observations; iNat Observations; Brummitt, R. K. 19994 [CAS] , R. K. Brummitt 19994 [RSA] , Michael G. Simpson 4582 [IRVC] , R.K. Brummitt 19994 [SD] , more...
NATIVE, Environmental Listing: 1B.2 S2 G2; Michael G. Simpson 4474 [IRVC]
Euphorbia maculata L. - Spotted Spurge
NATURALIZED (native to eastern United States), iNat Observations; Michael G. Simpson 4483 [IRVC]
Ricinus communis L. - Castor Bean
NATURALIZED (native to Europe). Note: Highly Toxic: seeds fatal when ingested, iNat Observations; Tim Gottwald s.n. [LOB]
Acmispon americanus (Nutt.) Rydb. - American Lotus, Spanish-Clover
NATURALIZED (native to southeastern Asia, southwestern Australia); Donna Krucki s.n. [UCR]
NATURALIZED (native to the Mediterranean and Middle East), iNat Observations; H. Camp s.n. [UCR] , Ron Vanderhoff 379 [IRVC]
NATURALIZED (native to Europe, northern Africa; cultivated as ornamental); T.W. Mulroy 1866 [IRVC] , Louis Truong 9 [OBS]
Lotus corniculatus L. - Birdfoot Trefoil
NATURALIZED (native to Eurasia. Note: Some plants Toxic from cyanide-releasing compounds), iNat Observations
Medicago lupulina L. - Black Medick, Yellow Trefoil
NATURALIZED (native to Europe), iNat Observations
NATURALIZED (native to Mediterranean, Europe), iNat Observations
NATURALIZED (native to Eurasia; cultivated as forage), iNat Observations
Melilotus indicus (L.) All. - Indian Sweetclover
NATURALIZED (native to Mediterranean); Michael G. Simpson 4534 [IRVC]
NATURALIZED (native to Mexico, Guatemala, South America); Fred M. Roberts 2201 [IRVC]
Spartium junceum L. - Spanish Broom
NATURALIZED (native to Mediterranean), iNat Observations
NATURALIZED (native to Eurasia, northern Africa), iNat Observations
Vicia villosa Roth - Hairy Vetch, Winter Vetch
NATURALIZED (native to Europe), iNat Observations
Quercus agrifolia Née - Coast Live Oak
Erodium botrys (Cav.) Bertol. - Long-Beak Filaree/Storksbill
NATURALIZED (native to southern Europe), iNat Observations; Michael G. Simpson 4414 [IRVC]
Erodium cicutarium (L.) L'Hér. ex Aiton - Red-Stem Filaree/Storksbill
NATURALIZED (native to Eurasia), iNat Observations; Michael G. Simpson 4412 [IRVC]
Ribes indecorum Eastw. - White-Flower Currant
Ribes speciosum Pursh - Fuchsia-Flower Gooseberry
Philadelphus lewisii Pursh - Wild Mock Orange
NATIVE to California, but out of range, possible WAIF in the Park; needs verification; F. Zaebst 4127 [UCR]
Phacelia parryi Torr. - Parry’s Phacelia
NATURALIZED (native to Eurasia), iNat Observations
NATURALIZED (native to Europe, n. Africa, and s.w. and c. Asia), iNat Observations
NATURALIZED (native to Europe, naturalized from cultivation); Fred M. Roberts... 6120 [RSA]
Oenothera elata Kunth - western eveningprimrose
NATIVE Note: This taxon used in the Jepson eFlora. Treated as Castilleja minor subsp. stenantha in some references; needs clarification, iNat Observations; iNat Observations; Louis Truong 6 [OBS]
Diplacus brevipes (Benth.) G.L.Nesom - Slope Semiphore, Widethroat Yellow Monkeyflower
NATURALIZED (native to South America), iNat Observations
NATURALIZED (probably native to South America), iNat Observations
Chorizanthe fimbriata Nutt. - Fringed Spineflower
Chorizanthe procumbens Nutt. - Prostrate Spineflower
Eriogonum gracile Benth. - Slender Buckwheat
Persicaria maculosa Gray - Lady’s Thumb
NATURALIZED (native to Eurasia), iNat Observations
Rumex crispus L. - Curly Dock
NATURALIZED (native to Eurasia); Michael G. Simpson 4650 [IRVC]
Cercocarpus betuloides Nutt. - birch-leaf mountain-mahogany
Populus fremontii S. Watson - Fremont's cottonwood
Salix exigua Nutt. - desert willow
Azolla filiculoides Lam. - Pacific Mosquito Fern
NATURALIZED (native to Eurasia), iNat Observations
NATIVE. Note: Often identified as P. crassifolia or P. greenei, but determined as a form of P. hederifolia by experts. However, may constitute a new species; needs study. See: Pretz and Deanna. 2020. Taxon 69:170-192, iNat Observations; Fred M. Roberts 3242 [IRVC] , Michael G. Simpson 4537 [IRVC]
Solanum nigrum L. - Black Nightshade
NATURALIZED (native to Eurasia); Michael G. Simpson 4527 [IRVC]
Brodiaea filifolia S.Watson - Thread-Leaf Brodiaea
NATIVE. Environmental Listing: 1B.1 S2 G2; H. Camp 11 [IRVC]
Urtica urens L. - Dwarf Nettle
NATURALIZED (native to Europe), iNat Observations
NATIVE. Note: Often treated as Phoradendron leucarpum subsp. macrophyllum, but we follow Mathiasen, R. L. and S. C. Kenaley. 2016. Madroño 63:8-33., iNat Observations
Tribulus terrestris L. - Puncture Vine
NATURALIZED (native to Mediterranean), iNat Observations; Fred M. Roberts... 6103 [RSA]