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|Jepson eFlora: Taxon page
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|Family: Juncaceae||View Description||Dichotomous Key|
|Genus: Juncus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Juncus usitatus L.A.S. Johnson
Habit: Perennial herb, densely cespitose. Stem: < 115 cm, 1--4.7 mm wide above sheath, rough when fresh, < 25 fine ridges per side when dry, pith chambered (unchambered). Leaf: upper sheaths 8--22 cm, base shiny, mid- to dark-brown, distally green to pale brown, dull, generally loose, veins gradually converging at narrowly symmetrical summit, margins thin, flat, pale, overlapping halfway; Flower: perianth 1--1.9 mm, << and pressed to fruit, green, pale brown, or +- red, scarious margins wide, sepals acute, petals blunt; stamens 3, filaments >= anthers. Fruit: +- globose, blunt, pale brown, 1.1--2.2 mm, inner partitions concave, chambers 1; seed 0.3--0.5 × 0.15--0.25 mm wide, +- oblong; appendages minute.
Ecology: Ponds, floodplains, seeps, wet disturbed ground; Elevation: < 350 m. Bioregional Distribution: CaRF, n SNF, ScV, n SnJV; Distribution Outside California: Australia, New Zealand, introduced in United Kingdom. Fruiting Time: Jun--Oct Note: Invasive, generally mistaken for Juncus effusus and allies.
eFlora Treatment Author: Peter F. Zika
Jepson Online Interchange
Previous taxon: Juncus uncialis
Next taxon: Juncus xiphioides
Citation for this treatment: Peter F. Zika 2016. Juncus usitatus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80171, accessed on May 30, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 30, 2016.