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Western Centaury is an annual herb with usually unbranched stems that are 5-25 cm high. The basal leaves are lance-shaped to narrowly elliptic and 5-25 mm long, while those of the stem are longer and narrower. The leaves lack petioles and are opposite each other on the stem. Foliage is glabrous. One to a few erect flowers are borne on 1-4 cm long stalks 1-4 at the top of the stems. The white to ...

Glaucous Gentian is a glabrous, perennial herb. Its stems are 3-10 cm high and arise from rosettes that arise from creeping rhizomes. The fleshy rosette leaves are egg-shaped and 1-2 cm long, while stem leaves of fertile rosettes are opposite and smaller. 3-5 crowded, short-stalked flowers arise from the axils of the upper leaves, or bracts. The tubular, blue corollas are 1-2 cm long and have 5 ...

Slender Gentian is a small, glabrous, annual herb which stands 2-15 cm tall; Montana collections are on the small end of this range. The stems are 4-angled and may be branched; those of small plants are often unbranched. There are usually several spoon-shaped basal leaves which are 3-10 mm long, and few, if any, slightly larger, opposite stem leaves, which are 5-15 mm long. There are one to a fe...