Sweet Marsh Ragwort
Senecio hydrophiloides
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Water Groundsel
Senecio hydrophilus
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Lambstongue Ragwort
Senecio integerrimus
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Columbia Ragwort
Senecio integerrimus var. exaltatus
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Lambs-tongue Ragwort
Senecio integerrimus var. major
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Pale-yellow Ragwort
Senecio integerrimus var. ochroleucus
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Island Senecio
Senecio lyonii
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Mojave Ragwort
Senecio mohavensis
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Mount Patterson Senecio
Senecio pattersonensis
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Sierra Ragwort
Senecio scorzonella
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Tall Ragwort
Senecio serra
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Tall Ragwort
Senecio serra var. serra
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Broom-like Ragwort
Senecio spartioides
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Arrowhead Butterweed
Senecio triangularis
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Catclaw
Senegalia greggii
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Spiny Senna
Senna armata
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Coves' Cassia
Senna covesii
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Coast Redwood
Sequoia sempervirens
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Adpressa Redwood
Sequoia sempervirens 'Adpressa'
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Aptos Blue Redwood
Sequoia sempervirens 'Aptos Blue'
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Nana Pendula Redwood
Sequoia sempervirens 'Nana Pendula'
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Santa Cruz Redwood
Sequoia sempervirens 'Santa Cruz'
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Soquel Redwood
Sequoia sempervirens 'Soquel'
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Bigpod Sesbania
Sesbania herbacea
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Western Sea-purslane
Sesuvium verrucosum
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Knotroot Bristle Grass
Setaria parviflora
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Silver Buffaloberry
Shepherdia argentea
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Russet Buffaloberry
Shepherdia canadensis
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Dwarf Checkerbloom
Sidalcea asprella
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Harsh Checkerbloom
Sidalcea asprella ssp. asprella
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Pt. Reyes Sidalcea
Sidalcea calycosa
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Vernal Pool Checkerbloom
Sidalcea calycosa ssp. calycosa
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Pt. Reyes Checkerbloom
Sidalcea calycosa ssp. rhizomata
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Redding Checkerbloom
Sidalcea celata
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Owens Valley Checkerbloom
Sidalcea covillei
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Fringed Checkerbloom
Sidalcea diploscypha
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Del Norte Checkerbloom
Sidalcea elegans
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Giant Checkerbloom
Sidalcea gigantea
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Waxy Checkerbloom
Sidalcea glaucescens
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Hartweg's Checkerbloom
Sidalcea hartwegii
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Hickman's Checkerbloom
Sidalcea hickmanii
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Cuesta Pass Checkerbloom
Sidalcea hickmanii ssp. anomala
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Hickman's Checkerbloom
Sidalcea hickmanii ssp. hickmanii
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Parish's Checkerbloom
Sidalcea hickmanii ssp. parishii
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Lake Pillsbury Checkerbloom
Sidalcea hickmanii ssp. pillsburiensis
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Marin Checkerbloom
Sidalcea hickmanii ssp. viridis
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Hairy Checkerbloom
Sidalcea hirsuta
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Keck's Checkerbloom
Sidalcea keckii
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Maple Leaved Checkerbloom
Sidalcea malachroides
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Checker Bloom
Sidalcea malviflora
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Palustre Checkerbloom
Sidalcea malviflora 'Palustre'
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Purpetta Dwarf Checkerbloom
Sidalcea malviflora 'Purpetta'
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Rosaly Dwarf Checkerbloom
Sidalcea malviflora 'Rosaly'
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White Checkerbloom
Sidalcea malviflora 'White'
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Chaparral Checkerbloom
Sidalcea malviflora ssp. californica
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Bear Valley Checkerbloom
Sidalcea malviflora ssp. dolosa
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Dwarf Checkerbloom
Sidalcea malviflora ssp. laciniata
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Checker Mallow
Sidalcea malviflora ssp. malviflora
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Siskiyou Checkerbloom
Sidalcea malviflora ssp. patula
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Purple-stemmed Checkerbloom
Sidalcea malviflora ssp. purpurea