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Welcome to the Tetragonostachys As most of the species of the subgenus Tetragonostachys of the genus Selaginella occur west of the Mississippi River. I have prepared PDF Fast Keys to the species found in specific Western USA states. Below you will find links to those PDF files listed by the name of the state. For states without a link I have summarized the species found within those unlinked states at the bottom of this page.
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Those states with few or one species only and the species that are
found within them are: Alaska: S. sibirica Idaho: S. densa, S. wallacei, S. watsonii Nevada: S. leucobryoides, S. utahensis, S. watsonii North Dakota: S. densa, S. rupestris Oklahoma: S. arenicola, S. peruviana, S. rupestris, S. underwoodii Oregon: S. densa, S. oregana, S. wallacei. S. watsonii South Dakota: S. densa, S. rupestris Washington: S. densa, S. oregana, S. wallacei
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