| Plant tribes (Ca - Ca) | 
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| fanwort, fishgrass |  | Hydropeltidales > Cabombaceae > Cabomboideae |  | 
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|  |  | Cactineae > Cactaceae > Cactoideae |  | 
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| cadaba |  | Capparales > Capparineae > Capparaceae |  | 
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|  |  | Fabanae > Fabales > Caesalpiniaceae |  | 
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| Hawai'i pearls, bird-of-paradise shrub, brazilwood, bukkum-wood, divi divi, holdback, mato, nicker, pride of Barbados, sappanwood, shoofly, uhiuhi, wait-a-bit vine |  | Fabales > Caesalpiniaceae > Caesalpinioideae |  | 
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| searocket |  | Capparineae > Brassicaceae > Cakileoideae |  | 
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| caladium, heart of Jesus |  | Aranae > Arales > Araceae |  | 
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| bluejoint, pinegrass, reed grass, reedgrass |  | Juncanae > Poales > Poaceae |  | 
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| calamus, rattan |  | Arecales > Arecaceae > Calamoideae |  | 
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| redmaids |  | Caryophyllales > Portulacineae > Portulacaceae |  | 
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|  |  | Violales > Flacourtiineae > Flacourtiaceae |  | 
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|  |  | Lamiales > Scrophulariaceae > Calceolarioideae |  | 
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|  |  | Agavales > Calectasiaceae > Calectasioideae |  | 
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| calendula, marigold |  | Asterales > Asteraceae > Calenduloideae |  | 
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| ballmustard |  | Capparales > Capparineae > Brassicaceae |  | 
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|  |  | Euphorbiales > Euphorbiaceae > Caletioideae |  | 
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| callalily, water arum, wild calla |  | Arales > Araceae > Calloideae |  | 
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| Japanese callicarpa, beautyberry, caparosa |  | Lamiales > Lamiineae > Lamiaceae |  | 
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|  |  | Polygonanae > Polygonales > Polygonaceae |  | 
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| water-starwort |  | Lamiales > Callitrichaceae > Callitrichoideae |  | 
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| heather |  | Ericales > Ericineae > Ericaceae |  | 
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| Alexandrian laurel, calophyllum |  | Theales > Clusiaceae > Calophylloideae |  | 
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| cowslip, marsh marigold |  | Ranunculineae > Ranunculaceae > Calthoideae |  | 
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| Bartram's ixia, violet lily |  | Iridales > Iridineae > Iridaceae |  | 
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| false flax, gold-of-pleasure |  | Capparineae > Brassicaceae > Camelinoideae |  | 
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| camellia, tea |  | Theineae > Theaceae > Camellioideae |  | 
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| Canterbury bells, Carpathian harebell, Dane's blood, bellflower, bluebell |  | Campanulineae > Campanulaceae > Campanuloideae |  | 
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|  |  | Caryophyllales > Chenopodiaceae > Camphorosmoideae |  | 
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|  |  | Lamianae > Lamiales > Orobanchaceae |  | 
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|  |  | Campanulales > Campanulineae > Campanulaceae |  | 
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| wild cinnamon |  | Canellales > Canellaceae > Canelloideae |  | 
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| hemp, marijuana |  | Urticales > Cannabaceae > Cannaboideae |  | 
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| Indian shot, bandanna of the Everglades, canna, canna lily, maraca amarilla, maraca montuna, maraca roja |  | Zingiberales > Cannaceae > Cannoideae |  | 
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| alahe'e, canthium |  | Rubiales > Rubiineae > Rubiaceae |  | 
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|  |  | Solanales > Polemoniineae > Polemoniaceae |  | 
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| caper, falseteeth, linguam |  | Capparineae > Capparaceae > Capparoideae |  | 
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|  |  | Dipsacales > Caprifoliaceae > Caprifolioideae |  | 
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| capsella, shepherd's purse |  | Capparales > Capparineae > Brassicaceae |  | 
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| aji, cayenne, chili, pepper, rocoto |  | Solanales > Solanineae > Solanaceae |  | 
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|  |  | Theanae > Theales > Clusiaceae |  | 
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|  |  | Gentiananae > Apocynales > Apocynaceae |  | 
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| carapa, crabwood |  | Rutanae > Rutales > Meliaceae |  | 
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| bittercress, crinkleroot, milkmaids, toothwort |  | Capparales > Capparineae > Brassicaceae |  | 
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| whitetop |  | Aralianae > Araliales > Apiaceae |  | 
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|  |  | Asteranae > Asterales > Asteraceae |  | 
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| thistle |  | Asterales > Asteraceae > Carduoideae |  | 
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| caraway, carum |  | Aralianae > Araliales > Apiaceae |  | 
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| carica, papaya, pawpaw |  | Caricales > Caricaceae > Caricoideae |  | 
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| amatungulu, carissa, karanda, natal plum |  | Apocynales > Apocynaceae > Carissoideae |  | 
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| carline thistle |  | Asterales > Asteraceae > Carlinoideae |  | 
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| Panama hat plant, carludovica |  | Cyclanthanae > Cyclanthales > Cyclanthaceae |  | 
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| hornbeam |  | Juglandanae > Corylales > Stylocerataceae |  | 
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|  |  | Saxifraganae > Cunoniales > Eucryphiaceae |  | 
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| safflower, saffron, thistle |  | Asteranae > Asterales > Asteraceae |  | 
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| achotillo, caryocar, pequi, souari nut |  | Theanae > Theales > Caryocaraceae |  | 
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|  |  | Caryophyllineae > Caryophyllaceae > Caryophylloideae |  | 
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|  |  | Lamiales > Verbenineae > Verbenaceae |  | 
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| palm |  | Arecanae > Arecales > Arecaceae |  | 
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| Guyanese wild coffee, casearia, crackopen, gia verde, wild honeytree |  | Violales > Flacourtiineae > Flacourtiaceae |  | 
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| apple blossom, avaram, cassia, partridge pea, senna, shower |  | Fabales > Caesalpiniaceae > Cassioideae |  | 
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| cassine |  | Celastrineae > Celastraceae > Cassinoideae |  | 
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| cassipourea, goatwood |  | Rhizophorales > Rhizophoraceae > Cassipoureoideae |  | 
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| cassytha, devil's gut |  | Laurales > Lauraceae > Cassythoideae |  | 
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| chestnut, chinkapin |  | Fagales > Fagaceae > Castaneoideae |  | 
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| castela, crucifixion thorn, goatbush |  | Rutales > Simaroubaceae > Casteloideae |  | 
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| Australian pine, beefwood, belah, sheoak |  | Casuarinales > Casuarinaceae > Casuarinoideae |  | 
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| Indian bean, candle tree, catalpa |  | Lamianae > Lamiales > Bignoniaceae |  | 
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|  |  | Asteranae > Asterales > Asteraceae |  | 
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|  |  | Orchidales > Orchidineae > Orchidaceae |  | 
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| lilythorn |  | Rubiineae > Rubiaceae > Catesbaeoideae |  | 
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| burr parsley |  | Araliales > Apiaceae > Caucalidoideae |  | 
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|  |  | Capparales > Resedineae > Resedaceae |  |