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Boykinia occidentalis

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About Brook Foam (Boykinia occidentalis) Boykinia occidentalis is a species of flowering plant in the saxifrage family known by the common name coastal brookfoam. It is native to the west coast of North America from British Columbia to Los Angeles County and in the central Sierras. It grows in shady areas near riverbanks and streams. It is a rhizomatous perennial herb producing large, palmate leaves with blades up to 45 centimeters long and 12 wide, borne on petioles up to 30 centimeters in length. Each leaf has several rounded lobes with dull teeth along the edges. The flower cluster reaches 30 to 60 centimeters tall on a thin stem. It bears an open array of many small white flowers, each with five tiny pointed sepals and five larger oval petals. The flowers are somewhat more showy than the closely related Boykinia rotundifolia.
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 2 ft (0.3 - 0.6 m)

Max. Width
1.5 ft (0.5 m)


Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Shady stream banks

Part Shade

Elevation ?
7' - 6614'

Annual Precip. ?
16.1" - 128.9"

Summer Precip. ?
0.17" - 4.71"

Coldest Month ?
29.4° F - 55.6° F

Hottest Month ?
58.7° F - 77.0° F

Humidity ?
0.01 vpd - 25.10 vpd

Soil Description
Tolerates a variety of soils as long as adequate moisture is present

Soil PH
5.0 - 7.5


Cold Tolerance(° F)
Tolerates cold to 15° F

Sunset Zones ?
2, 3*, 4*, 5*, 6*, 7*, 8*, 9*, 14*, 15*, 16*, 17*, 18*, 19*, 20*, 21*, 22*, 23*, 24*

Companion Plants
This plant is best used in a damp shade garden with similar plants such as Heuchera sp., ferns, Meadow Rue (Thalictrum sp.), Western Dichondra (Dichondra occidentalis), Wild Ginger (Asarum sp.), and False Lily Of The Valley (Maianthemum dilatatum)

Landscaping Information
Water Requirement ?
Low, Moderate - High
Extremely Low
Very Low
Moderate - High

Moderately Popular

Max. Summer Water ?
No Summer Water
Keep moist

Nursery Availability
Commonly Available

Other Names
Common Names
Coastal Brookfoam

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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