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Clarkia borealis
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Northern Clarkia
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Clarkia borealis

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About Northern Clarkia (Clarkia borealis) Clarkia borealis is a rare species of flowering plant in the evening primrose family known by the common name northern clarkia. It is endemic to California, where it is known from the forests of the southern Klamath Range and the southernmost Cascade Range foothills. It is an annual herb growing an erect, slender stem. The leaves are oval in shape and borne on short petioles. The top of the stem is occupied by the inflorescence, in which the lowest flowers open first and hanging, pointed flower buds occur at nodes at the top. The sepals separate as the flower blooms, revealing purplish pink petals. Each petal is between 1 and two centimeters long, elongated triangular to semicircular in shape, and sometimes flecked with dark purple. There are 8 stamens with anthers bearing blue-gray pollen, and a protruding stigma. Both subspecies of this plant are rare. ssp. biloba is known from only about 20 occurrences in Shasta and Trinity Counties, and the even less common ssp. arida, the Shasta clarkia, is known only from the forests around Shingletown.
Plant Description
Plant Type
Annual herb

Max. Height
3.3 ft (1 m)

Flower Color
Pink, Purple

Native Status

Natural Setting
Elevation ?
1128' - 4300'

Annual Precip. ?
32.9" - 79.8"

Summer Precip. ?
0.93" - 2.19"

Coldest Month ?
40.4° F - 48.9° F

Hottest Month ?
64.0° F - 74.3° F

Humidity ?
1.86 vpd - 24.51 vpd

Landscaping Information
Common uses
Butterfly Gardens, Bee Gardens

Nursery Availability
Never or Almost Never Available

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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