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Dichelostemma congestum

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About Ookow (Dichelostemma congestum) Dichelostemma congestum is a species of flowering plant known by the common name ookow or fork-toothed ookow. This perennial wildflower is native to the hills and mountains of western North America. Its tall, thin, naked stem is topped with an flower cluster packed densely with six to 15 flowers, each about a centimeter wide and long, with usually six petal-like lobes in shades of bright purple. It was first published in 1811 as Brodiaea congesta.
Plant Description
Plant Type
Perennial herb

Max. Height
3.6 in (9.1 cm)

Flower Color
Blue, Lavender, Purple

Flowering Season

Native Status

Natural Setting
Site Type
Open, grassy places

Sun, Part Shade

Elevation ?
2' - 5683'

Annual Precip. ?
19.5" - 92.2"

Summer Precip. ?
0.20" - 2.19"

Coldest Month ?
32.2° F - 50.6° F

Hottest Month ?
58.5° F - 75.6° F

Humidity ?
0.37 vpd - 24.78 vpd

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

Landscaping Information
Ease of Care
Moderately Easy

Propagation ?
For propagating by seed: Sow outdoors in fall. Optimum germination requires wide diurnal fluctuation (40° to 80°F; light not critical ( Keator 1968).

Common uses
Butterfly Gardens

Nursery Availability
Rarely Available

Other Names
Common Names
Fork-toothed Ookow

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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