| Rope fibre plant | Rese wala bhindi | Hibiscus ovalifolius (Forak) Vahl. | Malvaceae | Kharif |  |
| Running grass, | Para grass | Brachiaris reptarns (L.) | Poaceae | Kharif |  |
| Sanwa | Sanwa | Echinochloa colonum (L.) Link Hort. | Poaceae | Kharif |  |
| Scarlet pimernel | Krishanil | Anagallis arvensis Linn. | Primulaceae | Rabi |  |
| Sensitve plant, Humble plant, touch me not | Lajwanti, Chuemui | Mimosa pudica Linn. | | Rabi | |
| Serpent milky weed | Ground dodhi | Euphorbia serpens L. | Euphorbiaceae | Kharif |  |
| Sessile joyweed | Kantevali santhi, phulani | Alternathera sessile (L.) R. Br. | Amaranthaceae | Kharif |  |
| Seven Golden Candlesticks | Bada Senna | Cassia alata (L.) | Leguminaceae | Perennial |  |
| Shoe-Flower | Jungali bhindi, Japapushpa | Hibiscus panduraeformis Burm | | Kharif | |
| Siam weed | Siam weeds | Chromolaena odorata Linn. | | Kharif | |
| Sickle sena, foetid cassia | Charota, Pammar | Cassia tora Linn. | Caesalpiniaceae | Kharif |  |
| Silk Leaf, Acuate, American softhead | Mkhamali patti | Lagascea mollis | | Kharif | |
| Silver Hairgrass | Chandi fool ghans | Aira charysophylla L | | Kharif |  |
| Slender dwarf morning glory | Shankpushpi | Evolvulus alsinoides L. | Convolvualceae | Kharif |  |
| Small canary grass | Genhu ka mama, Gulli-danda | Phalaris minor Retz. | Poaceae | Rabi |  |
| Small drop seed | Ornamental grass | Sporbolus glaucifolius Hochst. | Poaceae | Kharif |  |
| Small White Morning Glory | Praktvind | Ipomoea lacunose L. | Convolvualceae | Kharif |  |
| Small whorled Cheese mallow | | Malva parviflora Linn. | | Kharif | |
| Smooth crab grass | Bondrya | Digitaria adscendens (H.B & K.) Honr. | Poaceae | Kharif |  |
| Smooth Rattlepod, salts rattlebox, streaked rattlepod | Striped crotalaria | Crotalaria pallida Aiton Crotalaria mucronata, Crotalaria striata | | Kharif | |
| Spiny amaranthus | Katilichaulai | Amranthus spinosus Linn. | Amaranthaceae | Kharif |  |
| Spiny sowthistle | Didhi | Sonchrus asper (L.) Hill. | Asteraceae | Kharif |  |
| Spreading hogweed | Bikshafra, Shanti | Boerhavia diffusa Linn. | Nyctaginaceae | Rainy |  |
| Stink Grass | Blue bent grass | Eragrostis cilianensis | Poaceae | Kharif |  |
| Stone root, Richweed | Jhar tulsi buta | Collinsonia canadensis L. | Lamiaceae | Kharif |  |