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Cerastium arvense subsp. strictum
FIELD MOUSE-EAR CHICKWEED

Higher Taxonomy
Family: CaryophyllaceaeView DescriptionDichotomous Key

Common Name: PINK FAMILY
Habit: Annual to perennial herb; rarely dioecious (Silene), taprooted or rhizome generally slender. Leaf: simple, generally opposite (subwhorled), entire, pairs at nodes often +- connected at bases; stipules generally 0; petiole generally 0. Inflorescence: generally cyme, generally open; flowers 1--many; involucre generally 0 (present in Dianthus, Petrorhagia). Flower: generally bisexual, radial; hypanthium often present but obscure; sepals (4)5, +- free or fused into a tube, margins generally scarious, more so on inner 2 or not, tube generally not scarious, awns generally 0; petals (4)5 or 0, generally tapered to base (or with claw long, limb expanded), entire to 2--several-lobed, limb generally without scale-like appendages adaxially, generally without ear-like lobes at base; stamens generally 10, generally fertile, generally free, generally from ovary base; nectaries 0 or 5; ovary superior, generally 1-chambered, placentas basal or free-central, styles 2--5 with 0 branches or 1 with 2--3 branches. Fruit: capsule or utricle (rarely +- dehiscent), generally sessile.
Genera In Family: 83 or 89 genera, 3000 species: widespread, especially arctic, alpine, temperate northern hemisphere; some cultivated (Agrostemma, Arenaria, Cerastium, Dianthus, Gypsophila, Lychnis, Sagina, Saponaria, Silene, Vaccaria). Note: Apetalous Caryophyllaceae can also be keyed in Rabeler & Hartman 2005 FNANM 5:5--8.
eFlora Treatment Author: Ronald L. Hartman & Richard K. Rabeler, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: CerastiumView DescriptionDichotomous Key

Common Name: MOUSE-EAR CHICKWEED
Habit: Annual, perennial herb, erect to mat-forming; taproot or rhizomes present. Leaf: blade linear to ovate; vein 1; axillary leaf clusters generally 0. Inflorescence: terminal or axillary; flowers few to many, open to dense; pedicels 1--36+ mm. Flower: sepals (4)5, 3--12 mm, free, lanceolate to ovate, hairy to glandular-hairy, hairs generally not exceeding tip; petals 0 or (4)5, 2.5--15 mm, +- 2-lobed, white [purple tinged]; stamens (4,5)10; styles (4)5, 0.5--3.3 mm. Fruit: capsule, cylindric, often +- curved in upper 1/2; teeth (8)10, spreading to recurved. Seed: several to many, pale to red-brown.
Species In Genus: +- 180 species: worldwide, especially northern temperate. Etymology: (Greek: horn, from fruit shape)

Cerastium arvense L. subsp. strictum Gaudin
NATIVE
Habit: Perennial herb, generally not flowering 1st year, 5--20(30) cm, glandular-hairy above, hairs +- longer below. Stem: non-flowering (mat-forming) and flowering (+- erect). Leaf: on flower stem generally 8--25 mm, linear or lanceolate, +- glabrous or not; axillary leaf clusters present, especially below. Inflorescence: bract margins generally scarious in distal 1/4; pedicels in fruit 1--4 × sepals. Flower: parts 5; calyx 4.2--6(7) mm, glandular-hairy, rarely with hairs exceeding tip, scarious margin of outer sepals < 0.2 mm wide; petals 7.5--9 mm, 3--6 mm > sepals. Fruit: 7.5--11 mm. Seed: +- 1--1.2 mm. Chromosomes: 2n=36.
Ecology: Moist seeps, shaded areas, grassy, generally rocky or sandy slopes; Elevation: 600--1850 m. Bioregional Distribution: KR, c SNF, n&c SNH, SnFrB; Distribution Outside California: North America (except southeastern); South America, Europe. Flowering Time: Spring Note: Can be difficult to distinguish from Cerastium viride (see Morton).
Synonyms: Cerastium arvense var. strictum (Gaudin) W.D.J. Koch
Unabridged Note: 1 other subsp., in northeastern North America, native to western Europe.
eFlora Treatment Author: Ronald L. Hartman & Richard K. Rabeler
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Citation for this treatment: Ronald L. Hartman & Richard K. Rabeler 2016. Cerastium arvense subsp. strictum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=49810, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 05, 2016.


Cerastium arvense subsp. strictum
click for enlargement
© 2014 Steve Matson
Cerastium arvense subsp. strictum
click for enlargement
© 2013 Dana York
Cerastium arvense subsp. strictum
click for enlargement
© 2014 Steve Matson
Cerastium arvense subsp. strictum
click for enlargement
© 2015 Barry Breckling
Cerastium arvense subsp. strictum
click for enlargement
© 2015 Barry Breckling
Cerastium arvense subsp. strictum
click for enlargement
© 2013 Dana York

More photos of Cerastium arvense subsp. strictum in CalPhotos


Geographic subdivisions for Cerastium arvense subsp. strictum:
KR, c SNF, n&c SNH, SnFrB;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.