Cerastium arvense

From Puget Prairie Plants
Revision as of 08:45, 14 May 2012 by Stamic06 (Talk | contribs) (Description)

Common name: Field chickweed


Abbreviation code: CEAR


  • Kingdom: Plantae
  • (unranked): Angiosperms
  • (unranked): Eudicots
  • (unranked): Core eudicots
  • Order: Caryophyllales
  • Family: Caryophyllaceae
  • Genus: Cerastium
  • Species: C. arvense


General: Tufted perennial, often forming loose mats to 4 dm. broad, glabrous to glandular-pubescent, the flowering stems 5-50 cm. tall.

Leaves: Leaves opposite, linear to narrowly lanceolate, 1-nerved, 1-3 cm. long; cauline leaves often with bundles of secondary leaves in their axils.

Flowers: Flowers 3 to 5 or more in an open inflorescence; pedicels slender, erect, 1-3 cm. long; sepals 5, 4-6 mm. long, with stalked glands; petals 5, white, twice as long as the sepals, deeply bi-lobed-obcordate; stamens 10; styles 5. Fruit: Capsule membranous, cylindric, slightly curved, 1.5 times as long as the sepals, opening by 10 teeth.

Bloom Period






Cerastium arvense seeds
Photo Credit Lisa Hintz

Seed sample from: 2011

Average Measurement: 0.9 x 0.9 x 0.5

Measurement Range: L: 0.75 – 1, W: 0.8 – 1, D: 0.4 – 0.6

Shape: Seed somewhat kidney shaped, narrower at hilum and broadening at opposite apex. Hilum pinched.

Color: Rusty brown to orange brown. Hilum white.

Surface: Matte and covered with many small bumps, arranged in concentric half circles originating at the hilum and broadening at the opposite apex.

Latitudinal Cross Section: elliptical CEAR lat.png

Longitudinal Cross Section: obovate CEAR long.png

Basic Explanations and Assumptions:

The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.

Measurements included are the mean average for each measurement of ten separate seeds.

All measurements in millimeters unless otherwise noted.

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