- Lactuca saligna
- Picture 1
- Picture 2
- Lactuca serriola
- Picture 1 (leaf midrib)
- Picture 2
- Picture 3
- Lagurus ovatus
- Lamarckia aurea
- Lamium amplexicaule
- Lasthenia californica
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Lathyrus japonica
- Lathyrus jepsonii var. californicus
- Lathyrus vestitus
- Picture 1
- Picture 2
- Picture 3
- Lavatera assurgentiflora
- Picture 1 (Santa Cruz Island)
- Picture 2 (Santa Cruz Island)
- Layia glandulosa
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Layia platyglossa
- Picture 1
- Picture 2
- Lemna minor
- Lepechinia calycina
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Lepidium latifolium
- Picture 1
- Picture 2
- Lepidium nitidum
- Leptodactylon californicum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Lessingia filaginifolia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Lewisia rediviva
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Leymus condensatus
- Lilium humboldtii
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Linanthus ciliatus
- Picture 1
- Picture 2
- Picture 3
- Linanthus dianthiflorus
- Picture 1
- Picture 2
- Linanthus parviflorus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Linaria canadensis
- Linum grandiflorum
- Lithophragma heterophylla
- Lobularia maritima
- Picture 1
- Picture 2
- Picture 3
- Lolium multiflorum
- Picture 1
- Picture 2
- Lolium perenne
- Lomatium dasycarpum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
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- Lomatium lucidum
- Picture 1
- Picture 2
- Picture 3 (fruits)
- Lomatium parvifolium
- Lomatium utriculatum
- Picture 1
- Picture 2
- Lonicera hispidula var. vacillans
- Picture 1
- Picture 2
- Lonicera subspicata var. denudata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Lotus argophyllus
- Picture 1
- Picture 2
- Lotus benthamii
- Picture 1
- Picture 2
- Lotus corniculatus
- Picture 1
- Picture 2
- Picture 3
- Lotus dendroideus (Santa Cruz Island)
- Lotus formosissimus
- Lotus grandiflorus
- Picture 1
- Picture 2
- Lotus purshianus
- Picture 1
- Picture 2
- Lotus salsuginosus
- Picture 1
- Picture 2
- Picture 3
- Lotus scoparius
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Ludwigia peploides
- Picture 1
- Picture 2
- Picture 3
- Lupinus albifrons
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Lupinus arboreus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Lupinus benthamii
- Picture 1
- Picture 2
- Lupinus bicolor
- Picture 1
- Picture 2
- Lupinus concinnus
- Picture 1
- Picture 2
- Lupinus hirsutissimus
- Lupinus microcarpus var. densiflorus
- Picture 1
- Picture 2
- Lupinus nanus
- Lupinus sparsiflorus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Lupinus sparsiflorus Fabaceae
- Lupinus succulentus
- Picture 1
- Picture 2
- Picture 3
- Lupinus truncatus
- Picture 1
- Picture 2
- Lyonothamnus floribundus ssp. asplenifolius
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- Picture 5 (Rare)
- Picture 6 (Rare)
- Lythrum californicum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
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