It seems like you're asking about plants that grow on other plants, specifically on their leaves. This is known as epiphytism, and the plants that do this are called epiphytes.

Here's a breakdown:

* Epiphytes: These are plants that grow on other plants, often trees, for support but don't take nutrients from their host. They get their nutrients and water from the air, rain, and organic matter that collects around them.

Here are some examples of common epiphytic plants:

* Orchids: Many orchids are epiphytes, using their aerial roots to cling to branches and absorb moisture from the air.

* Bromeliads: These plants are known for their colorful, vase-like leaves that collect water. Some bromeliads, like the popular "air plant" Tillandsia, can grow completely without soil.

* Mosses and Lichens: These simple organisms often grow on tree trunks and branches, forming intricate patterns.

* Ferns: Some ferns are epiphytes, especially in tropical rainforests.

Important Note: While these plants grow on leaves, they don't grow in leaves. They are simply using the leaves as a platform to access sunlight and moisture.

Let me know if you have more questions about epiphytes or other types of plants!