Cedarglade St. John's wort leaves are linear to oblanceolate, typically measuring up to 3 inches (7.6 cm) in length. They are arranged oppositely or whorled in a decussate pattern and exhibit a simple, entire structure. The leaves are either sessile or have extremely short petioles. The overall texture is smooth, and the veins are parallel, contributing to their distinct, slender appearance. These key features are essential for accurate identification of the leaves of cedarglade St. John's wort.

The flowers of cedarglade St. John's wort are a striking yellow, typically with five petals (occasionally four), and measure about 1-2 inches (2.5-5 cm) across. Each blossom features numerous bushy stamens grouped in bundles, creating a showy, radiant center. These flowers are either solitary or arranged in small cymes, appearing at the terminal ends or axils of branches. The blooming period is from late spring to mid-summer, releasing a sweet, subtle fragrance that attracts pollinators.

The stem of cedarglade St. John's wort is characterized by 2 to 4, sometimes up to 6, ridges on newer growth, giving it a distinctive textured appearance. As the stem matures, it becomes smooth and rounded. The color shifts from green in its early stages to a more brownish hue as it ages. Stems vary in thickness, typically ranging from 0.1 to 0.2 inches (2.5 to 5 mm). The branching pattern is generally erect and spreading, adding to the plant’s bushy form.

The fruit of cedarglade St. John's wort is a distinctive oval capsule that may be characterized by its 2 to 5 cell structure. This capsule, possibly bearing a fleshy texture, houses multiple seeds. At maturity, the capsule changes color, aiding in its identification. Each cell within the capsule can be thought of as a chamber for seed development. Key to recognizing the fruit is its size, which, while varying, remains in close adherence to its species-specific range. The robust yet simple build of the fruit is a classic trait for plant aficionados to note.