S - Scientific names starting on S
| Sagina cespitosa | Stuttarve | R | No picture yet | No picture yet | |
| Sagina nivalis | Jøkelarve | Snow Pearlwort |  |
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| Salix herbacea | Musøre | Dwarf Willow |  |
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| Salix lanata var. lanata | Ullvier | Woolly Willow | R |  |
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| Salix polaris | Polarvier |  |
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| Salix reticulata | Rynkevier | Net-leaved Willow |  |
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| Saussurea alpina | Fjelltistel | Alpine Saw-wort | R |  |
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| Saxifraga aizoides | Gulsildre | Yellow Saxifrage |  |
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| Saxifraga cernua | Knoppsildre | Drooping Saxifrage |  |
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| Saxifraga cespitosa ssp. cespitosa | Tuesildre | Tufted Saxifrage |  |
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| Saxifraga hirculus | Myrsildre | Marsh Saxifrage |  |
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| Saxifraga hyperborea | Polarsildre | Polar Saxifrage |  |
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| Saxifraga oppositifolia ssp. oppositifolia | Rødsildre | Purple Saxifrage |  |
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| Saxifraga platysepala | Trådsildre |  |
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| Saxifraga rivularis ssp. rivularis | Bekkesildre |  |
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| Saxifraga svalbardensis | Svalbardsildre |  |
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| Sibbaldia procumbens | Trefingerurt | Sibbaldia | R |  |
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| Silene acaulis | Fjellsmelle | Moss Campion |  |
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| Silene involucrata ssp. furcata | Polarjonsokblom | Artic White Campion |  |
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| Silene uralensis ssp. arctica | Blindurt | Polar Campion |  |
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| Stellaria humifusa | Ishavsstjerneblom |  |
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| Stellaria longipes | Snøstjerneblom |  |
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