| Species | Habit | Malayalam | English |
| Abelmoschus crinitus | Herb | | |
| Abelmoschus esculentus | Herb | Venda | Gumbo, Lady's finger, Okra |
| Abelmoschus manihot | Herb | | |
| Abelmoschus rugosus | Herb | | |
| Acalypha brachystachya | Herb | | |
| Acalypha indica | Herb | Kuppameni | Indian acalypha |
| Acalypha lanceolata | Herb | | |
| Acalypha malabarica | Herb | | |
| Acalypha paniculata | Herb | Valia-kuppameni | |
| Acampe ochracea | Herb | | |
| Acampe praemorsa | Herb | Maravazha, Taliyamaravada, Upputhali | |
| Acampe rigida | Herb | | |
| Acanthephippium bicolor | Herb | | |
| Acanthospermum hispidum | Herb | Njeringil, Musumusu | |
| Achillea millefolium | Herb | | |
| Achyranthes aspera var. aspera | Herb | Kadaladi, Vankadaladi, Valiyakadaladi | Prickly chaff flower, Rough chaff |
| Achyranthes aspera var. porphyristachya | Herb | | |
| Achyranthes aspera var. pubescens | Herb | | |
| Achyranthes bidentata | Herb | Cherukadaladi, Nayaruvichedi | |
| Acmella calva | Herb | Akravu, Eripacha, Erivalli, Kaduparni, Kuppamanjal, Naikoppu, Naimanjal, Palluvedanachedi, Tharippuchedi | Paracress, Toothache plant |
| Acmella paniculata | Herb | | |
| Acmella uliginosa | Herb | | |
| Acorus calamus | Herb | Vayambu, Vashanpa | Sweet flag, Sweet root |
| Acranthera anamallica | Herb | | |
| Acranthera grandiflora | Herb | | |
| Acroceras munroanum | Herb | | |
| Acrotrema arnottianum | Herb | Nilampunna | |
| Actinoscirpus grossus | Herb | | |
| Adenoon indicum | Herb | | |
| Adenosma indiana | Herb | Kasithumba | |
| Adenosma malabaricum | Herb | | |
| Adenosma subrepens | Herb | | |
| Adenostemma lavenia var. angustifolia | Herb | Sticky Daisy | |
| Adenostemma lavenia var. lavenia | Herb | | |
| Adenostemma macrophylla | Herb | | |
| Aeginetia indica | Herb | Keerippovu | Forest Ghost Flower |
| Aeginetia pedunculata | Herb | Yellow Ghost Flower | |
| Aeluropus lagopoides | Herb | | |
| Aenhenrya rotundifolia | Herb | | |
| Aerides crispa | Herb | | |
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