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Round Leaved Boykinia
Boykinia rotundifolia

About Round Leaved Boykinia (Boykinia rotundifolia) Boykinia rotundifolia is an uncommon species of flowering plant in the saxifrage family known by the common name Roundleafed Brookfoam. It is endemic to southern California from Ventura to San Diego Counties, where it grows in shady forested areas near streams in the mountains below 6,000 ft. It is a rhizomatous perennial herb producing leaves with blades up to 30 centimeters long, borne on petioles up to 18 centimeters in length. Each leaf has several rounded lobes with dull teeth along the edges. The flower cluster reaches up to a meter tall on a thin stem. It bears a dense array of many small white flowers, each with five tiny pointed sepals and five larger oval petals.
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 3.3 ft (0.3 - 1 m)

Max. Width
1 ft (0.3 m)

Summer Semi-Deciduous

Flower Color

Flowering Season
Spring, Summer

Native Status

Natural Setting
Site Type
Streambanks, seeps, and other damp locations

Part Shade

Elevation ?
432' - 7419'

Annual Precip. ?
5.0" - 44.2"

Summer Precip. ?
0.16" - 2.56"

Coldest Month ?
33.5° F - 55.3° F

Hottest Month ?
60.3° F - 84.0° F

Humidity ?
2.29 vpd - 34.80 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 ?
4*, 5*, 6, 7, 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.), and Western Dichondra (Dichondra occidentalis)

Landscaping Information
Ease of Care
Moderately Easy

Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Seldom Used

Max. Summer Water ?
No Summer Water
Keep moist

Propagation ?
For propagating by seed: No treatment.

Common uses

Nursery Availability
Rarely Available

Other Names
Common Names
Roundleaf Brookfoam, Roundleafed 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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