- Madia
- Picture 1
- Picture 2
- Maiden-hair fern
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Malacothrix
- Manroot
- Picture 1
- Picture 2
- Marsh baccharis
- Picture 1
- Picture 2
- Matilija poppy
- Picture 1
- Picture 2 (fruits)
- Picture 3
- Picture 4
- Picture 5
- Mayweed
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Meadow fescue
- Meadow lotus
- Meadow nemophila
- Meadow-rue
- Picture 1 (male)
- Picture 2 (female)
- Mediterranean grass
- Microseris
- Milk thistle
- Picture 1
- Picture 2 (seeds)
- Picture 3
- Picture 4
- Picture 5 (leaves)
- Picture 6 (leaves)
- Picture 7
- Milkvetch
- Picture 1
- Picture 2
- Milkwort
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
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- Miner's lettuce
- Picture 1
- Picture 2
- Picture 3
- Miniature lupine
- Picture 1
- Picture 2
- Mistletoe
- Picture 1
- Picture 2 (on sycamore)
- Picture 3 (on sycamore)
- Mock heather
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Monterey cypress
- Mosquito fern
- Picture 1
- Picture 2
- Moth mullein
- Mountain mahogany
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Mouse-ear chickweed
- Muilla
- Mule fat
- Picture 1
- Picture 2
- Picture 3
- Mules ears
- Picture 1
- Picture 2
- Picture 3
- Musk flower
- Mustard primrose
- Picture 1
- Picture 2
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