| Family | subfamily | Genus | Species | |
|---|---|---|---|---|
| Commelinaceae | Commelina L. | Commelina forsskaolii Vahl | Details | |
| Commelinaceae | Commelina L. | Commelina latifolia Hochst ex A.Rich. | Details | |
| Nyctaginaceae | Commicarpus Standl. | Commicarpus helenae (Roem. & Schult.) Meikle | Details | |
| Nyctaginaceae | Commicarpus Standl. | Commicarpus plumbagineus (Cav.) Standl. | Details | |
| Nyctaginaceae | Commicarpus Standl. | Commicarpus sinuatus Meikle | Details | |
| Burseraceae | Commiphora Jacq. | Commiphora gileadensis (L.) C.Chr. | Details | |
| Burseraceae | Commiphora Jacq. | Commiphora quadricincta Schweinf. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus arvensis L. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus althaeoides L. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus hystrix Vahl. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus pilosellifolius Desr. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus lanatus Vahl. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus glomeratus Choisy | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus prostratus Forssk. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus oleifolius Desr. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus rhyniospermus Choisy | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus siculus L. subsp. siculus | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus fatmensis Kunze | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus siculus L. subsp. elongatus (Willd.) Batt. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus schimperi Boiss. | Details | |
| Convolvulaceae | Convolvulus L. | Convolvulus lineatus L. | Details | |
| Convolvulaceae | Convolvulus L. | convolvulus stachydifolius Choisy var. villosus Hallier f. | Details | |
| Cucurbitaceae | Corallocarpus Welw. ex Hook.f. | Corallocarpus schimpera (Naudin) C. Jeffery | Details | |
| Lophiocarpaceae | Corbichonia Scop. | Corbichonia decumbens (Forssk.) Excell | Details | |
| Tiliaceae [ Family (APGIII): Malvaceae s.l. ] | Grewioideae | Corchorus L. | Corchorus olitorius L. | Details |
| Tiliaceae [ Family (APG III): Malvaceae s.l.) | Grewioideae | Corchorus L. | Corchorus tridens L. | Details |
| Tiliaceae [ Family (APGIII): Malvaceae s.l. ] | Grewioideae | Corchorus L. | Corchorus depressus (L.) Peterm. | Details |
| Tiliaceae [ Family (APG III): Malvaceae s.l.) | Grewioideae | Corchorus L. | Corchorus trilocularis L. | Details |
| Boraginaceae | Cordioideae | Cordia L. | Cordia sinensis Lam. | Details |
| Umbelliferae (Apiaceae) | Apioideae | Coriandrum L. | Coriandrum sativum L. | Details |
| Primulaceae | Coris L. | Coris monspeliensis L. | Details | |
| Amaranthaceae s.l. | Salsoloideae | Cornulaca Delile | Cornulaca monacantha Delile | Details |
| Leguminosae (Fabaceae) | Papilionoideae (Faboideae) | Coronilla L. | Coronilla scorpioides (L.) W.D.J.Koch | Details |
| Gramineae (Poaceae) | Pooideae | Corynophorus P.Beauv. | Corynephorus divaricatus (Pourr.)Breistr. | Details |
| Rosaceae | Amygdaloideae | Cotoneaster Medik. | Cotoneaster orbicularis Schltdl. | Details |
| Compositae (Asteraceae) | Asteroideae | Cotula L. | Cotula anthemoides L. | Details |
| Crassulaceae | Crassula L. | Crassula alata (Viv.) A. Berger | Details | |
| Crassulaceae | Crassula L. | Umbilicus rupestris (Salisb.) Dandy | Details | |
| Rosaceae | Amygdaloideae | Crategeus Ehrenb. ex L. | Crategus x sinaica Boiss. | Details |
| Rosaceae | Amygdaloideae | Crategeus L. | Crategus azoralus L. | Details |
| Compositae (Asteraceae) | Cichorioideae | Crepis L. | Crepis aculeata (DC.)Boiss. | Details |
| Compositae (Asteraceae) | Cichorioideae | Crepis L. | Crepis aspera L. | Details |
| Compositae (Asteraceae) | Cichorioideae | Crepis L. | Crepis sancta (L.) Bornm. | Details |
| Compositae (Asteraceae) | Cichorioideae | Crepis L. | Crepis senecioides Delile | Details |
| Compositae (Asteraceae) | Cichorioideae | Crepis L. | Crepis micrantha Czerep. | Details |
| Convolvulaceae | Cressa L. | Cressa cretica L. | Details | |
| Umbelliferae (Apiaceae) | Apioideae | Crithmum L. | Crithmum maritimum L. | Details |
| Gramineae (Poaceae) | Pooideae | Crithopsis Jaub. & Spach | Crithopsis delileana (Schult.) Roshev. | Details |
| Compositae (Asteraceae) | Carduoideae | Crocodilium Hill | Crocodilium pumilio (L.) N.Garcia & Susanna | Details |
| Leguminosae (Fabaceae) | Papilionoideae (Faboideae) | Crotalaria L. | Crotalaria microphylla Vahl | Details |