Soft Rush - Juncus effusus
* (see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Plants in Montana are Juncus effuses ssp. effusus. This subspecies is an aggressive introduced species from Europe, and has colonized in British Columbia and Idaho (Zika 2003).
- Details on Status Ranking and Review
Soft Rush (Juncus effusus) Conservation Status Review
Review Date =
Short-rhizomatous, caespitose. Stems erect, terete, hollow, 40–100 cm. Leaves mainly basal; blades reduced to a bristle; auricles absent; sheaths purple to brown. Inflorescence open or congested with numerous, pedicellate flowers; bract terete, erect, appearing like a continuation of the stem. Flowers with prophylls; tepals brown with green midvein, 2–3 mm long, acuminate; stamens 3. Capsules ca. 2 mm long, truncate on top; seeds apiculate (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Our plants are subspecies effusus
, which is introduced from Europe. J. effusus
is distinguished by thin, green, symmetrical upper sheaths that are less than 14 centimeters long and have overlapping margins in the upper third. Also, this subspecies has spreading tepals (Zika 2003). See Zika 2003 for comparative illustrations and a key.