| | Species | Habit | Malayalam | English |
| Abelmoschus rugosus | Herb | | |
| Abroma augusta | Shrub to Small Tree | | Devil's cotton |
| Acalypha amentacea ssp. wilkesiana | Shrub | | Beefsteak Plant, Fire Dragon Acalypha |
| Acalypha hispida | Shrub | Poochavalan, Vattapoonthaliyari | Cat's tail, Chenille plant, Red-hot cat's tail, Foxtail, Red Hot Poker |
| Adansonia digitata | Tree | | Babob tree, African Baobab tree |
| Adenanthera pavonina | Tree | Manchadai, Maniadi, Manjati | Circassian tree, Coral wood, Red bead tree, Red wood |
| Adenium obesum | Shrub | Desert Rose | Desert Rose, Impala Lily |
| Adenocalymna alliaceum | Climber | Vellullichedi | Garlic plant |
| Agapanthus africanus | Herb | | African lily |
| Agave salmiana var. ferox | Shrub | | |
| Ageratum houstonianum | Herb | Kaliyamman-pathiri, Michangala, Neela appa, Floss Flower | Flossflower |
| Albizia saman | Tree | Mazhamaram, Urakamthoongimaram | Cow tamarind, Monkeypod, Rain tree |
| Alcea rosea | Herb | | |
| Allamanda blanchetii | Climber | | Cherry allamanda, Purple Allamanda |
| Allamanda cathartica | Climber | Manjakolambi, Kolaambi | Golden trumpet, Common allamanda |
| Alocasia macrorrhiza | Herb | Aanachembu, Aassamchembu, Chembu, Eezhachembu, Marenchembu, Pazhchembu | |
| Alstroemeria aurea | Herb | | Peruvian lily |
| Amherstia nobilis | Tree | Simshipa-vriksham | Pride of Burma, Orchid Tree |
| Ananas bracteatus | Herb | | Wild Pineapple |
| Angelonia salicariaefolia | Herb | Aamappoovu | |
| Antigonon leptopus | Climber | Thenpoovalli | Coral Creeper, Coral Vine, Corallita, Mexican Coral Vine, Mexican creeper, Pink Vine, Sandwich Island Creeper |
| Arachis glabrata | Herb | | Hagenbeck's Peanut |
| Arachis pintoi | Herb | | Forage Peanut |
| Araucaria heterophylla | Tree | | |
| Areca triandra | Tree | | |
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