Nolina plants, also known as bear grass or ponytail palms, are perennial plants with unique features. They can grow as tufts of leaves or develop a woody trunk, resembling a small tree. These plants are native to North America and Mexico, and they are known for their easy care and ability to store water in their bulbous trunks. 

Here's a more detailed description:

Appearance:

Trunk:

Many Nolina species develop a thick, woody trunk that can store water, giving them a distinctive appearance. 

Leaves:

They have long, linear leaves that grow in rosettes, often with narrow, serrated edges. 

Flowers:

The flowers are typically small, white, and arranged in branched inflorescences, which can grow quite tall. 

Growth Habits:

Slow-growing:

Nolina plants are generally slow-growing, making them a good choice for those who prefer low-maintenance houseplants. 

Drought-tolerant:

Their ability to store water in their trunks allows them to tolerate dry conditions. 

Colonies:

Some species form colonies, with multiple rosettes growing from a single root system. 

Examples:

Nolina recurvata (Ponytail Palm): A popular houseplant known for its bulbous trunk and ponytail-like leaves. 

Nolina beldingii (Cape Nolina): A larger species with a woody trunk and leaves that were traditionally used by Native Americans for thatching, according to Wikipedia. 

Nolina microcarpa (Beargrass): A smaller species that grows in clumps and has narrow, grass-like leaves, according to Wikipedia. 

Other Notable Features:

Air purification:

Some Nolina species are known to help purify the air, making them a beneficial addition to indoor spaces. 

Low maintenance:

They are relatively easy to care for, needing bright, indirect light and infrequent watering.