To investigate gene diversity and expression pattern in Camellia Sect. Oleifera, 454 GS FLX platform and Titanium regent were used to produce expressed sequence tags (ESTs) from flower buds of 3 Camellia species. A total of 5 920 499 ESTs were generated. Clustering those sequences twice by Cap3 produced 15 733 contigs and 20 606 singlets in C. oleifera , 19 397 contigs and 26 882 singlets in C. chekiangoleosa , 14 779 contigs and 25 389 singlets in C. brevistyla . The GC gradients in 3 transcriptomes basically followed a normal distribution. In additional all contigs and singlets were functionally categorized into GO(Gene Ontology) categories respectively.
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