Dracaena is a genus of over 120 species of trees and succulent shrubs, known for their striking foliage and air-purifying qualities. They are popular as houseplants due to their attractive, often variegated leaves and relatively low maintenance requirements. Many Dracaena species are characterized by their sword-shaped leaves, which can be green, variegated with yellow or white, or even have reddish edges. Some species, like Dracaena fragrans, are commonly called "corn plants" due to the resemblance of their stems to corn stalks. 

Here's a more detailed look at the characteristics of Dracaenas:

General Features:

Foliage:

Dracaenas typically have long, narrow, and pointed leaves that can be either green or variegated. 

Stems:

Stems can be thick and woody, or more slender and cane-like, often with distinct leaf scars. 

Growth Habit:

They can range from small shrubs to large trees, depending on the species. 

Flowers:

Some Dracaena species produce fragrant, small, white or cream-colored flowers, sometimes followed by berries. 

Air Purification:

Many Dracaena species are known to be effective at removing indoor air pollutants like formaldehyde. 

Water Needs:

Dracaenas prefer to dry out slightly between waterings and are sensitive to overwatering, which can lead to root rot. 

Light Requirements:

They thrive in bright, indirect light but can tolerate lower light conditions. 

Toxicity:

Dracaenas can be toxic to pets if ingested, so it's important to keep them out of reach. 

Specific Examples:

• Dracaena fragrans (Corn Plant): Known for its broad, green leaves with a yellow stripe down the center. 
• Dracaena marginata (Madagascar Dragon Tree): Features slender stems and narrow, arching leaves with red edges. 
• Dracaena sanderiana (Lucky Bamboo): A popular houseplant with slender, slightly twisted, gray-green leaves. 
• Dracaena reflexa (Song of India/Jamaica): Valued for its richly colored, evergreen leaves and irregular stems. 
• Dracaena cinnabari (Socotra Dragon Tree): A distinctive tree with blood-red sap, native to the Socotra archipelago.