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Montana Field Guide

Montana Field Guides

Chaffweed - Centunculus minimus
Other Names:  Anagallis minima

Species of Concern

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

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Known from scattered locations across the state, though it is rare to uncommon in Montana. May be susceptible to some adverse impacts from human-caused disturbance due to its preference for vernally moist habitats in valley loctions.
General Description
Chaffweed is a low, annual herb with prostrate or erect stems, 2-10 cm long, that root at the nodes. The alternate leaves, 5-10 mm long, are egg to spoon-shaped with entire margins. Foliage is glabrous. Solitary, inconspicuous flowers on short stalks occur in the leaf axils. Each flower has a deeply 4-lobed calyx, 2-3 mm long, and a small, pink, 4-lobed, tubular corolla, ca. 1 mm long, that withers on the maturing ovary. There are 4-5 stamens, and the fruit is a globose capsule that is ca. 2 mm long.

Flowering and fruiting June-September.

Diagnostic Characteristics
Glaux maritima is similar but has lower leaves that are opposite each other.

Species Range

Range Comments
Europe, South America, and in North America irregularly from Nova Scotia to British Columbia and south to Florida, California, and Mexico (except for much of the Rocky Mountains and Great Basin).

Summary of Observations Submitted for Montana
Number of Observations: 26

(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)

Vernally wet, sparsely vegetated soil around ponds and along rivers and streams in the valleys and on the plains.

Ecological Systems Associated with this Species

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Citation for data on this website:
Chaffweed — Centunculus minimus.  Montana Field Guide.  .  Retrieved on , from