I'm located in Mumbai, India. A few of these weird things started growing in a pot. I though it was quite interesting, since it has no leaves. Is it a type of grass? I have bunched and planted four of them together in this pot. Each stem at the soil level is a single separate plant. The stem continues in the soil as a single long deep root with limited branching. I would greatly appreciate it if someone could help me identify it.
What you have there is a whisk fern. Psilotum nudum. A very very ancient plant, somewhat similar to Equisetum. However, horsetail does not branch and has a pointy cone on top of each long pencil thin bamboo-like segmented stalk. These things, whisk fern, are living fossils, and once established are easy to care for. They spread by spores and will never develop leaves. They do not like to be transplanted and dislike too-wet soil. The tiny spores float all over the world and these things can show up anywhere. Its a cool little specimen and should last for years, enjoy!