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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 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 30, 2016.


Cerastium arvense subsp. strictum
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© 2014 Steve Matson
Cerastium arvense subsp. strictum
click for enlargement
© 2014 Steve Matson
Cerastium arvense subsp. strictum
click for enlargement
© 2009 Barry Breckling
Cerastium arvense subsp. strictum
click for enlargement
© 2014 Steve Matson
Cerastium arvense subsp. strictum
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© 2013 Dana York
Cerastium arvense subsp. strictum
click for enlargement
© 2014 Steve Matson

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. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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.