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Systematics of the tribe orcuttieae gramineae and the description of tuctoria new genus


, : Systematics of the tribe orcuttieae gramineae and the description of tuctoria new genus. American Journal of Botany 69(7): 1082-1095

The 2 genera Neostapfia and Orcuttia, recognized as being closely allied and sharing unusual features, are treated as the sole members of the tribe Orcuttieae. Neostapfia is monotypic; Orcuttia comprises 8 taxa, 6 of which are universally treated as species and 2 as varieties. Studies were based on field work throughout the ranges of these 2 genera and examination of 550 herbarium specimens. Chromosome counts and seed protein analyses for all taxa are presented. Each taxon is worthy of specific status and Orcuttia, as traditionally treated, consists of discordant elements. A more satisfactory taxonomy results when this group is split into 2 genera. A new genus, TUCTORIA, is described and the combinations T. fragilis (Swallen) J. Reeder [basionym: O. fragilis], T. greenei (Vasey) J. Reeder [basionym: O. greenei], and T. mucronata (Crampton) J. Reeder [basionym: O. mucronata] are proposed.

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