The tundra biome is characterized by its extremely cold temperatures and short growing season, making it difficult for most trees to survive. Because of this, you won't find large forests in the tundra. However, there are a few types of trees that can adapt to the harsh conditions:

1. Dwarf Trees: These trees are small, usually less than 1 meter tall, and have a stunted growth habit. They include:

* Dwarf birch (Betula nana): This species is a low-growing shrub with small, rounded leaves.

* Dwarf willow (Salix herbacea): This species is another low-growing shrub with tiny, oval-shaped leaves.

* Arctic willow (Salix arctica): This species can grow up to 1 meter tall and has small, round leaves that are covered in hairs to protect them from the cold.

2. Other Adaptable Trees:

* Larch (Larix laricina): This is a coniferous tree that can tolerate the cold temperatures of the tundra. They are deciduous, losing their needles in the winter, which helps them survive the harsh conditions.

* Black Spruce (Picea mariana): This coniferous tree is also well-adapted to cold climates. They have a conical shape and short, sharp needles.

It is important to note that these trees are typically found at the edges of the tundra or in areas with slightly more favorable conditions, such as river valleys or sheltered slopes. They are not as abundant or widespread as the trees found in other biomes.