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: 92
Genera: 335
Species: 536
Total Taxa (details): 543

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Probable WAIF in the park, not reproducing (native to Mexico, Arizona, and Texas), iNat Observations; Ron Vanderhoff 724 [IRVC]
WAIF, from a soil pile (native to southern Africa), iNat Observations; Ron Vanderhoff 567 [IRVC]
NATIVE, Note: included here as distinct from A. haematochiton, with which it is sometimes considered conspecific.; Ron Vanderhoff 833 [IRVC]
Amaranthus albus L. - White Tumbleweed
NATURALIZED (native to central North America), iNat Observations; Michael G. Simpson 4484 [IRVC]
Atriplex semibaccata R. Br. - Australian Saltbush
NATURALIZED (native to Australia), iNat Observations; Ron Vanderhoff 750 [IRVC]
Blitum californicum S. Wats. - California Goosefoot
NATIVE Note: See Fuentes-Bazan, et al. 2012. Willdenowia 42:5-24; a recent name change from Chenopodium californicum, iNat Observations; Merrill, Roy 29 [UCSB]
NATURALIZED (native to Europe). Note: See Fuentes-Bazan, et al. 2012; a recent name change from Chenopodium murale, iNat Observations; Ron Vanderhoff 550 [IRVC]
Chenopodium album L. - Lamb's Quarters
NATURALIZED (probably native to Europe), iNat Observations; Michael G. Simpson 4675 [IRVC]
NATURALIZED (native to tropical America); Ron Vanderhoff 587 [IRVC]
Salsola australis R. Br. - Australian Tumbleweed
NATURALIZED (possibly native to Australia), iNat Observations; Michael G. Simpson 4676 [IRVC]
NATIVE, Note: Rhus integrifolia X ovata hybrids are documented in the Park; see under Rhus integrifolia for documentation. 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, Tall Sock-destroyer
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, Short Sock-destroyer
NATURALIZED (native to Eurasia, especially Mediterranean); Fred M. Roberts 2924 [IRVC]
Asclepias californica Greene - California/Round-Hood Milkweed
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 [OBS]
PERSISTING FROM CULTIVATION (native locality unclear, possibly southwest Asia), iNat Observations; Fred M. Roberts 6107 [RSA], Ron Vanderhoff 449 [IRVC]
Vinca major L. - Greater Periwinkle
NATURALIZED (probably native to Europe), iNat Observations; Ron Vanderhoff 575 [IRVC]
NATURALIZED (native to Macaronesia, northern Africa); Ron Vanderhoff 762 [IRVC]
Phoenix dactylifera L. - Edible Date Palm
PERSISTING FROM CULTIVATION (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; Ron Vanderhoff 523 [IRVC]
NATURALIZED in the Park. Colony of 30-40 near road and in natural vegetation, could be introduced here., iNat Observations; Ron Vanderhoff 693 [IRVC]
NATURALIZED in the Park. A colony spreading along roadside, CalFlora Observation; Ron Vanderhoff 820 [IRVC]
NATURALIZED (native to Europe), iNat Observation
Centaurea solstitialis - Yellow Star-Thistle
NATURALIZED; under aggressive management in the area (native to southern Europe), iNat Observations; Ron Vanderhoff 584 [IRVC]
NATIVE Note: Treated as a single polymorphic species in the Flora of North America and Jepson eFlora, that concept tentatively accepted here, pending further research. iNat Observations; Michael G. Simpson 4700 [IRVC], Ron Vanderhoff 791 [IRVC], 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]
NATURALIZED (native to western Europe, Mediterranean, southwestern Asia), CalFlora Observations
Native to California, but likely NATURALIZED in the Park, iNat Observations; Ron Vanderhoff 502 [IRVC]
Erigeron bonariensis L. - Flax-Leaf Fleabane
NATURALIZED (native to South America), iNat Observations
Erigeron sumatrensis Retz. - Tropical Horseweed, Asthmaweed
NATURALIZED (native to South America); Michael G. Simpson 4695 [IRVC]
NATURALIZED (native to Southern Africa); Ron Vanderhoff 772 [IRVC]
NATURALIZED (native to Mediterranean); K.G. Marsh s.n. [IRVC]
NATURALIZED (native to Europe), iNat Observations; Ron Vanderhoff 840 [IRVC]
Lactuca serriola L. - Prickly Lettuce
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4652 [IRVC]
Matricaria discoidea DC. - Common Pineapple-Weed
NATIVE (stated as native to northwestern North America, northeastern Asia in Jepson eFlora; considered NATURALIZED in some references), iNat Observations; Michael G. Simpson 4451 [IRVC]
Pluchea odorata (L.) Cass. - Salt Marsh Fleabane
Pluchea odorata var. odorata - Salt Marsh Fleabane
NATIVE, Note: only Pluchea odorata var. odorata treated as occurring in CA in the Jepson Manual and in FNA. iNat Observations; Fred M. Roberts 6114 [RSA], Ron Vanderhoff 650 [IRVC]
Psilocarphus tenellus Nutt. - Slender Woolly-Marbles
Pulicaria paludosa Link - Spanish False-Fleabane
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4569 [IRVC]
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]
Stephanomeria exigua - Small Wreath-Plant
PERSISTING FROM CULTIVATION (native Mexico to South America); Ron Vanderhoff 577 [IRVC]
Echium candicans L. fil. - Pride of Madeira
WAIF (native to Madeira, Macaronesia); Three plants at roadside leading to quarry., iNat Observations; Ron Vanderhoff 692 [IRVC]
NATIVE Note: Some iNaturalist observations only to species, but this subspecies is the only one reported in North America; also treated as P. l. var. ferocula., iNat Observations; iNat Observations; Fred M. Roberts, Jr. 1205 [UCSB]
NATIVE Note: Variety not determined, iNat Observations
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4532 [IRVC]
NATURALIZED (native to Mediterranean, southwestern Asia), iNat Observations; Ron Vanderhoff 723 [IRVC]
NATURALIZED (native to Eurasia), iNat Observations; Ron Vanderhoff 744 [IRVC]
Cardamine hirsuta L. - Hairy Bittercress
NATURALIZED (native to Europe); Ron Vanderhoff 777 [IRVC]
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); Ron Vanderhoff 745 [IRVC], H. Camp 2 [IRVC]
NATURALIZED (native to Eurasia); Ron Vanderhoff 814 [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; Michael G. Simpson 4419 [SDSU], Michael G. Simpson 4419 [IRVC]
Opuntia oricola Philbrick - Chaparral Prickly-Pear
Cerastium glomeratum Thuill. - Mouse-Ear Chickweed
NATURALIZED (native to Europe), iNat Observations
Silene laciniata Cav. - 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], Ron Vanderhoff 801 [IRVC]
NATURALIZED (native to Mediterranean, Asia), iNat Observations
Stellaria media (L.) Vill. - Common Chickweed
NATURALIZED (native to southwestern Europe), iNat Observations; Ron Vanderhoff 743 [IRVC], Michael G. Simpson 4437 [IRVC]
NATIVE, Note: Infrataxa for this species need verification, awaiting examinations of specimens. iNat Observations; D. T. Okumura 120 [LOB], W. Pequegnat 102 [LA], Ron Vanderhoff 548 [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; Brummitt, R. K. 19994 [CAS], R. K. Brummitt 19994 [RSA], Michael G. Simpson 4582 [IRVC], R.K. Brummitt 19994 [SD], more...
Cuscuta californica var. californica - California/Chaparral Dodder
NATIVE, Environmental Listing: 1B.2 S2 G2; Michael G. Simpson 4474 [IRVC]
NATIVE, Environmental Listing: 1B.2 S2 G2; Ron Vanderhoff 588 [IRVC]
NATIVE, Note: Variety not determined. CalFlora Observation
Equisetum hyemale L. - Western Scouringrush
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], Elora D. Camacho 21 [OBS]
WAIF (native to southwestern Australia); Single plant at roadside leading to quarry.; Ron Vanderhoff 691 [IRVC]
Acmispon americanus (Nutt.) Rydb. - American Lotus, Spanish-Clover
Acmispon strigosus (Nutt.) Brouillet - Bishop’s/Strigose Lotus
NATIVE, Note: Recently treated as Ottleya strigosa (Nutt.) D.D.Sokoloff in Plants of the World Online and iNaturalist. iNat Observations; Fred M. Roberts 3220 [IRVC], Fred M. Roberts 1201 [IRVC]
NATURALIZED (native to southeastern Asia, southwestern Australia). Note: Treated as Paraserianthes lophantha in some works, iNat Observations; Donna Krucki s.n. [UCR], Ron Vanderhoff 579 [IRVC]
NATURALIZED (native to the Mediterranean and Middle East), iNat Observations; Helen Camp s.n. [UCR], Ron Vanderhoff 379 [IRVC]
Probable WAIF (native to N. Central Chile to Uruguay), Note: A recently accepted segregate of Caesalpinia gilliesii (Hook.) D.Dietr. iNat Observations; Ron Vanderhoff 585 [IRVC]
NATURALIZED (native to Europe, northern Africa; cultivated as ornamental); Louis Truong 9 [OBS]
Lotus corniculatus L. - Birdfoot Trefoil
NATURALIZED (native to Eurasia. Note: Some plants Toxic from cyanide-releasing compounds), iNat Observations
Lupinus albifrons Benth. - Silver Bush Lupine
Medicago lupulina L. - Black Medick, Yellow Trefoil
NATURALIZED (native to Europe), iNat Observations; Ron Vanderhoff 566 [IRVC]
NATURALIZED (native to Mediterranean, Europe), iNat Observations; Ron Vanderhoff 741 [IRVC]
NATURALIZED (native to Eurasia; cultivated as forage), iNat Observations
NATURALIZED (native to Mediterranean), iNat Observations; Michael G. Simpson 4534 [IRVC]
PERSISTING FROM CULTIVATION Note: single plant adjacent to maintenance area. Possible waif; origin uncertain. (native to deserts of Arizona, Baja California, South America); Ron Vanderhoff 831 [IRVC]
WAIF (native to Mexico, Guatemala, South America); Fred M. Roberts 2201 [IRVC]
Spartium junceum L. - Spanish Broom
NATURALIZED (native to Mediterranean), iNat Observations; Michael G. Simpson 4674 [IRVC]
NATURALIZED (native to Eurasia, northern Africa), iNat Observations
Vicia sativa L. - narrowleaf vetch
NATURALIZED (native to Mediterranean Europe, possibly Eurasia), Note: plants vegetative, not determined to subtaxa, CalFlora Observation
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 brachycarpum (Godr.) Thell. - shortfruit stork's bill
NATURALIZED (native to southern Europe)
Erodium cicutarium (L.) L'Hér. ex Aiton - Red-Stem Filaree/Storksbill
NATURALIZED (native to Eurasia), iNat Observations; Michael G. Simpson 4412 [IRVC]
Pelargonium × hortorum - Zonal/Fish Geranium
PERSISTING FROM CULTIVATION (Hybrid between Pelargonium inquinans and Pelargonium zonale), iNat Observations; Ron Vanderhoff 582 [IRVC]
Ribes malvaceum Sm. - Chaparral Currant
NATIVE, Note: not identified to variety, two of which are in OC. iNat Observations; Ron Vanderhoff 722 [IRVC], Michael G. Simpson 4715 [IRVC]
Philadelphus lewisii Pursh - Wild Mock Orange
NATIVE to California, but out of range, probable WAIF in the Park, needing verification; Fred Zaebst s.n. [UCR]
Iris germanica L. - German Iris
NATURALIZED (native to NW. Balkan Peninsula), Note: Also treated as Iris x germanica (indicating of hybrid origin), this symbolism optional. iNat Observations; Ron Vanderhoff 823 [IRVC]
NATIVE, Note: Locality of Moran 27197 (& Moran 21796, Styrax redivivus) specimen not certain, possibly not in Park; needs verification with recently collected specimen; Reid Moran 27197 [SD]
NATURALIZED (native to Eurasia), iNat Observations; Ron Vanderhoff 779 [IRVC]
NATURALIZED (native to Europe, n. Africa, and s.w. and c. Asia), iNat Observations; Michael G. Simpson 4678 [IRVC]
NATURALIZED (native to Europe, naturalized from cultivation), iNat Observations; Fred M. Roberts 6120 [RSA], Ron Vanderhoff 648 [IRVC]
Mentha spicata L. - spearmint
NATURALIZED (native to Europe, naturalized from cultivation); Ron Vanderhoff 843 [IRVC]
Monardella hypoleuca A. Gray - thickleaf monardella
PERSISTING FROM CULTIVATION (native to southwest Texas to the Mexican state of San Luis Potosí); Ron Vanderhoff 749 [IRVC]
Salvia spathacea Greene - hummingbird sage
PERSISTING FROM CULTIVATION (native to the larger region, but not this park); Ron Vanderhoff 748 [IRVC]
Calochortus weedii Alph.Wood - Weed's Mariposa Lily
NATURALIZED (native to Europe, Mediterranean, India), iNat Observations; Michael G. Simpson 4476 [IRVC]
NATURALIZED (native to Southern Europe); Ron Vanderhoff 825 [IRVC]
NATIVE. Note: Varieties of this species not recognized in the Jepson eFlora; R. Campbell s.n. [LOB]
Ficus carica L. - Edible Fig
NATURALIZED (native to southwestern Asia); Fred M. Roberts 6118 [RSA]
PERSISTING FROM CULTIVATION (native to northeastern Australia). Note: A recent transfer from Eucalyptus citriodora., iNat Observations; Ron Vanderhoff 719 [IRVC]
Eucalyptus polyanthemos Schauer - Silver Dollar Gum, Red Box
NATURALIZED (native to southeastern Australia), iNat Observations; Ron Vanderhoff 761 [IRVC]
PERSISTING FROM CULTIVATION (native to southeastern Australia), iNat Observations; Ron Vanderhoff 720 [IRVC]
NATURALIZED (native to western Asia); Ron Vanderhoff 583 [IRVC]
Clarkia unguiculata Lindl. - elegant clarkia
NATIVE, Note: A single observation that could be from a seeding or restoration. More details and verification needed. iNat Observations
Epilobium canum (Greene) P.H. Raven - California Fuchsia, Hummingbird Trumpet
Epilobium canum subsp. canum - California Fuchsia, Hummingbird Trumpet
Oenothera elata Kunth - Tall Evening-Primrose
NATIVE, Note: This taxon name not used in the Jepson eFlora, but is in Egger. 2008. Phytologia 90:63-82, and Flora of North America. We accept here (Mark Egger, personal communication). iNat Observations; Ron Vanderhoff 557 [IRVC], Michael G. Simpson 4669 [IRVC], Louis Truong 6 [OBS]
Cordylanthus rigidus (Benth.) Jeps. - Stiffbranch Bird’s Beak
Oxalis pes-caprae L. - African Wood-Sorrel
NATURALIZED (native to southern Africa), iNat Observations; Harrison McGowan 135 [LOB]
Meconella denticulata Greene - Small-Flower Fairy Poppy
Diplacus brevipes (Benth.) G.L.Nesom - Slope Semiphore, Widethroat Yellow Monkeyflower
Phytolacca icosandra L. - Tropical Pokeweed
WAIF (native Mexico to South America), a single plant along roadway to quarry; Ron Vanderhoff 527 [IRVC]
Pinus canariensis C. Sm. - Canary Island pine
NATURALIZED (native to Canary Islands); Ron Vanderhoff 721 [IRVC]
NATURALIZED (native to Europe); Ron Vanderhoff 845 [IRVC]
NATIVE. Note: Recently treated as a species of the genus Sairocarpus, iNat Observations; Melvin Kunkle 72 [LOB], Ron Vanderhoff 850 [IRVC], Elora D. Camacho 24 [OBS]
NATIVE [Linaria canadensis (L.) Chaz., in part, misappl.], iNat Observations
Plantago lanceolata L. - English Plantain, Rib-Grass
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4447 [IRVC]
Limonium sinuatum (L.) Mill. - Wavy Leaf Sea-Lavender
NATURALIZED (native to Mediterranean, western Asia); K. O'Reilly 136 [LOB]
Arundo donax L. - Giant Reed
NATURALIZED (native to Europe), iNat Observations; Ron Vanderhoff 870 [IRVC]
Avena barbata Pott ex Link - Slender Wild Oat
NATURALIZED (native to southern Europe, northern Africa to India), iNat Observations; Michael G. Simpson 4590 [IRVC], Michael G. Simpson 4425 [IRVC], Beecher Crampton 6792 [DAV]
Avena fatua L. - Insipid Wild Oat
NATURALIZED (native to Eurasia), iNat Observations
NATURALIZED (native to southern Europe), iNat Observations; Ron Vanderhoff 396 [IRVC]
NATURALIZED (native to South America); H. Camp 8 [IRVC]
NATURALIZED (native to Europe), iNat Observations; Michael G. Simpson 4621 [IRVC]
Bromus rubens L. - Foxtail Chess, Red Brome
NATIVE. Note: A recent name change from Bromus carinatus Hook. & Arn. See: Jepson eFlora Treatment, iNat Observations
Cenchrus setaceus (Forssk.) Morrone - African Fountain Grass
NATURALIZED (native to Africa) Note: A recent name change from Pennisetum setaceum, iNat Observations; Ron Vanderhoff 496 [IRVC]
NATURALIZED (native to eastern South America), iNat Observations; Ron Vanderhoff 453 [IRVC]
NATIVE, Note: Often treated as Leptochloa fusca subsp. univervia, but we follow the recent treatment by Snow and Peterson. 2012. Phytoneuron 71:1-2.; Ron Vanderhoff 651 [IRVC]
Ehrharta erecta Lam. - Panic Veldt Grass
NATURALIZED (native to southern Africa), iNat Observations; Ron Vanderhoff 838 [IRVC]
Hordeum murinum L. - Wall Barley
NATURALIZED (native to Europe, Mediterranean). Note: 3 varieties listed in the Jepson eFlora, iNat Observations
Paspalum distichum L. - Common Knotgrass
NATURALIZED (native to Mediterranean Europe), CalFlora Observation; Ron Vanderhoff 849 [IRVC]
NATURALIZED (native to southern and western Europe), iNat Observations; Michael G. Simpson 4480 [IRVC], Ron Vanderhoff 472 [IRVC]
Setaria viridis (L.) P. Beauv. - Green Bristle Grass
NATURALIZED (native to Eurasia); Ron Vanderhoff 560 [IRVC]
NATURALIZED (probably native to South America), iNat Observations; Ron Vanderhoff 563 [IRVC]
Gilia capitata Sims - Ball/Bluehead Gilia
NATIVE, Possibly treated as Gilia achilleifolia subsp. abrontanifolia; see Jepson eFlora. Needs clarification. iNat Observations; George K. Helmkamp 1660 [UCR], Ron Vanderhoff 795 [IRVC]
NATIVE, Note: Subspecies not recognized in Jepson eFlora treatment; Jon E. Keeley 25,264 [RSA]
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
NATURALIZED, (origins uncertain, confused); Fred M. Roberts 6102 [RSA]
Rumex crispus L. - Curly Dock
NATURALIZED (native to Eurasia), iNat Observations; Michael G. Simpson 4650 [IRVC]
Portulaca oleracea L. - Common Purslane
NATURALIZED (probably native to eastern hemisphere), iNat Observations; Michael G. Simpson 4485 [IRVC]
Pellaea mucronata (D.C. Eaton) D.C. Eaton - Bird’s Foot Cliff-Brake
Ranunculus californicus Benth. - California Buttercup
Cercocarpus betuloides Nutt. - Birch-Leaf Mountain-Mahogany
PERSISTING FROM CULTIVATION in the Park (native to western Asia); Ron Vanderhoff 451 [IRVC]
NATURALIZED (native to Taiwan); Ron Vanderhoff 773 [IRVC]