Gentiana calycosa, commonly known as Rainier pleated gentian or mountain bog gentian, is a perennial herb that is native to subalpine meadows and moist alpine zones in the western United States and Canada, particularly from the Sierra Nevada of California northward to the Canadian Cascades. It typically inhabits wet meadows, seepage areas, and the edges of streams, where it contributes to the biodiversity of high-altitude ecosystems. This species reaches a modest height of 6 to 12 inches (15-30 cm) with a similar spread. The Rainier pleated gentian is characterized by its hardy, thick green leaves on thin red stems and its striking funnel-shaped flowers. The blooms, which appear from late summer to early fall, are deep blue to purple and measure 1 to 2 inches wide, making them quite showy against the foliage.

In cultivation, G. calycosa is valued for its vibrant flower color and is often used in rock gardens, alpine collections, and as an accent in moist, shaded beds. It requires consistently moist, well-draining soils that are rich in organic matter, and it thrives in cool, temperate climates. While it prefers full sun to partial shade, in hotter regions, it benefits from afternoon shade to prevent scorching. Due to its specific habitat requirements, it can be a challenge to grow in lower elevations or drier climates. Gardeners should be aware that while not common, crown rot can occur if the soil is too wet or poorly drained.CC BY-SA 4.0