| Species | Habit | Malayalam | English |
| Abelmoschus moschatus | Shrub | Kattukasthuri, Kasthurivenda, Lathakasthuri | Ambrette plant, Musk mellow, Muskseed |
| Abrus precatorius | Climber | Chuvannakunni, Kakani, Kunni, Kunnikuru, Gunj | Bead Vine, Black-Eyed Susan, Buddhist Rosary Bead, Crab's eye, Indian liquorice, Rosary pea, Wild liquorice |
| Abrus pulchellus | Climber | Valiya kattumuthira | |
| Abutilon hirtum | Shrub | Oorakam | |
| Abutilon indicum var. indicum | Shrub | Kaluram, Kattooram, Oorpam, Ooram, Thuthi, Velluram, Vennkurunthotti, Indian Mallow | Country mallow, Indian mallow |
| Acacia caesia | Climber | Eenga, Eenja, Incha, Palinja, Velutha-incha | Soap bark |
| Acacia catechu | Tree | Karingali, Kadiram, Cutch tree | Black catechu, Cutch tree, White kutch |
| Acacia leucophloea | Tree | Chenkaringali, Vellavelam, Velvelakam, Velvelam, Pattacharayamaram | Distiller's acacia, White babul, White barked acacia |
| Acacia nilotica ssp. indica | Tree | Karivelum, Karuvelakam, Babool | Babul tree, Black babool, Indian gum arabic tree |
| Acacia sinuata | Climber | Charmalentha, Charmanthala, Cheeka, Cheekkakka, Cheenikka, Cheevikka, Perumkai, Shivakai | Ritha, Soapnut acacia |
| Acalypha fruticosa | Shrub | Balamunja, Chini, Kuppameni, Sinnimaram | Birch leaved acalypha |
| Acalypha indica | Herb | Kuppameni | Indian acalypha |
| Acalypha paniculata | Herb | Valia-kuppameni | |
| Acampe praemorsa | Herb | Maravazha, Taliyamaravada, Upputhali | |
| Acanthospermum hispidum | Herb | Njeringil, Musumusu | |
| Acanthus ilicifolius | Shrub | Chulli, Chullikandal, Chakkaramullu, Chakkaramulli, Mendli, Moranna, Muthalamookku, Payinjachulli | |
| Achyranthes aspera var. aspera | Herb | Kadaladi, Vankadaladi, Valiyakadaladi | Prickly chaff flower, Rough chaff |
| Achyranthes bidentata | Herb | Cherukadaladi, Nayaruvichedi | |
| Acmella calva | Herb | Akravu, Eripacha, Erivalli, Kaduparni, Kuppamanjal, Naikoppu, Naimanjal, Palluvedanachedi, Tharippuchedi | Paracress, Toothache plant |
| Acorus calamus | Herb | Vayambu, Vashanpa | Sweet flag, Sweet root |
| Acronychia pedunculata | Tree | Chakkimaram, Mavaranchi, Mavuringi, Muttanari, Orilatheeppettimaram, Verukutheeni, Vettukanala, Vidukanali | |
| Acrotrema arnottianum | Herb | Nilampunna | |
| Adenia hondala | Climber | Karimuthukku, Muthukku, Modekka, Thannikkeera | |
| Adenia wightiana | Climber | | |
| Adenocalymna alliaceum | Climber | Vellullichedi | Garlic plant |
| Aegle marmelos | Tree | Koolakam, Koovalam, Vilvam, Mavilavu | Bael tree, Bengal quince, Holy fruit tree, Indian Bael, Stone apple, Wood Apple |
| Aerva lanata | Herb | Cherula, Cherupula, Cheruvula, Peela, Pongalpoovu | Polpala |
| Aeschynomene indica | Herb | Nellithali, Nettithakkai, Thakkapundu | |
| Aganosma cymosa | Climber | Palavarikody | |
| Ageratina adenophora | Shrub | Neelagiri, Thravada | Sticky snakeroot, Crofton weed |
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