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Boykinia major
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Stream Boykinia
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Boykinia major

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About Stream Boykinia (Boykinia major) Boykinia major is a species of flowering plant in the saxifrage family known by the common name large boykinia. It is native to the western United States from California to Montana, where it grows in shady forest understory and wet mountain meadows. It is a rhizomatous perennial herb producing large leaves with blades up to 50 centimeters long, borne on petioles up to 35 centimeters in length. Each leaf has several lobes which are often sharply toothed along the edges. The flower cluster reaches up to a meter tall on a thin stem. It bears a dense, flat-topped array of many small white flowers with yellowish centers, each with five pointed sepals and five larger rounded or oval petals.
Plant Description
Plant Type
Perennial herb

Max. Height
1.6 - 3.3 ft (0.49 - 1 m)

Flower Color
Yellow, White

Native Status

Natural Setting
Site Type
Moist meadows

Shade, Part Shade

Elevation ?
185' - 7446'

Annual Precip. ?
13.1" - 154.4"

Summer Precip. ?
0.33" - 5.76"

Coldest Month ?
30.2° F - 52.0° F

Hottest Month ?
51.1° F - 79.3° F

Humidity ?
0.31 vpd - 22.19 vpd

Sunset Zones ?
1, 2, 3*, 4*, 5*, 6*, 7*, 8*, 9*, 14*, 15*, 16*, 17*

Landscaping Information
Common uses

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Large Boykinia

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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