- Rabbit's foot grass
- Picture 1
- Picture 2
- Picture 3
- Rancheria clover
- Picture 1
- Picture 2
- Rattlesnake grass
- Rattlesnake weed
- Red brome
- Red clover
- Red fescue
- Red flax
- Red larkspur
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Red top
- Picture 1
- Picture 2
- Red-maids
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Red-skinned wild onion
- Picture 1
- Picture 2
- Picture 3
- Red-spot clarkia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Red-stem filaree
- Picture 1
- Picture 2
- Picture 3
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- Redberry
- Redwood sorrel
- Picture 1
- Picture 2
- Reed grass
- Rein orchid
- Rescue grass
- Ribbon bush
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Ripgut grass
- Rock lettuce
- Rock-rose
- Picture 1
- Picture 2
- Picture 3
- Rose snapdragon
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Rupert's scurf-pea
- Picture 1
- Picture 2
- Rush
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Russian thistle
- Picture 1
- Picture 2
- Picture 3
- Rye
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