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| Title | Chemical Count | Activity Count |
|---|---|---|
| Castanopsis concinna | 1 | 1 |
| Castanopsis eyrei | 1 | 1 |
| Castanopsis lamontii | 1 | 1 |
| Castanospermum australe | 3 | 4 |
| Catalpa bignonioides | 7 | 13 |
| Catalpa longissima | 3 | 5 |
| Catalpa ovata | 14 | 12 |
| Catha edulis | 12 | 13 |
| Catharanthus lanceus | 3 | 3 |
| Catharanthus roseus | 16 | 16 |
| Caulophyllum thalictroides | 25 | 17 |
| Ceanothus americanus | 2 | 2 |
| Ceanothus velutinus | 1 | 2 |
| Cedrus deodora | 4 | 11 |
| Cedrus libani | 1 | 1 |
| Ceiba pentandra | 14 | 16 |
| Celosia cristata | 7 | 9 |
| Cenchrus biflorus | 2 | 4 |
| Centaurea calcitrapa | 14 | 19 |
| Centaurea cyanus | 27 | 18 |