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Clarkia williamsonii
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Fort Miller Clarkia
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Clarkia williamsonii

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About Fort Miller Clarkia (Clarkia williamsonii) Clarkia williamsonii is a species of flowering plant in the evening primrose family known by the common name Fort Miller clarkia. It is endemic to California, where it is known from the forests and woodlands of the northern and central Sierra Nevada foothills. This is an erect annual herb with linear to lance-shaped leaves each a few centimeters long. The flower cluster produces opening flowers and buds which are closed except for the tips, where the sepals do not fuse. The sepals all separate or remain fused in pairs as the flower blooms. Each fan-shaped petal is up to 3 centimeters long and is usually lavender with a white area and a purple spot in the middle. The petals are occasionally solid deep red.
Plant Description
Plant Type
Annual herb

Max. Height
3.3 ft (1 m)

Flower Color
Pink, White, Purple, Lavender

Flowering Season
Spring, Summer

Native Status

Natural Setting
Sun, Part Shade

Elevation ?
15' - 6768'

Annual Precip. ?
10.4" - 56.1"

Summer Precip. ?
0.22" - 1.82"

Coldest Month ?
31.7° F - 51.9° F

Hottest Month ?
55.6° F - 77.7° F

Humidity ?
1.43 vpd - 26.02 vpd

Sunset Zones ?
1, 2, 3, 6, 7*, 14*, 15*, 16*, 17*, 18*, 19, 20, 21, 22, 23, 24

Landscaping Information
Ease of Care
Moderately Easy

Common uses
Butterfly Gardens, Bee Gardens

Nursery Availability
Rarely 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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