TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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I don't know if you are still looking for a female plant to cross with your Nepenthes x mastersiana, but I have a female N. singala x ventricosa that will be blooming in a few weeks. It has a finely toothed peristome that I think would complement the lightly striped peristome of your N. x mastersiana. The pictures are the buds, lower pitcher (on a cutting), intermediate pitcher, and upper pitcher.