Epithets
| similis | similar |
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| simplex | simple |
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| simulans | imitating |
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| sinuata | wavy-edged |
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| sinuatus | wavy-edged |
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| sobolifera | having offshoots |
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| socialis | found in colonies |
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| somnifera | sleep inducing |
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| spathulata | with small spathe |
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| spathulatus | with small spathe |
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| 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 |