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| Cactaceae (1) | Caesalpinia clade (1) | CAMPANULACEAE (1) |
| Campanulidae (2) | campanulids (1) | Cantharellaceae (1) |
| Cape Cod (1) | Caprifoliaceae (3) | Carbon (1) |
| Carbon Dioxide (1) | Carbonic Anhydrases (1) | Caryophyllaceae (1) |
| Cattle (1) | Cell Line (1) | Cell Nucleus (1) |
| Centridini (1) | Cerro Cuadrado (1) | Chamaecyparis (1) |
| Character correlation (1) | character evolution (5) | Chloroplast (1) |
| chloroplast DNA (2) | chloroplast DNA introns (1) | chloroplast non-coding region (1) |
| Chloroplasts (2) | chromosome (1) | chronogram (1) |
| CLADISTIC analysis (2) | classification (5) | Clavariaceae (1) |
| Climate (3) | climate change (5) | CLIMATIC changes (1) |
| climatic niches (1) | Cloning (2) | Codon (1) |
| community phylogenetics (1) | comparative methods (2) | Computer Simulation (1) |
| Computers in biology (1) | Computers – Biological applications (1) | cone (1) |
| confidence (1) | conifer (1) | conifer phylogeny (1) |
| conifers (1) | CONSERVATION (1) | CONSERVATION biology (1) |
| Conservation of Natural Resources (2) | Contemporary evolution (1) | core eudicots (2) |
| Corner’s rules (1) | correlated evolution (1) | cpDNA (2) |
| Crete (1) | CRETE (Greece) (1) | Crosses (1) |
| crown clade (1) | CYBERINFRASTRUCTURE (1) | |