| Photo Library | Scientific | ||||||
| Scientific names: | Common names: | Plant | Flower | Fruit or Seed | Leaf | Young plant | Other |
| Chenopodium album | lambsquarters | 46k | 51k | 60k | |||
| Cichorium intybus | chicory | 57k | 40k 25k | 42k | |||
| Cicuta douglasii | hemlock, water | 24k | 10k | 15k | |||
| Cirsium arvense | thistle, Canada | 54k | 32k | 28k | 45k | ||
| Cirsium nutans | thistle, musk | 23k 27k | 13k | ||||
| Conium maculatum | hemlock, poison | 34k | 16k | 34k | |||
| Cuscuta campestris | dodder, field | 62k | 35k | 35k | 29k | ||
| Cynoglossum officinale | houndstoungue | 32k | 23k | 30k | 29k | ||
| Cyperus esculentus | nutsedge, yellow | 44k | 57k | 12k | 69k | ||
| Delphinium nuttallianum | larkspur, low | 40k | 11k | 13k | |||
| Dipsacus fullonum | teasel, common | 20k | 22k | 42k | |||
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