Complete Chloroplast Genomes of Saccharum giganteum , Saccharum longisetosum , Cleistachne sorghoides, Sarga timorense, Narenga porphyrocoma and Tripsacum dactyloides . Comparisons with ITS phylogeny and Placement within Saccharum

The first complete chloroplast and Internal Transcribed Sequence (ITS) cassette sequences for the species: Saccharum giganteum , Saccharum longisetosum , Cleistachne sorghoides, Saccharum narenga and Tripsacum dactyloides are presented. Corresponding sequences for a new isolate of Sarga timorense were assembled. Phylogenetic analyses place S. giganteum , S. longisetosum and S. narenga within the Saccharinae but distinct from Saccharum, whilst C. sorghoides emerges as a member of genus Sarga and Tripsacum datyloides as a member of the Tripsacinae. Comparison of chloroplast and ITS phylogenies reveal complex reticulate evolution within the Saccharinae, with S. giganteum , S. longisetosum and S. narenga , despite having the same base chromosome count (15) having different evolutionary origins; making them members of different genera and not members of genus Saccharum . The importance of reticulate evolution in the origins of Andropogoneae, particularly the Saccharinae and the unique positions of Saccharum and Miscanthus is discussed.