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Montana Field Guide

Montana Field Guides

Pygmy Gentian - Gentiana prostrata

Status Under Review

Global Rank: G4G5
State Rank: SU

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

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General Description
Pygmy Gentian is a low annual to short-lived perennial herb with several prostrate to erect stems that are 1-10 cm long. The broadly elliptic, opposite, overlapping leaves sheathe the stem and are 3-5 mm long with pale margins. The light green foliage is glabrous. Solitary flowers are borne at the stem tips. The green or bluish, tubular calyx is 6-14 mm long and has 4 lobes that are each 1/3 the length of the tube. The light blue, tubular corolla is 12-22 mm long and has 4 lobes with conspicuous plaits between the lobes. Corolla lobes spread open during mid-day but are otherwise twisted closed. The narrowly elliptic, stalked capsule is ca. 1 cm long.

Phenology
Flowering in June-August; variable with elevation.

Diagnostic Characteristics
Gentiana aquatica is very similar but has white flowers and usually occurs at lower elevations. Gentiana glauca has creeping stems but usually bears more than one flower per stem.

Range Comments
Circumboreal, south in western N. America to CA and CO; S. America. Sparse.

Habitat
Moist tundra, rock ledges, and gravelly soil in the alpine zone.

References
  • Additional ReferencesLegend:   View Online Publication
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    • Achuff, P. L. and L. S. Roe. 1992. Botanical survey of the Goat Flat proposed Research Natural Area, Deerlodge National Forest. Unpublished report to the Deerlodge National Forest. Montana Natural Heritage Program, Helena, MT. 31 pp.
    • Fertig, W. and M. Bynum. 1994. Biological report on the proposed Twin Lakes Research Natural Area. Unpublished report to the Shoshone National Forest. Wyoming Natural Diversity Database, Laramie, Wyoming. 33 pp. plus appendices.
    • Iltis, H.H. 1965. The genus Gentianopsis (Gentianaceae): transfers and phytogeographic comments. Sida 2:129-153.
    • Lesica, P. 1993. Vegetation and flora of the Line Creek Plateau area, Carbon County, Montana. Unpublished report to USDA Forest Service, Intermountain Research Station. Montana Natural Heritage Program, Helena, Montana. 30 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Spira, T.P. 1984. Comparative demography of alpine biennial and perennial gentians (Gentiana spp.) in California. American Journal of Botany 71:90.
    • Spira, T.P. and O.D. Pollak. 1986. Comparative reproductive biology of alpine biennial and perennial gentians (Gentiana: Gentianaceae) in California. American Journal of Botany 73(1):39-47.
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Citation for data on this website:
Pygmy Gentian — Gentiana prostrata.  Montana Field Guide.  .  Retrieved on , from