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Montana Field Guide

Montana Field Guides

Short-seeded Waterwort - Elatine brachysperma

Status Under Review

Global Rank: G5
State Rank: SU

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

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General Description
Short-seeded Water-wort is a tiny, glabrous annual, growing submerged or exposed, that roots freely at the nodes and forms small mats. The opposite, linear- to spatula- shaped, entire margined leaves are usually less than 1 cm long. The minute flowers are borne solitary and sessile in the leaf axils and have sepals, petals, and stamens in sets of 2 or 3, and a single pistil. The mature fruits are thin, transparent walled, 2 or 3 celled capsules the size of a pin head. The seeds are regularly reticulate with 10-15 pits in each of 6-8 longitudinal rows.

Phenology
Fruit mature in late August-October.

Diagnostic Characteristics
Distinguished from other Montana Elatine species by having sessile, 2-3 chambered capsules that contain short, only slightly curved seeds with relatively few reticulations per row. A compound microscope and technical key are needed for positive identification.

Species Range
Present
 


Range Comments
WA, MT to OH, south to CA, TX, GA. Known from Gallatin and Missoula counties (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 3

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

Recency

 

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



Habitat
Shallow waters, shores and mudflats of lakes and ponds in valleys.

References
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Citation for data on this website:
Short-seeded Waterwort — Elatine brachysperma.  Montana Field Guide.  .  Retrieved on , from