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Tetrapteron graciliflorum
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Hill Sun Cup
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Tetrapteron graciliflorum

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About Hill Sun Cup (Tetrapteron graciliflorum) Tetrapteron graciliflorum is a species of evening primrose known by the common name hill suncup. It is native to Oregon and California, where it grows in several habitat types, often on clay soils. It is an annual herb generally with no stem but producing an upright, nodding inflorescence. There is a cluster of narrow leaves each one to ten centimeters long. The flowers have bright yellow petals one half to two centimeters long. The fruit is a leathery capsule less than a centimeter in length with four chambers containing bumpy brown seeds.
Plant Description
Plant Type
Annual herb

Max. Height
1 in (2.5 cm)

Flower Color

Native Status

Natural Setting
Elevation ?
40' - 11310'

Annual Precip. ?
5.8" - 75.6"

Summer Precip. ?
0.14" - 1.98"

Coldest Month ?
24.6° F - 52.6° F

Hottest Month ?
45.5° F - 78.5° F

Humidity ?
0.83 vpd - 29.30 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Hill 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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