Cerastium cerastoides

(Linnaeus) Britton

Mem. Torrey Bot. Club 5: 150. 1894.

Common names: Starwort mouse-ear chickweed céraiste à trois styles
Illustrated
Basionym: Stellaria cerastoides Linnaeus Sp. Pl. 1: 422. 1753
Synonyms: Arenaria trigyna (Villars) Shinners Cerastium lapponicum Crantz Cerastium trigynum Villars Dichodon cerastoides (Linnaeus) Reichenbach Provencheria cerastoides (Linnaeus) B. Boivin
Treatment appears in FNA Volume 5. Treatment on page 84. Mentioned on page 74, 76.

Plants perennial, mat-forming, rhizomatous. Stems creeping, much-branched, rooting, glabrous except for line of small hairs down each internode; flowering shoots decumbent or ascending, 5–10 cm; nonflowering shoots prostrate, 5–15 cm; small axillary tufts of leaves usually absent. Leaves sessile, tending to marcescent, somewhat succulent; blade elliptic-oblong or linear-lanceolate, 2–12 × 1–3 mm, apex obtuse, rarely acute, glabrous, sometimes ciliate at base. Inflorescences lax, 1–3-flowered terminal cymes; bracts lanceolate, 2–5 mm, glabrous or ciliate. Pedicels becoming curved, slender, 5–35 mm, equaling or exceeding sepals, glandular-puberulent. Flowers: sepals narrowly lanceolate, 4–5 mm, margins narrow, midrib present, apex obtuse, glandular-pubescent towards base; petals 5–8 mm, 1–1.5 times as long as sepals, apex deeply 2-fid; stamens 10; styles 3 (–6). Capsules ovoid-conic, oblong after dehiscence, straight, 7–10 mm, 1.5–2 times as long as sepals; teeth 6 (–12), erect to spreading, margins convolute. Seeds brown, 0.5 mm diam., shallowly rugose; testa not inflated. 2n = 38.


Phenology: Flowering summer.
Habitat: Wet, arctic areas, alpine rills, alpine and arctic snowbeds
Elevation: 0-800 m

Distribution

V5 170-distribution-map.gif

Greenland, Nfld. and Labr., Nunavut, Que., Europe, amphi-Atlantic

Discussion

Cerastium cerastoides is an unusual member of the genus because it normally has only three styles and a straight, six-toothed capsule, rather than a curved capsule as in most of the other species. The blunt sepals help to distinguish this species from C. arvense subsp. strictum, with which it is most likely to be confused. The epithet of this species is often misspelled “cerastioides.”

Selected References

None.

Lower Taxa

None.

"-1.5timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Cerastium cerastoides"
perigynous +  and hypogynous +
glandular-pubescent +  and glabrous +
John K. Morton +
(Linnaeus) Britton +
Stellaria cerastoides +
elliptic to broadly ovate +  and linear +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
linear-lanceolate +  and elliptic-oblong +
1mm;3mm +
often +  and herbaceous +
ciliate +  and glabrous +
lanceolate +
reduced +
herbaceous +  and scarious +
1.5-2 times as long as sepals +
8 +  and 6 +
oblong;ovoid-conic +
Starwort mouse-ear chickweed +  and céraiste à trois styles +
dish--shaped +
expanded +
Greenland +, Nfld. and Labr. +, Nunavut +, Que. +, Europe +  and amphi-Atlantic +
0-800 m +
straight +  and curved +
central +  and peripheral +
pistillate +  and subsessile +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Wet, arctic areas, alpine rills, alpine and arctic snowbeds +
disc--shaped +  and dish +
marcescent +
connate +
succulent +
translucent +  and purplish +
swollen +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
reflexed;erect +
glandular-puberulent +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
exceeding sepals +  and equaling +
perigynous +  and hypogynous +
fugacious +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering summer. +
Mem. Torrey Bot. Club +
0.5 cm5 mm <br />0.005 m <br /> (?) +
compressed +  and angular-obovate +
persistent +
distinct +
lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
ascending +  and decumbent +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Illustrated +
rooting +  and much-branched +
ascending;erect or decumbent +
subterminal +
[30 +  and 5 +
roughened +  and papillate +
distinct +
clavate +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Arenaria trigyna +, Cerastium lapponicum +, Cerastium trigynum +, Dichodon cerastoides +  and Provencheria cerastoides +
rooting +  and rhizomatous +
Cerastium cerastoides +
Cerastium +
species +
not inflated +
erect;spreading +
divided +
10 +  and 8 +
plant +  and mat-forming +
pubescence of simple hairs or stalked glands +  and glabrous +
19 +, 18 +, 17 +, 15] +, 13 +  and [9 +