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California Sun Cup
Eulobus californicus

About California Sun Cup (Eulobus californicus) Camissonia californica is a species of flowering plant in the evening primrose family known by the common name California suncup. It is native to California, Arizona, and adjacent northwestern Mexico, where it grows in scrub and chaparral plant communities. This is an annual herb which produces a basal rosette of leaves and then bolts a slender, erect stem which can exceed 1.5 meters in height. The larger leaves are located in the ground-level rosette; those on the stem are small and thready. The upper stem is an flower cluster bearing widely spaced flowers on long pedicels. Each flower is a cup of four bright yellow petals, sometimes with red speckles near the bases. Behind the flowers are four smaller sepals, which are greenish and reflexed back against the pedicel. The fruit is a cylindrical capsule 4 to 10 centimeters long.
Plant Description
Plant Type
Annual herb

Max. Height
0.07 - 4.9 ft (0.02 - 1.5 m)

Flower Color
Yellow, Red

Native Status

Natural Setting
Site Type
Open places


Elevation ?
0' - 6112'

Annual Precip. ?
2.7" - 33.8"

Summer Precip. ?
0.14" - 2.67"

Coldest Month ?
33.7° F - 59.0° F

Hottest Month ?
64.6° F - 88.7° F

Humidity ?
0.73 vpd - 39.08 vpd

Sunset Zones ?
7*, 8*, 9*, 10*, 11*, 12*, 14*, 15*, 16*, 17*, 18, 19*, 20*, 21*, 22*, 23*, 24*

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Botanical Names
Camissonia californica

Common Names
California Primrose, California Suncup

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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