Epithets
| cuspidata | with stiff point |
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| cuspidatus | with stiff point |
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| cyanascens | bluish |
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| cyanum | blue |
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| cyanus | blue |
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| cymbi- | prefix meaning "boat-shaped" |
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| dactyloides | finger like |
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| dasy | prefix meaning "hairy" |
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| dealbata | whitened |
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| dealbatus | whitened |
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| decorus | beautiful |
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| decumbens | stems lying down |
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| decussata | crossed like the letter X |
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| decussatus | crossed like the letter X |
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| deltoides | like Greek letter Delta; triangular |
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| dens-canis | dog's tooth |
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| diandra | two stamens |
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| diandrus | two stamens |
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| dicarpum | two seeds |
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| dicarpus | two seeds |
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| dichotoma | dividing into pairs |
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| dichotomus | dividing into pairs |
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| didyma | in pairs |
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| didymus | in pairs |
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| diffusa | spreading |