Epithets
| tortuosa | twisted |
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| tortuosum | twisted |
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| torus | twisted |
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| trachelia | neck-like |
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| trachelius | neck-like |
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| triangularis | triangular |
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| triangulatus | triangular |
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| tricho- | prefix meaning "hairy" |
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| triste | dull, sad |
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| tristis | dull, sad |
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| triternata | three times divided into three |
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| triternatus | three times divided into three |
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| tuberculata | with tubercles, bumps |
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| tuberculifera | with tubercles, bumps |
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| tuberculosa | with tubercles, bumps |