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|Family: Juncaceae||View Description||Dichotomous Key|
|Genus: Juncus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Juncus marginatus Rostk.
Habit: Perennial herb 15--70 cm; rhizome short, thick, knobby. Stem: slender. Leaf: distributed along stem; sheath appendages rounded, scarious; blade with flat side toward stem, exceeded by inflorescence, 1--6 mm wide, not stiff, crosswalls 0. Inflorescence: open to compact; lowest bract << inflorescence; clusters 2--40, 5--12-flowered. Flower: perianth parts 2.5--3.5 mm, sepals < petals, sharply acute, petals blunter, +- red-brown; stamens 3, filaments >> +- purple-red anthers. Fruit: = perianth, spheric; beak 0. Seed: 0.5 mm, ovoid, brown; appendages minute. Chromosomes: 2n=38,40.
Ecology: Locally common in sunny seeps, shallow water, abandoned placer mines; Elevation: 300--950 m. Bioregional Distribution: CaRF (Tehama Co.), n SNF (Nevada Co.); Distribution Outside California: Oregon, native from Arizona to New Mexico, eastern North America, Central America, South America. Fruiting Time: Jul--Aug
Synonyms: Juncus marginatus var. marginatus
Unabridged Note: Juncus marginatus has been tracked as a rare native plant in California, but this is a species with its main distribution in eastern North America. 2 of the 3 known California populations are on greatly disturbed ground (former placer mines). The species was not detected in California until 1965, and it is a recent adventive in Oregon. I can see no strong evidence to consider it native, with the next closest population +- 900 km to the southeastern in Arizona. One of the populations is growing with another wetland species obviously introduced from eastern North America,Vaccinium macrocarpon. The culture of cranberry vines has commonly resulted in the unintentional establishment of many small-seeded wetland species native to the east (Zika 2003 J Torr Bot Soc 130:43--46).
eFlora Treatment Author: Peter F. Zika
Jepson Online Interchange
Previous taxon: Juncus macrophyllus
Next taxon: Juncus mertensianus
Citation for this treatment: Peter F. Zika 2017. Juncus marginatus, in Jepson Flora Project (eds.) Jepson eFlora, Revision 3, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=29681, accessed on April 23, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on April 23, 2017.