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|Family: Juncaceae||View Description||Dichotomous Key|
|Genus: Juncus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Juncus tenuis Willd.
Habit: Perennial herb, cespitose, stem 20--60 cm, generally 0--1 strong ridges per side. Leaf: sheath margins membranous, sheath appendages generally acute to acuminate, thin, +- translucent, generally 1--8 mm until late in season when generally smaller or 0; blade with flat side toward stem, 1/2 to = stem, 1--1.3 mm wide, not stiff, crosswalls 0. Inflorescence: +- open; lower bracts leaf-like, generally > inflorescence; branches unequal; flowers 1, generally > internodes, +- denser near branch tips; bractlets 2 per flower, acute to blunt. Flower: perianth parts 3--4.5 mm, +- equal, lanceolate, acuminate, spreading in fruit, green to +- red or pale brown; stamens 6, filaments >> anthers. Fruit: < perianth, widely ovoid, blunt to acute; chamber 1, partitions incomplete. Seed: 0.4--0.5 mm, oblong; appendages minute, blunt. Chromosomes: 2n=80.
Ecology: Uncommon. Damp places; Elevation: generally < 1500 m. Bioregional Distribution: NW, CaR, SN (exc Teh), GV, CCo, SnGb, MP; Distribution Outside California: North America, introduced worldwide except Antarctica. Fruiting Time: Jun--Sep Note: Hybridizes with Juncus occidentalis.
eFlora Treatment Author: Peter F. Zika
Jepson Online Interchange
Previous taxon: Juncus supiniformis
Next taxon: Juncus textilis
Citation for this treatment: Peter F. Zika 2016. Juncus tenuis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29725, accessed on May 31, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 31, 2016.