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|Family: Juncaceae||View Description||Dichotomous Key|
|Genus: Juncus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Juncus occidentalis (Coville) Wiegand
Habit: Perennial herb, cespitose, 30--60 cm, stiff. Leaf: many, basal; sheath appendages < 1.5 mm, membranous; blade with flat side toward stem, generally < 1/2 stem, 1--1.5 mm wide, crosswalls 0. Inflorescence: generally clustered on coast, more open inland; flowers 1; lowest bract generally > inflorescence; bractlets 2 per flower, blunt to bristle-tipped. Flower: perianth parts generally 2.8--5 mm, +- equal, erect or spreading, green inland or generally brown-striped on coast, scarious margins wide; stamens 6, filaments >= anthers. Fruit: <= 3/4 perianth, oblong to ovate, 3-angled, dark brown; tip generally truncate to notched; chamber 1, partitions concave. Seed: oblong; appendages short.
Ecology: Moist generally sunny areas; Elevation: < 2400 m. Bioregional Distribution: NW, CaR, n&c SN, ScV, CW (exc SCoRI), SCo, WTR, PR (exc SnJt); Distribution Outside California: to British Columbia, northern Baja California. Fruiting Time: May--Sep Note: Inland, montane plants with pale spreading perianth parts, flowers smaller than coastal populations, need study. Hybridizes with Juncus tenuis, rarely with Juncus trilocularis.
Synonyms: Juncus tenuis Willd. var. congestus Engelm.; Juncus tenuis var. occidentalis Coville
eFlora Treatment Author: Peter F. Zika
Jepson Online Interchange
Previous taxon: Juncus nodosus
Next taxon: Juncus orthophyllus
Citation for this treatment: Peter F. Zika 2017. Juncus occidentalis, in Jepson Flora Project (eds.) Jepson eFlora, Revision 3, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76520, accessed on March 28, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on March 28, 2017.