Complete list of species
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| scientific name | common name(s) | image gallery |
| Suaeda suffrutescens var. suffrutescens | Desert Seepweed | |
| Suaeda tampicensis | Coastal Seepweed Tampico Sea-blite Tampico Seablite | |
| Suaeda taxifolia | Needle-leaf Seepweed Woolly Sea-blite Woolly Seablite | |
| Subularia aquatica | Water Awlwort | |
| Subularia aquatica var. americana | American Water-awlwort | |
| Suckleya suckleyana | Poison Suckleya | |
| Suksdorfia ranunculifolia | Buttercup Suksdorfia Buttercup-leaf Suksdorfia | |
| Suksdorfia violacea | Violet Suksdorfia | |
| Sullivantia hapemanii | Hapeman's Coolwort Wyoming Sullivantia | |
| Sullivantia hapemanii var. hapemanii | Hapeman's Coolwort Wyoming Sullivantia | |
| Sullivantia hapemanii var. purpusii | Purpus' Coolwort Purpus' Sullivantia | |
| Sullivantia oregana | Oregon Coolwort Oregon Sullivantia | |
| Sullivantia sullivantii | Sullivant's Coolwort Reniform Sullivantia | |
| Suriana maritima | Bay Cedar Bay-cedar | |
| Swallenia alexandrae | Eureka Dune Grass Eureka Dunegrass Eureka Valley Dune Grass Eureka-valley Dunegrass | |
| Swertia perennis | Felwort Star Gentian | |
| Swietenia mahagoni | West Indian Mahogany | |
| Symphoricarpos acutus | Creeping Snowberry Sharpleaf Snowberry Trailing Snowberry | |
| Symphoricarpos albus | Common Snowberry | |
| Symphoricarpos albus var. albus | Common Snowberry | |
| Symphoricarpos albus var. laevigatus | Common Snowberry Upright Snowberry | |
| Symphoricarpos guadalupensis | Mckittrick's Snowberry | |
| Symphoricarpos hesperius | Creeping Snowberry Trailing Snowberry | |
| Symphoricarpos longiflorus | Desert Snowberry Long-flower Snowberry Fragrant Snowberry | |
| Symphoricarpos microphyllus | Pink Snowberry | |
| Symphoricarpos mollis | Creeping Snowberry | |
| Symphoricarpos occidentalis | Western Snowberry Wolfberry | |
| Symphoricarpos orbiculatus | Coralberry Indian Currant Buckbrush | |
| Symphoricarpos oreophilus | Mountain Snowberry | |
| Symphoricarpos oreophilus var. oreophilus | Mountain Snowberry | |
| Symphoricarpos oreophilus var. utahensis | Mountain Snowberry Utah Snowberry | |
| Symphoricarpos palmeri | Palmer's Snowberry | |
| Symphoricarpos rotundifolius | Roundleaf Snowberry | |
| Symphoricarpos rotundifolius var. parishii | Mountain Snowberry Parish's Snowberry | |
| Symphoricarpos rotundifolius var. rotundifolius | Long Flowered Snowberry Mountain Snowberry Roundleaf Snowberry Roundleaved Snowberry | |
| Symphyotrichum adnatum | Scale-leaf Aster | |
| Symphyotrichum anomalum | Manyray Aster | |
| Symphyotrichum anticostense | Anticosti Island Aster | |
| Symphyotrichum ascendens | Western Aster Western American-aster Purple Aster Pacific Aster | |
| Symphyotrichum bahamense | Bahaman Aster | |
| Symphyotrichum boreale | Northern Bog Aster | |
| Symphyotrichum bracei | Brace's Aster | |
| Symphyotrichum campestre | Western Meadow Aster | |
| Symphyotrichum campestre var. bloomeri | Bloomer's Aster | |
| Symphyotrichum campestre var. campestre | Western Meadow Aster | |
| Symphyotrichum chilense | Pacific Aster Common California Aster | |
| Symphyotrichum chilense var. chilense | Pacific Aster | |
| Symphyotrichum chilense var. invenustum | Common California Aster Pacific Aster | |
| Symphyotrichum chilense var. medium | Common California Aster Pacific Aster | |
| Symphyotrichum ciliatum | Rayless Alkali Aster Alkali American-aster Rayless Aster | |
| scientific name | common name(s) | image gallery |
