Authors: This checklist is a project of the UC Irvine Herbarium (IRVC). Please contact collections manager with questions, rcrowe@uci.edu.
Locality: The UCI Ecological Preserve is a 60 acre site on the southern edge of the campus located adjacent University Hills, the Irvine Research Park, and the San Joaquin Transportation Corridor. (33.635490, -117.844850)
Notes: This checklist updates taxonomy and builds on the Bowler and Bramlet 2002 checklist and the unpublished 2010 updated checklist by the same authors. Bowler, P.A. and D. Bramlet. 2002 (issued August, 2003). Vascular plants of the University of Califonria, Irvine Ecological Preserve. Crossosoma 28(2): 27-49.

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Families: 58
Genera: 169
Species: 234
Total Taxa (details): 238

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CSS, G, NATIVE; Perennial
Amaranthus albus L. - White Tumbleweed
NATURALIZED (native to central North America)
Atriplex semibaccata R. Br. - Australian Saltbush
NATURALIZED (native to Australia)
Beta vulgaris L. - common beet
NATURALIZED (native to Southern Europe)
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
Chenopodium album L. - Lamb's Quarters
NATURALIZED (probably native to Europe)
Chenopodium murale L. - Nettle-Leaf Goosefoot
NATURALIZED (native to Europe). Note: See Fuentes-Bazan, et al. 2012; a recent name change from Chenopodium murale; Mark A. Elvin 2244 [UCR]
Salsola tragus L. - tumbleweed
NATURALIZED (Europe to Siberia and Korea)
Schinus terebinthifolius Raddi - Brazilian Pepper Tree
Conium maculatum L. - Common Poison Hemlock
Asclepias fascicularis Decne. - Narrowleaf Milkweed
Ambrosia psilostachya DC. - Western Ragweed
Artemisia californica Less. - Coastal Sagebrush
Persisting from mitigation planting
Encelia californica Nutt. - California Encelia
Erigeron bonariensis L. - Flax-Leaf Fleabane
Gnaphalium palustre Nutt. - Lowland Cudweed
Lactuca serriola L. - Prickly Lettuce
Pluchea odorata (L.) Cass. - Salt Marsh Fleabane
Senecio vulgaris - Common Groundsel
Sonchus asper (L.) Hill - Prickly Sow-Thistle
Sonchus oleraceus L. - Common Sow-Thistle
Brassica rapa L. - Wild Turnip
Lepidium virginicum L. - Virginia Peppercress
Sisymbrium irio L. - London Rocket Mustard
Sisymbrium orientale L. - Oriental Hedge Mustard
Opuntia × occidentalis - Western Prickly-Pear
Stellaria nitens Nutt. - Shining Chickweed
Convolvulus arvensis L. - smallflowered morningglory
Cuscuta californica Hook. & Arn. - California/Chaparral Dodder
Marah macrocarpa (Greene) Greene - Wild Cucumber, Man-root
Croton setiger Hook. - Doveweed, Turkey Mullein
Quercus agrifolia Née - Coast Live Oak
Persisting from mitigation planting
Quercus chrysolepis Liebm. - canyon live oak
Persisting from mitigation planting
Erodium botrys (Cav.) Bertol. - Long-Beak Filaree/Storksbill
Erodium moschatum (L.) L'Hér. ex Aiton - White-Stem Filaree/Storksbill
Phacelia parryi Torr. - Parry’s Phacelia
Transplanted
Scutellaria tuberosa Benth. - Danny's skullcap
Stachys rigida Nutt. ex Benth. - Rigid Hedge-Nettle
Calochortus catalinae S.Watson - Catalina Mariposa Lily
NATIVE; Rare plant rankings: 4.2 S3S4 G3G4, Recorded decades ago and has not been seen for many years. No EP herbarium specimens are documented for Calochortus catalinae.
Lythrum hyssopifolia L. - hyssop loosestrife
*Bowler and Bramlet 2010 note that there are three species of Eucalyptus
Epilobium canum (Greene) P.H. Raven - California Fuchsia, Hummingbird Trumpet
Oxalis pes-caprae L. - African Wood-Sorrel
Diplacus australis McMinn - Southern Monkey Flower
CSS, W, *Diplacus x australis (McMinn ex Munz) Tulig
Plantago elongata Pursh - prairie plantain
Plantago ovata Forssk. - Woolly Plantain
Platanus racemosa Nutt. - Western Sycamore
Persisting from mitigation planting
Limonium perezii (Stapf) F.T. Hubb. - Perez’s Marsh-Rosemary
Avena barbata Pott ex Link - Slender Wild Oat
Bromus diandrus Roth - Ripgut Grass
Festuca myuros L. - Rat-Tail Fescue
Festuca perennis (L.) Columbus & J.P.Sm. - Perennial/Italian Rye Grass
Phalaris minor Retz. - Little-Seed Canary Grass
Schismus barbatus (L.) Thell. - Mediterranean Schismus
Stipa lepida Hitchc. - Foothill Needle Grass
Stipa pulchra Hitchc. - Purple Needle Grass
Rumex crispus L. - Curly Dock
Portulaca oleracea L. - Common Purslane
Adiantum jordanii C.H. Mull. - California Maidenhair Fern
Persisting from mitigation planting
Galium aparine L. - Common Bedstraw, Goose Grass
Salix gooddingii C.R. Ball - Goodding’s Black Willow
Persisting from mitigation planting
Salix lasiolepis Benth. - Arroyo Willow
Planted
Persisting from mitigation planting
Datura wrightii Regel - Western Jimson Weed
Nicotiana quadrivalvis Pursh - Four-Valved Tobacco
Solanum douglasii Dunal - Douglas’s Nightshade
Tamarix ramosissima Ledeb. - Saltcedar Tamarisk
Dipterostemon capitatus (Benth.) Rydb. - Blue Dicks, School Bells
Typha domingensis Pers. - Southern Cattail
Typha latifolia L. - Broad-Leaf Cattail
Parietaria hespera Hinton - Western Pellitory
Urtica urens L. - Dwarf Nettle