|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Onagraceae||View Description||Dichotomous Key|
|Genus: Oenothera||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Oenothera biennis L.
Habit: Biennial, rosetted; hairs glandular (especially inflorescence), spreading (blister-like bases generally 0), and minutely strigose. Stem: erect, 3--20 dm. Leaf: cauline 5--20 cm, oblanceolate to elliptic, +- entire to dentate, +- lobed toward base. Inflorescence: spike, dense. Flower: hypanthium (20)25--40 mm; sepals 12--20(28) mm, green or +- yellow, rarely +- red, free tips in bud 1.5--3 mm; petals 10--25(30) mm, yellow fading duller or orange. Fruit: 20--40 mm, 4--6 mm wide, cylindric, +- straight. Seed: 1--2 mm, angled, irregularly pitted. Chromosomes: 2n=14.
Ecology: Disturbed places; Elevation: generally < 300 m. Bioregional Distribution: NW, CW, SW; Distribution Outside California: native to central and eastern North America; +- weedy worldwide. Flowering Time: Jun--Sep Note: Generally cross-pollinated; permanent translocation heterozygote.
eFlora Treatment Author: Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner
Jepson Online Interchange
Previous taxon: Oenothera
Next taxon: Oenothera californica
Citation for this treatment: Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner 2017. Oenothera biennis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34975, accessed on February 19, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 19, 2017.