| Photo Library | Common: R to S | ||||||
| Common name: | Scientific name: | Plant | Flower | Fruit or Seed | Leaf | Young plant | Other |
| rabbitfoot grass | Polypogon monospeliensis | 47k | 25k | 29k | |||
| ragweed, western | Ambrosia psilostachya | 43k | 17k | 26k | |||
| rush | Juncus spp. | 22k | 22k | 62k | |||
| rye, feral | Secale cereale | 22k | 28k | 53k | |||
| salsify,western | Tragopogon dubius | 33k | 32k | ||||
| saltcedar | Tamarix ramosissima | 43k | 50k 30k | 46k | |||
| sandbur | Cenchrus incertus | 55k | 29k | 43k | |||
| shepherdspurse | Capsella bursa-pastoris | 32k | 47k | 47k | 62k | ||
| speedwell, Persian | Veronica persica | 78k | 25k | 38k | |||
| spurge, leafy | Euphorbia esula | 53k | 21k | 24k | 34k | ||
| spurge, toothed | Euphorbia dentata | 56k | 16k | 25k | |||
| St. Jonhswort | Hypericum perferatum | 24k | 17k | ||||
| starthistle, yellow | Centaurea solstitialis | 43k | 21k | 21k | 50k | ||
| sunflower, common | Helianthus annuus | 22k | 42k | 37k | 17k | ||
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