黄栀香 or 黄枝香
栀 is gardenia; 枝 is branch. The GI standard, the naming standard and the China Tea Science Society write 黄栀香. The grading standard's appendix writes 黄枝香 and glosses it 黄枝(栀). Both writings come from Chaozhou standards bodies, so neither is simply wrong; "yellow branch" is a literal reading of the second, while the sources agree the aroma is gardenia.