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Montana Field Guide

Montana Field Guides

Macoun's Gentian - Gentianopsis macounii
Other Names:  Gentiana macounii, Gentianella crinita ssp. macounii, Gentianopsis procera ssp. macounii, Gentiana detonsa, Gentianopsis virgata ssp. macounii

Species of Concern

Global Rank: G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank: 2

External Links

State Rank Reason (see State Rank above)
Rare in Montana, where it is known from several sites just east of the Continental Divide.
General Description
Macoun's Gentian is a glabrous annual with erect, simple to few-branched stems that are 5-50 cm high. The basal leaves are 2-3 cm long and lance-shaped with blunt tips. The opposite stem leaves are narrower with pointed tips. A solitary, long-stalked flower occurs at the stem tip, while others may arise from the upper leaf axils. The calyx is 15-25 mm long and has 4 pointed lobes and small, white bumps at the base. The deep blue, tubular corolla is 2-5 cm long and has 4 broad, spreading, fringed lobes. The 4 stamens have hairs at midlength. The fruit is a stalked, narrowly elliptic, many-seeded capsule that is 12-25 mm long.

Lesica (2012) splits out of this species Gentianopsis detonsa, which is diagnosed by the presense of papillae on the ribs of the calyx.

Flowering in August, fruiting in early September.

Diagnostic Characteristics
Gentianopsis dentosa is similar but lacks the small white bumps at the base of the calyx.

Species Range

Range Comments
Yukon to Quebec, south to BC, MT, and ND. Peripheral.

Summary of Observations Submitted for Montana
Number of Observations: 17

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Wet, organic soil of calcareous fens in the valley and foothill zones.

Ecological Systems Associated with this Species

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Citation for data on this website:
Macoun's Gentian — Gentianopsis macounii.  Montana Field Guide.  .  Retrieved on , from