Cassia biflora, also known as twin-flowered senna or desert cassia, is a perennial shrub or small tree with feathery branches and an arching canopy, native to South America. It's characterized by bright yellow, paired flowers and is popular for its ornamental value and relatively low maintenance. The plant grows to a height of 2 to 15 meters, depending on conditions. 

Detailed Description:

Appearance: Cassia biflora features feathery branches and an arching or spreading canopy. 

Flowers: The most striking feature is the bright yellow, paired flowers that give the plant its common name, "twin-flowered senna". 

Leaves: It has alternate, even pinnately compound leaves with bright green, glossy leaflets. 

Fruit: The plant produces long, narrow pods containing seeds. 

Size: It can grow to be 2 to 15 meters tall. 

Native Range: Native to tropical South America. 

Cultivation: Widely cultivated as an ornamental plant in various regions, particularly in India, for its attractive blooms and low maintenance needs. 

Sun and Soil: It thrives in full sun to partial shade and prefers well-drained sandy soil. 

Water Needs: It is drought-tolerant and can tolerate less water once established. 

Other Names: It is also known as the Golden Shower Shrub and Yellow Candlestick.