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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 cooperi Engelm.
Habit: Perennial herb, +- cespitose, 40--80 cm; rhizome short, thick, many-branched; roots large, spongy. Leaf: basal; blades short, stiff, cylindric, tips sharp. Inflorescence: appearing lateral; lowest bract cylindric, resembling stem, > inflorescence, tip sharp; branches unequal; clusters 2--10-flowered; bracts within inflorescence obvious, > cluster; bractlets white. Flower: perianth parts 4--6 mm, sepals > petals, pale +- green-straw-colored, sepal tips generally acuminate, spiny, firm; stamens 6, large, filaments < anthers. Fruit: +- = perianth, narrowly oblong, 3-angled. Seed: with a conspicuous white ridge; appendages unequal, minute.
Ecology: Alkaline places; Elevation: < 700 m. Bioregional Distribution: D; Distribution Outside California: Nevada, Mexico. Fruiting Time: May--Oct
eFlora Treatment Author: Peter F. Zika
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory
Previous taxon: Juncus confusus
Next taxon: Juncus covillei
Citation for this treatment: Peter F. Zika 2017. Juncus cooperi, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29632, accessed on February 23, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 23, 2017.