Complete list of species
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| scientific name | common name(s) | image gallery |
| Carex scirpoidea | Northern Singlespike Sedge | |
| Carex scirpoidea ssp. convoluta | Northern Singlespike Sedge | |
| Carex scirpoidea ssp. pseudoscirpoidea | Single Spiked Sedge Western Singlespike Sedge | |
| Carex scirpoidea ssp. scirpoidea | Northern Singlespike Sedge | |
| Carex scirpoidea ssp. stenochlaena | Northern Singlespike Sedge | |
| Carex scoparia | Broom Sedge | |
| Carex scoparia var. scoparia | Broom Sedge | |
| Carex scoparia var. tessellata | Broom Sedge | |
| Carex scopulorum | Holm's Rocky Mountain Sedge Mountain Sedge | |
| Carex scopulorum var. bracteosa | Bracted Sedge Crater Sedge Mountain Sedge | |
| Carex scopulorum var. prionophylla | Firethread Sedge | |
| Carex scopulorum var. scopulorum | Mountain Sedge Rocky Mountain Sedge | |
| Carex senta | Rough Sedge Swamp Carex Swamp Sedge Western Rough Sedge | |
| Carex seorsa | Weak Stellate Sedge | |
| Carex serpenticola | Serpentine Sedge | |
| Carex serratodens | Bifid Sedge False Flax Saw-tooth Sedge Twotooth Sedge | |
| Carex sheldonii | Sheldon's Sedge | |
| Carex shinnersii | Shinner's Sedge | |
| Carex shortiana | Short's Sedge | |
| Carex siccata | Dryspike Sedge | |
| Carex silicea | Beach Sedge | |
| Carex simulata | Analogue Sedge Short Beaked Sedge Shortbeak Sedge | |
| Carex socialis | Low Woodland Sedge | |
| Carex sparganioides | Bur-reed Sedge | |
| Carex specicola | Navajo Sedge | |
| Carex specifica | Narrow Fruit Sedge Narrow-fruit Sedge Narrowfruit Sedge | |
| Carex spectabilis | Northwestern Showy Sedge Showy Sedge | |
| Carex spissa | San Diego Sedge | |
| Carex sprengelii | Sprengel's Sedge | |
| Carex squarrosa | Squarrose Sedge Narrowleaf Cattail Sedge | |
| Carex stenoptila | River-bank Sedge Riverbank Sedge | |
| Carex sterilis | Dioecious Sedge | |
| Carex stipata | Awlfruit Sedge Awl-fruited Sedge Stalk-grain Sedge | |
| Carex stipata var. maxima | Stalk-grain Sedge Stalkgrain Sedge | |
| Carex stipata var. stipata | Awlfruit Sedge | |
| Carex straminea | Eastern Straw Sedge | |
| Carex straminiformis | Mt. Shasta Sedge Shasta Sedge Straw Like Sedge | |
| Carex striata | Walter's Sedge | |
| Carex striata var. brevis | Walter's Sedge | |
| Carex striata var. striata | Walter's Sedge | |
| Carex striatula | Lined Sedge | |
| Carex stricta | Upright Sedge Uptight Sedge Tussock Sedge | |
| Carex styloflexa | Bent Sedge | |
| Carex stylosa | Long-style Sedge Variegated Sedge | |
| Carex subbracteata | Small Bract Sedge Small-bract Sedge Smallbract Sedge | |
| Carex suberecta | Prairie Straw Sedge | |
| Carex subfusca | Brown Sedge Rusty Sedge Rusty Slender Sedge | |
| Carex subnigricans | Blackish Sedge Dark Mountain Sedge Nearlyblack Sedge | |
| Carex subspathacea | Hoppner's Sedge | |
| Carex superata | Willdenow's Sedge Limestone Forest Sedge | |
| scientific name | common name(s) | image gallery |
