Many plants will develop roots on the petioles of leaves not not stem tissue. You need to take stem cuttings for that to occur.

I remember one guy who carefully rooted a large rubber plant leaf. It sure did grow some great roots, but never a single bit of stem! Hilarious.

Thank you for the reply. I have to laugh, then, I'm in with the rubber plant guy, I guess. Well, they look nice in my container garden for now, when they go roots up, I'll pull them. These did definitly form roots ant the very ends of the leaf stems where they snapped off the plant stem. Strange.
Garden Tink

There are plants you can start with a leaf, african violet, gloxinia, started right in the dirt. jade leaf layed on dirt, will develop into a plant.

I am having trouble rooting my pothos cuttings. I have successfully rooted fiddle leaf figs, rubber plants and dracaena marginadas but my pothos cuttings just rot. I put them in a south facing window because that's what's always worked for the rest. Is it possible that I need to let the cuttings dry for a couple hours before I put them in water? Am I not cutting them in the right place? Any help would be greatly appreciated!