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Montana Field Guide

Montana Field Guides

Bractless Hedge-hyssop - Gratiola ebracteata

Species of Concern

Global Rank: G4
State Rank: S2
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank: 3
C-value: 8

External Links

State Rank Reason (see State Rank above)
Rare and peripheral in Montana. Currently known from approximately a half-dozen wetlands along the Rocky Mountain Front and from a couple historical collections. Available data for the species are limited. However, threats to existing populations appear to be minimal. As an annual, population levels likely fluctuate widely from year to year.
General Description
Bractless Hedge-hyssop is a glabrous annual with an erect, simple or branched stem that is 5-15 cm high. The opposite, long-pointed, lance-shaped leaves are 1-4 cm long, have entire margins, and lack petioles. Long-stalked flowers arise from the leaf axils. The 5 long-pointed, lance-shaped sepals are often over 1 cm long. The white to yellow corolla is 5-7 mm long, has a short upper lip, and a 3-lobed lower lip. The seed capsule is globose and 4-5 mm high.

Flowering late June-August.

Diagnostic Characteristics
The calyx of Gratiola neglecta is subtended by 2 bracts and thus appears to have 7 lobes rather than 5; these lobes are rarely greater than 7 mm long.

Species Range

Range Comments
BC, MT south to CA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 9

(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)

Drying mud around ponds in the foothills and on the plains.

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Citation for data on this website:
Bractless Hedge-hyssop — Gratiola ebracteata.  Montana Field Guide.  .  Retrieved on , from