Epithets
| frondosus | leafy |
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| frutescens | becoming shrubby |
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| fruticosa | shrubby |
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| fruticosus | shrubby |
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| fulgens | shining |
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| fulva | tawny |
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| fulvus | tawny |
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| fungosa | spongy |
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| fungosus | spongy |
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| furcata | cleft |
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| fusca | dark |
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| fuscus | dark |
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| garganica | of Monte Gargano, Italy |
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| garganicus | of Monte Gargano, Italy |
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| gibbosa | humped |
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| gibbosus | humped |
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| gibbus | humped |
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| glabella | nearly glabrous |
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| glabellus | nearly glabrous |
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| glaber | smooth, hairless, bald |
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| glabra | smooth, hairless, bald |
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| glabrescens | becoming glabrous |
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| glabrous | smooth, hairless, bald |
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| glandulifer | bearing little glands |
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| glandulifera | bearing little glands |