A phylogenetic analysis of Laeliinae (Orchidaceae) based on sequence data from internal...

Nuclear ribosomal ITS1 and ITS2 DNA sequences were used in a phylogenetic analysis for 295 accessions representing most genera of subtribe Laeliinae (Orchidaceae), as well as select members of Pleurothallidinae, Coeliinae, Meiracylliinae, Bletiinae, and other potential outgroups from Epidendroideae. The level of ITS variation was low, and most of the clades have low bootstrap support. Despite the large number of trees found (>10 000), the groups identified correspond in part to previous taxonomic groups, at both the generic and infrageneric levels, and also correlate with geographic distribution. Arpophyllum was identified as sister to the rest of Laeliinae, and Meiracyllium (Meiracylliinae) was embedded in a position close to Euchile, rather than in a distinct subtribe. On the other hand, Ponera, Isochilus and Helleriella would best be classified in a distinct subtribe (Ponerinae), and Dilomilis and Neocogniauxia are sister to Pleurothallidinae. Cattleya, Encyclia, Epidendrum and Laelia are clearly polyphyletic.

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Lindleyana. – 2000. – Vol. 15, № 2. – P. 96–114.