| Species | Habit | Malayalam | English |
| Abelmoschus crinitus | Herb | | |
| Abelmoschus esculentus | Herb | Venda | Gumbo, Lady's finger, Okra |
| Abelmoschus rugosus | Herb | | |
| Abroma augusta | Shrub to Small Tree | | Devil's cotton |
| Abutilon striatum | Shrub | | |
| Acacia catechu | Tree | Karingali, Kadiram, Cutch tree | Black catechu, Cutch tree, White kutch |
| Acacia dealbata | Tree | Wattle | Silver Wattle |
| Acacia farnesiana | Tree | | |
| Acacia mearnsii | Tree | | Black Wattle |
| Acacia mellifera | Shrub to Small Tree | | |
| Acacia nilotica ssp. indica | Tree | Karivelum, Karuvelakam, Babool | Babul tree, Black babool, Indian gum arabic tree |
| 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 |
| Acanthospermum hispidum | Herb | Njeringil, Musumusu | |
| Acanthus ebracteatus | Shrub | | |
| Acanthus montanus | Shrub | | |
| Achillea millefolium | Herb | | |
| Acmella calva | Herb | Akravu, Eripacha, Erivalli, Kaduparni, Kuppamanjal, Naikoppu, Naimanjal, Palluvedanachedi, Tharippuchedi | Paracress, Toothache plant |
| Acmella uliginosa | Herb | | |
| Acorus calamus | Herb | Vayambu, Vashanpa | Sweet flag, Sweet root |
| 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 |
| Aeschynomene americana | Herb | American Joint Vetch | |
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