The concept behind these old hybrids was similar to the modern Grex Registry: when a hybrid was made, the batch would be given a Latin name. If the hybrid was re-made, the batch would be given a new Latin name. The rules then changed, and nearly all these names became synonyms.


Most of these hybrids are thought to be extinct (when they are extant, they are often found in botanic gardens, thanks to institution exchanges dating back to the 1800s), so I can't guarantee that all these photos represent the real thing. In fact, I see a few possible problems. Let's take williamsii as an example:
- Maybe someone labelled another hybrid as williamsii by mistake.
- Maybe someone knew that williamsii is hookeriana x sedenii, that sedenii is gracilis x khasiana, he re-made the hybrid hookeriana x gracilis x khasiana, he labelled it williamsii, but one day we find out that sedenii was gracilis x mirabilis.
- Maybe someone knew that williamsii is hookeriana x sedenii, that sedenii is gracilis x khasiana, he re-made the hybrid hookeriana x gracilis x khasiana, he labelled it williamsii, and even if one day we find out that sedenii was gracilis x khasiana, this new batch can't be considered williamsii, because that name - apart from being now just a synonym - only applies to the batch from the 1800s.

henryana (Taplin) hookeriana x sedenii Photo: Nora Goosen	henryana (Taplin) hookeriana x sedenii	outramiana (Taplin) hookeriana x sedenii Photo: ellisonk001

superba (Taplin, 1880) hookeriana x sedenii Photo: HeliamphoraWalnut	superba (Taplin, 1880) hookeriana x sedenii	williamsii (Taplin) hookeriana x sedenii Photo: pitcherplant.com

Nepenthes hybrids and cultivars reduced to lowest terms
Published online (2022).

Nepenthes hybrids marketed by Marcel Lecoufle
Published online (2022).

Complex Nepenthes hybrids with valid names
Published online (2022).

Sarracenia hybrids and cultivars reduced to lowest terms
Published online (2023).