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| Family Apocynaceae |
| Periwinkle * Vinca major Family: Apocynaceae (Dogbane). Backbone Trail between Zuma Ridge Trail and Kanan Trailhead: riparian woodland, 4-26-04. Note: Invasive exotic. |
| Family Asteraceae |
| Chicory * Cichorium intybus Family: Asteraceae (Sunflower). Rocky Oaks: Rocky Oaks Loop Trail, valley grassland, 9-8-04. |
| Fleabane Aster Erigeron foliosus var. foliosus Family: Asteraceae (Sunflower). Other common names: leafy fleabane. Malibu Creek State Park: Mott Road, disturbed grassland, June 2005. |
| Woolly Aster Lessingia filaginifolia Family: Asteraceae (Sunflower). Circle X Ranch: Grotto Trail, chaparral, 2-29-04. |
| San Diego Milk-aster Stephanomeria diegensis Family: Asteraceae (Sunflower). Circle X Ranch: Mishe Mokwa Trail, oak woodland, 8-26-04. |
| Whiteplume Wirelettuce Stephanomeria exigua ssp. coronaria Family: Asteraceae (Sunflower). Rancho Sierra Vista/Satwiwa: Near Equestrian parking lot, disturbed grassland, June 2005. |
| Twiggy Wreath Plant Stephanomeria virgata Family: Asteraceae (Sunflower). Circle X Ranch: Flagpole Overlook, sage scrub, 8-31-04. |
| Family Boraginaceae |
| Wild Heliotrope Heliotropium curassavicum Family: Boraginaceae (Borage). Point Mugu State Park: Big Sycamore Canyon Trail, oak woodland, 7-1-04. |
| Family Brassicaceae |
| Sea Rocket * Cakile maritima Family: Brassicaceae (Mustard). Point Mugu State Park: Thornhill Broome Beach, Coastal Strand, 6-9-04. |
| Lace-pod Thysanocarpus curvipes Family: Brassicaceae (Mustard). Other common names: sand fringepod, hairy fringe-pod. Circle X Ranch: Sandstone peak Trail, rocky slopes, March 2008.. |
| Narrow-leaved Fringe-pod Thysanocarpus laciniatus Family: Brassicaceae (Mustard). Other common names: mountain fringepod. Circle X Ranch: Grotto Trail, riparian woodland, March 2008.. |
| Family Campanulaceae |
| Southern Blue-cup Githopsis diffusa ssp. diffusa Family: Campanulaceae (Bellflower). Other common names: San Gabriel bluecup. NPS lands west of Malibu State Park: oak woodland, May 2005. |
| Rothrock's Lobelia Lobelia dunnii var. serrata Family: Campanulaceae (Bellflower). Circle X Ranch: riparian woodland, 7-29-04. |
| Family Convolvulaceae |
| Common Morning Glory * Ipomoea purpurea Family: Convolvulaceae (Morning-glory). PCH roadside near Point Dume: Disturbed urban interface, April 2006. |
| Family Fabaceae |
| Leather Root Hoita macrostachya Family: Fabaceae (Pea). Point Mugu State Park: Waterfall Trail, riparian woodland, 8-6-04. |
| Bajada Lupine Lupinus concinnus Family: Fabaceae (Pea). Circle X Ranch: Campground, oak woodland/disturbed, March 2004. |
| Stinging Lupine Lupinus hirsutissimus Family: Fabaceae (Pea). Circle X Ranch: Yerba Buena Road roadside, chaparral, 2-17-04. |
| Broad-leaved Lupine Lupinus latifolius Family: Fabaceae (Pea). Hidden Valley: oak woodland, 4-30-04. |
| Bush Lupine Lupinus longifolius Family: Fabaceae (Pea). Circle X Ranch: Mishe Mokwa Trail, sage scrub, 4-10-04. |
| Valley Lupine Lupinus microcarpus Family: Fabaceae (Pea). Soka University: May 2006. |
| Coulter's Lupine Lupinus sparsiflorus Family: Fabaceae (Pea). Cheeseboro/Palo Comado Canyons: Sheep Corral Trail, burned chaparral, May 2006. |
| Succulent Lupine Lupinus succulentus Family: Fabaceae (Pea). Circle X Ranch: Yerba Buena Road roadside, chaparral, 2-14-04. |
| Collar Lupine Lupinus truncatus Family: Fabaceae (Pea). Other common names: collared annual lupine. Circle X Ranch: Yerba Buena Road roadside, disturbed shoulder margin, March 2005. |
| Alfalfa * Medicago sativa Family: Fabaceae (Pea). Backbone Trail between Zuma Ridge Trail and Kanan Trailhead: oak woodland, 7-14-06. |
| Spring Vetch * Vicia sativa Family: Fabaceae (Pea). Circle X Ranch: Grotto Trail, riparian woodland, 3-18-04. |
| Family Geraniaceae |
| Long-beaked Filaree * Erodium botrys Family: Geraniaceae (Geranium). Backbone Trail between Latigo and Corral Trailheads, riparian woodland, 4-16-04. |
| Red-stem Filaree * Erodium cicutarium Family: Geraniaceae (Geranium). Circle X Ranch: Campground roadside, sage scrub, 2-24-04. |
| White-stem Filaree * Erodium moschatum Family: Geraniaceae (Geranium). Circle X Ranch: Campground roadside, sage scrub, 3-12-04. |
| Family Hydrophyllaceae |
| Yerba Santa Eriodictyon crassifolium Family: Hydrophyllaceae (Waterleaf). Circle X Ranch: Yerba Buena Road roadside, chaparral, 4-30-04. |
| Baby Blue-eyes Nemophila menziesii Family: Hydrophyllaceae (Waterleaf). Stunt Ranch: Stunt High Trail, riparian woodland, March 2005. |
| Caterpillar Phacelia Phacelia cicutaria Family: Hydrophyllaceae (Waterleaf). Circle X Ranch: New Backbone Trail, chaparral, 4-8-04. |
| Fern-leaf Phacelia Phacelia distans Family: Hydrophyllaceae (Waterleaf). Backbone Trail between Latigo and Corral Trailheads: oak woodland, 4-16-04. |
| Large-flowered Phacelia Phacelia grandiflora Family: Hydrophyllaceae (Waterleaf). Mulholland Highway roadside: chaparral, 4-18-04. |
| Parry's Phacelia Phacelia parryi Family: Hydrophyllaceae (Waterleaf). Circle X Ranch: Canyon View Trail, sage scrub, 3-13-04. |
| Branching Phacelia Phacelia ramosissima Family: Hydrophyllaceae (Waterleaf). Circle X Ranch: Sandstone Peak Trail, oak woodland, 6-7-04. |
| Sticky Phacelia Phacelia viscida Family: Hydrophyllaceae (Waterleaf). Backbone Trail between Trippet Ranch and Will Rogers State Parks: chaparral, 6-12-04. |
| Fiesta Flower Pholistoma auritum Family: Hydrophyllaceae (Waterleaf). Circle X Ranch: Grotto Trail, riparian woodland, 3-18-04. |
| Family Iridaceae |
| Blue-eyed Grass Sisyrinchium bellum Family: Iridaceae (Iris). Circle X Ranch: Grotto Trail, valley grassland, 4-5-04. |
| Family Lamiaceae |
| Henbit * Lamium amplexicaule Family: Lamiaceae (Mint). Circle X Ranch: Yerba Buena Road roadside, chaparral 2-23-04. |
| Chia Salvia columbariae Family: Lamiaceae (Mint). Circle X Ranch: Yerba Buena Road roadside, chaparral, 3-10-04. |
| Purple Sage Salvia leucophylla Family: Lamiaceae (Mint). Circle X Ranch: Yerba Buena Road roadside, sage brush, 5-7-04. |
| Black Sage Salvia mellifera Family: Lamiaceae (Mint). Circle X Ranch: Campground roadside, sage scrub, 3-14-04. |
| Skullcap Scutellaria tuberosa Family: Lamiaceae (Mint). Circle X Ranch: Mishe Mokwa Trail, sage scrub, 3-13-04. |
| Hedge-nettle Stachys bullata Family: Lamiaceae (Mint). Circle X Ranch: New Backbone Trail, chaparral, 4-8-04. |
| Woolly Blue-curls Trichostema lanatum Family: Lamiaceae (Mint). Circle X Ranch: Sandstone Peak Trail, sage scrub, 3-16-04. |
| Vinegar Weed Trichostema lanceolatum Family: Lamiaceae (Mint). Triunfo Canyon Park: sage scrub, 7-8-04. |
| Family Liliaceae |
| Blue Dicks Dichelostemma capitatum Family: Liliaceae (Lily). Circle X Ranch: Grotto Trail, valley grassland, 3-8-04. |
| Family Lythraceae |
| California Loosestrife Lythrum californicum Family: Lythraceae (Loosestrife). Circle X Ranch: Canyon View Trail, intermittent streambed, 6-18-04. |
| Family Nyctaginaceae |
| Wishbone Bush Mirabilis californica Family: Nyctaginaceae (Four O'Clock). Circle X Ranch: Grotto Trail, chaparral, 3-1-04. |
| Family Onagraceae |
| Purple Clarkia Clarkia purpurea Family: Onagraceae (Evening Primrose). Circle X Ranch: Canyon View Trail, riparian woodland, 5-4-04. |
| Family Orobanchaceae |
| Broomrape Orobanche uniflora Family: Orobanchaceae (Broomrape). Malibu Creek State Park: valley grassland, 4-16-04. |
| Family Plumbaginaceae |
| Sea-Lavender * Limonium perezii Family: Plumbaginaceae (Leadwort). PCH roadside near Point Dume: Disturbed urban interface, April 2006. |
| Family Polemoniaceae |
| Perennial Wool Star Eriastrum densifolium Family: Polemoniaceae (Phlox). Backbone Trail between Latigo and Corral Trailheads: sage scrub, July 2005. |
| Sapphire Wool Star Eriastrum sapphirinum Family: Polemoniaceae (Phlox). Triunfo Canyon Park: Pentachaeta Trail, coastal sage scrub, 7-8-04. |
| Angel's Gilia Gilia angelensis Family: Polemoniaceae (Phlox). Cheeseboro/Palo Comado Canyons: China Flat Trail, burned chaparral, April 2006. |
| Globe Gilia Gilia capitata Family: Polemoniaceae (Phlox). Circle X Ranch: Canyon View Trail, sage scrub, 3-18-04. |
| Purplespot Gilia Gilia clivorum Family: Polemoniaceae (Phlox). Peter Strauss Ranch: ranch area, disturbed roadside, March 2005. |
| Splendid Gilia Gilia splendens Family: Polemoniaceae (Phlox). Cheeseboro/Palo Comado Canyons: Sheep Corral Trail, burned chaparral, April 2006. |
| Downy Navarretia Navarretia pubescens Family: Polemoniaceae (Phlox). Other common names: downy pincushionplant. Paramount Ranch: Medea Creek Trail, valley grassland, June 2007. |
| Family Primulaceae |
| Shooting Star Dodecatheon clevelandii Family: Primulaceae (Primrose). Circle X Ranch: Backbone Trail, sage scrub, 2-17-04. |
| Family Ranunculaceae |
| Blue Larkspur Delphinium patens Family: Ranunculaceae (Buttercup). Other common names: zigzag larkspur. Circle X Ranch: Grotto Trail, riparian woodland, February 2004. |
| Family Rhamnaceae |
| White Thorn Ceanothus leucodermis Family: Rhamnaceae (Buckthorn). Other common names: chaparral whitethorn. Circle X Ranch: Mishe Mokwa Trail, chaparral, March 2005. |
| Bigpod Ceanothus Ceanothus megacarpus Family: Rhamnaceae (Buckthorn). Circle X Ranch: Sandstone peak Trail, chaparral, 2-24-04. |
| Hairy-leaved Ceanothus Ceanothus oliganthus Family: Rhamnaceae (Buckthorn). Circle X Ranch: Mishe Mokwa Trail, chaparral, 3-13-04. |
| Greenbark Ceanothus Ceanothus spinosus Family: Rhamnaceae (Buckthorn). Circle X Ranch: Grotto Trail, riparian woodland, 3-5-04. |
| Family Scrophulariaceae |
| Twining Snapdragon Antirrhinum kelloggii Family: Scrophulariaceae (Figwort). Circle X Ranch: Canyon View Trail, sage scrub, 2-12-05. |
| Purple Owl's Clover Castilleja exserta Family: Scrophulariaceae (Figwort). Circle X Ranch: Mishe Mokwa Trail, sage scrub, 3-13-04. |
| Chinese Houses Collinsia heterophylla Family: Scrophulariaceae (Figwort). Circle X Ranch: Grotto Trail, riparian woodland, 3-18-04. |
| Blue-eyed Mary Collinsia parryi Family: Scrophulariaceae (Figwort). Cheeseboro/Palo Comado Canyons: Sheep Corral Trail, burned chaparral, April 2006. |
| Fluellin * Kickxia elatine Family: Scrophulariaceae (Figwort). Other common names: sharpleaf cancerwort. Mulholland Highway roadside: disturbed roadside, June 2005. |
| Blue Toadflax Linaria canadensis Family: Scrophulariaceae (Figwort). Cheeseboro/Palo Comado Canyons: China Flat Trail, burned chaparral, March 2006. |
| Foothill Penstemon Penstemon heterophyllus Family: Scrophulariaceae (Figwort). Westlake Blvd. roadside: oak woodland, 5-9-04. |
| Notable Penstemon Penstemon spectabilis var. subviscosis Family: Scrophulariaceae (Figwort). Backbone Trail between Trippet Ranch and Will Rogers State Parks: chaparral, 6-12-04. |
| Water Speedwell * Veronica anagallis-aquatica Family: Scrophulariaceae (Figwort). Circle X Ranch: Canyon View Trail, riparian woodland, 5-4-04. |
| Persian Speedwell * Veronica persica Family: Scrophulariaceae (Figwort). Soka University: May 2006. |
| Family Solanaceae |
| Datura Datura wrightii Family: Solanaceae (Nightshade). Mulholland Highway roadside: chaparral, 4-18-04. |
| Purple Nightshade Solanum xanti Family: Solanaceae (Nightshade). Circle X Ranch: Grotto Trail, oak woodland, 2-23-04. |
| Family Valerianaceae |
| Long-spurred Plectritic Plectritis ciliosa Family: Valerianaceae (Valerian). Malibu Creek State Park: valley grassland, 4-14-04. |
| Family Verbenaceae |
| Common Vervain Verbena lasiostachys Family: Verbenaceae (Vervain). Point Mugu State Park: Big sycamore Canyon Trail, oak woodland, 4-19-04. |