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 be 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.

... more about "Cerastium cerastoides"
John K. Morton +
(Linnaeus) Britton +
Stellaria cerastoides +
Starwort mouse-ear chickweed +  and céraiste à trois styles +
Greenland +, Nfld. and Labr. +, Nunavut +, Que. +, Europe +  and amphi-Atlantic. +
0-800 m +
Wet, arctic areas, alpine rills, alpine and arctic snowbeds +
Flowering summer. +
Mem. Torrey Bot. Club +
Illustrated +
Arenaria trigyna +, Cerastium lapponicum +, Cerastium trigynum +, Dichodon cerastoides +  and Provencheria cerastoides +
Cerastium cerastoides +
Cerastium +
species +