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Montana Field Guide

Montana Field Guides

Snow-in-summer - Cerastium tomentosum

Non-native Species

Global Rank: GNR
State Rank: SNA
C-value: 1

Agency Status


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General Description
Rhizomatous mat-forming perennials with dense white covering of hairs; flowering stems erect, to 40 cm tall. Leaves 10-60 mm long, 2-8 mm wide. Inflorescence of 3-13-flowered cymes. Pedicels 10-40 mm long, ascending and straight. Flowers 12-20 mm diameter; sepals 5-7 mm, margins narrow and often scarious; petals 10-18 mm, 2-2.5x length of sepals, apex bifid; stamens 10; styles 5. Capsules 10-15 mm, slightly curved, up to 2x length of sepals; teeth 10, erect, margins convolute (adapted from J. K. Morton, 2005, in Flora N. America, Vol. 5).

Range Comments
Scattered occurences from WA to eastern Canada and south to VA; native to southeastrern Europe(Kartesz in prep. 2012; J,K. Morton, 2005, in Flora North America, Vol. 5). Used ornamentally as a ground cover.

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus pensylvanicus (Colla and Dumesh 2010).


  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141: 39-68.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Snow-in-summer — Cerastium tomentosum.  Montana Field Guide.  .  Retrieved on , from