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Long-stem Evening-primrose
Oenothera longissima
About Long-stem Evening-primrose (Oenothera longissima) 0 Nurseries Carry This Plant Oenothera longissima is a species of flowering plant in the evening primrose family known by the common name longstem evening primrose. It is native to the southwestern United States, where it grows in relatively moist areas in scrub and woodland habitat. This is a biennial herb producing a tall, erect stem known to well exceed 2 meters in height. The widely lance-shaped leaves may be 22 centimeters in length and may have slight teeth along the edges. The inflorescence is a spike of showy large flowers. Each has yellow petals which may be more than 6 centimeters in length and fade orange or red with age. The fruit is a lance-shaped capsule up to 5. 5 centimeters long.
Plant Description
Plant Type
Plant Type
Perennial herb

2 - 6.6 ft tall

Flower Color
Flower Color
Yellow, Orange, Red

Wildlife Supported

Butterflies & moths hosted ( 5 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Annual Precipitation: 6.1" - 22.6", Summer Precipitation: 0.37" - 2.72", Coldest Month: 37.0" - 51.9", Hottest Month: 66.5" - 77.6", Humidity: 2.86" - 29.04", Elevation: 1168" - 5907"

Alternative Names
Common Names: Longstem Evening Primrose

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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