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Title: Local, regional and monographic approaches to Cyrtandra (Gesneriaceae)
Author: Bramley, Gemma L. C.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2003
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A local revision reviewed collections of Cyrtandra from Mount Kerinci, Sumatra, recognising thirteen species, three of which are newly described: C. aureotincta, C. patentiserrata, and C. stenoptera. In a regional approach covering species from Peninsular Malaysia, nine species of Cyrtandra (Gesneriaceae) were recognised. Three [C. cupulata, C. pendula, C. wallichii] are common and occur more or less throughout the area; four [C. dispar, C. gimlettei, C. patula, C. suffruticosa] have more restricted distributions, and two [C. lanceolata, C. stonei] are local endemics. Three species and one variety are reduced to synonymy: C. barbata (= C. cupulata), C. falcata (= C suffruticosa), C. rotundifolia (= C. pendula), and C. cupulata var. minor (= C. cupulata). A phylogenetic approach involved a monographic revision of Cyrtandra section Dissimiles. Eleven species were reviewed, one of which is newly described (C. fulvisericea); one species, C. producta (= C. trisepala) is reduced to synonymy. Phylogenetic analyses of sequences of the internal transcribed spacer (ITS) region of 18-26S nuclear ribosomal DNA of Cyrtandra species from one community on Mount Kerinci, Sumatra, suggest that this community is an assembly of three distinct phyletic lineages, resulting from a gradual accumulation of diversity through time, although one lineage shows evidence of more recent, continuing speciation than the other two. Phylogenetic analyses of a second, larger sample of Cyrtandra ITS sequences suggest that Peninsular Malaysian Cyrtandra species have affinities with Sumatran and Bornean species, following previously recognised floristic patterns. These affinities can be explained historically, as periods of lower sea levels of the Pleistocene exposed land bridges between the Malay Peninsula, Sumatra and Borneo. A smaller sample of Cyrtandra species was sequenced for the trnL-F region of the choroplast gene, and phylogenetic analyses recognised major groups represented in the ITS phylogeny, suggesting congruence between the ITS and trnL-F data, and that the ITS phylogeny is an approximation of true evolutionary history.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available