Epithets
| speciosa | showy |
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| speciosus | showy |
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| spectabile | notable, spectaclular |
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| spectabilis | notable, spectaclular |
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| spica | in spikes |
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| spicata | in spikes |
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| spinosa | spiny |
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| spiralis | spiraled |
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| splendens | shining, splendid,bright |
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| splendida | shining, splendid,bright |
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| spurium | false |
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| spurius | false |
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| squamata | scaly |
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| squamea | scaly |
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| squamigera | scaly |
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| squamosa | scaly |
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| stellaris | star-like |
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| stellata | star-like |
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| stellatus | star-like |
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| stelliformis | star-shaped, star-like |
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| stellulata | star-shaped, star-like |
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| stellulatus | star-shaped, star-like |
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| sten- | prefix meaning "narrow" |
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| straminea | straw colored |
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| stramineus | straw colored |