Vascular Plants - Caryophyllaceae - Holosteum:
Holosteum umbellatum
Page Author: David Giblin
jagged chickweed 
Blooms: April-May
Habit: herb
Duration: annual
Origin: Introduced from Europe
Distribution: Occurring chiefly east of the Cascades crestin Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: Disturbed areas, most common in the shrub-steppe.
Species Description:

General: Somewhat glandular-pubescent annual, the 1-several stems simple or basally branched, 5-20 cm. tall.
Leaves: Leaves mainly in a basal rosette, lanceolate to oblong, 10-20 mm. long; cauline leaves 2-3 remote pairs, ovate-lanceolate, 10-35 mm. long, sessile.
Flowers: Flowers 4-16 in a terminal umbel, the pedicels slender, 2-3 cm. long; sepals 5, distinct, about 3 mm. long; petals 5, white, equaling the calyx, the tips erose; stamens 5; styles 3.
Fruits: Capsule ovoid-cylindric, twice as long as the calyx, opening by 6 valves.
Accepted Name:
Holosteum umbellatum L.
Synonyms:
(none)

Treated in Flora of the PNW as:
Holosteum umbellatum
Additional Resources:

PNW Herbaria Specimens: View list of all Holosteum umbellatum specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Holosteum umbellatum specimens in the WTU Herbarium database.

Washington Flora Checklist: Holosteum umbellatum treatment.

E-Flora BC: Holosteum umbellatum atlas page.

CalPhotos: Holosteum umbellatum images.

USDA Plants Database: Holosteum umbellatum.
Additional photographs of Holosteum umbellatum:
(click on a thumbnail to view larger photo)

Ben Legler, 2003

Ben Legler, 2003

Ben Legler, 2003

Richard Old

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2010

Robert L. Carr, 2010

Robert L. Carr, 2010

Robert L. Carr, 2010

G. D. Carr, 2012

Ron Bockelman, 2015

Ron Bockelman, 2015

Ron Bockelman, 2015

Ron Bockelman, 2015
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