The leaves of gas plant are glossy, light-green, and remain visually appealing throughout the growing season. They emit a lemony fragrance when crushed. The leaves are pinnate and measure between 2 to 4 inches (5 to 10 cm) in length. They are arranged alternately on the stem and feature a smooth texture with a prominent vein pattern. This distinctive combination of traits, especially the fragrant nature, makes them easily identifiable.

Gas plant presents 1-inch (2.5 cm) fragrant flowers arranged in terminal racemes, each showcasing five petals. The blooms, appearing in shades of white, lavender, or pink, feature long, projecting stamens, creating a distinctive appearance. Flowering occurs from late spring to early summer, providing sensory delight with their sweet fragrance and striking visual appeal. The petal arrangement and extended stamens make these flowers easily identifiable, contributing significantly to the plant's ornamental value.

The stem of gas plant is rigid and sturdy, growing to a height of 2 to 4 feet (60 to 120 cm). It has a woody texture and an erect posture that requires no additional support. The color is a distinctive green with a hint of brown, particularly towards the base. The stem is moderately thick, smoothing out in younger sections and becoming rougher and more fibrous as it matures. Branching occurs in an orderly pattern, usually near the upper sections of the stem.

The fruit of gas plant is a capsule that develops after the distinctive flowering stage. This capsule, once ripened, splits open to reveal numerous small, shiny black seeds. The seeds are arranged in a star-shaped pattern, which remains visually appealing even when left on the plant post-maturity. Measuring around 0.5 inches (1.3 cm) in diameter, each seed head presents a textured surface, adding an extra dimension of ornamental interest to the plant during the fall season. The dry, dehiscent capsules contribute to the unique appearance with their persistent star-like form.