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Cerastium
Family: Caryophyllaceae
Cerastium image
Max Licher
  • FNA
  • Gleason & Cronquist
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John K. Morton in Flora of North America (vol. 5)
Herbs, annual, winter annual, or perennial. Taproots slender, perennial taxa often rhizomatous, rooting at nodes. Stems ascending to erect or decumbent, simple or branched, terete. Leaves basally connate, petiolate (basal in some species) or sessile (cauline); blade 1-5-veined, linear or elliptic to broadly ovate, not succulent (except in C. bialynickii, C. regelii, and C. viride), apex acute to obtuse. Inflorescences terminal, open or congested cymes, or flowers solitary, axillary (racemosely arranged in C. axillare); bracts paired, foliaceous or reduced, herbaceous or often with scarious margins. Pedicels erect, sometimes reflexed or hooked at apex in fruit, or flowers sometimes subsessile (C. regelii). Flowers bisexual, occasionally unisexual and pistillate; perianth and androecium hypogynous or weakly perigynous; hypanthium minimal; sepals (4-)5, distinct, green (red-tipped in C. glomeratum and C. pumilum, often violet-tipped in C. alpinum, purple in C. bialynickii, turning pale orange-brown in fruit in C. texanum), elliptic to ovate, 3-12 mm, herbaceous, margins translucent to purplish, scarious, apex acute, acuminate, or obtuse, not hooded; petals (4-)5 or sometimes absent, white (purple tinged in C. pumilum and C. regelii), clawed, blade apex 2-fid 1/ 1/ 2 of length, notched, or emarginate; nectaries at base of filaments opposite sepals; stamens usually 10, sometimes 5 or 8, occasionally 4; filaments distinct, inserted at base of ovary; staminodes absent or 1-4 (via anther abortion), linear; styles (3-)5(-6), clavate to filiform, 0.5-2 mm, glabrous proximally; stigmas (3-)5(-6), subterminal to linear along adaxial surface of styles, roughened to papillate (30×). Capsules oblong or cylindric, usually ± curved, opening by 10, or occasionally 6 or 8, erect or spreading, convolute or revolute teeth, longer than sepals; carpophore absent. Seeds 15-150+, orange to brown, angular-obovate, often with abaxial groove, laterally compressed, papillate-tuberculate, marginal wing absent, appendage absent. x = [9-, 13, 15] 17, 18, 19.
Vascular plants of NE US and adjacent Canada
As in terminal cymes, or sometimes solitary; sep (4)5; pet (4)5, retuse to bifid or seldom entire, or occasionally wanting; stamens (4-)10; styles (3-)5; capsule usually surpassing the sep, cylindric, membranous, often curved, dehiscent by (6-)10 short apical teeth; seeds numerous, obovate-reniform, dorsally grooved, papillate-tuberculate; low annual or perennial herbs with rather small, opposite, exstipulate lvs. 100, widespread.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Cerastium aleuticum
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Cerastium alpinum
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Cerastium arcticum
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Cerastium arvense
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Cerastium axillare
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Cerastium beeringianum
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Cerastium brachypetalum
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Cerastium brachypodum
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Cerastium dichotomum
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Cerastium diffusum
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Cerastium dubium
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Cerastium eriophorum
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Cerastium fischerianum
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Cerastium fontanum
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Cerastium fuegianum
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Cerastium glomeratum
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Cerastium gorodkovianum
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Cerastium gracile
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Cerastium holosteoides
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Cerastium illyricum
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Cerastium latifolium
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Cerastium maximum
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Cerastium nutans
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Cerastium pumilum
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Cerastium regelii
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Cerastium semidecandrum
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Cerastium siculum
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Cerastium sordidum
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Cerastium texanum
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Cerastium tomentosum
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Cerastium velutinum
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Cerastium viride
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NSF NEON | Open Data to Understand our Ecosystems The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.