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Arenaria lanuginosa (Michx.) Rohrb.  
Family: Caryophyllaceae
Spreading Sandwort, more...sandwort (es: maguire)
[Arenaria megalantha, moreArenaria nemorosa , Stellaria laxa Muschl.]
Arenaria lanuginosa image
Max Licher
  • FNA
  • SW Field Guide
  • Gleason & Cronquist
  • Resources
Ronald L. Hartman, Richard K. Rabeler, Frederick H. Utech in Flora of North America (vol. 5)
Plants ± strongly perennial, pos-sibly blooming first year, not matted. Taproots filiform to moderately thickened; rhizomes often present, slender, 2-15+ cm. Stems 1-80+, erect or ascending to procumbent or prostrate to trailing, green, 5-60 cm; internodes terete to angular, 1/ 3-8+ times as long as leaves, dull, retrorsely pubescent throughout or in lines, hairs minute. Leaves usually connate basally, with scarious sheath 0.1-0.5 mm, occasionally petiolate (proximal leaves) or sessile; petiole 2-5 mm; blade 1-veined, vein prominent abaxially, linear-lanceolate to narrowly elliptic or oblanceolate, 3-35 × 2-14 mm, herbaceous, margins thickened, scarious, shiny, ciliate proximally or throughout, apex obtuse or acute to apiculate, often minutely pustulate, ciliate on margins and adaxial midrib; axillary leaf clusters absent. Inflorescences axillary, solitary flowers or in proliferating, mostly terminal, leafy, 1-80+-flowered cymes. Pedicels erect to ascending (often arcuately so), or straight to widely divergent, often hooked distally in fruit, 2-40 mm, retrorsely pubescent. Flowers: sepals green, 1-3-veined, 2 lateral veins 4-3/ 4 times as long as midvein, often appearing prominently keeled proximally, lanceolate to ovate (herbaceous portion oblong or lanceolate to ovate), 2-5 mm, to 5.5 mm in fruit, apex acute to acuminate, not pustulate, glabrous; petals narrowly spatulate to obovate, 1.5-6 mm, 2-1 5 times as long as sepals or absent, apex obtuse to rounded, petals sometimes absent. Capsules ± loosely to tightly enclosed by calyx, ovoid, 3-6 mm, 5-1 2 times as long as sepals. Seeds 8-35, black, suborbicular, slightly compressed, 0.7-0.8 mm, shiny, smooth. 2n = 40, 44.
FNA 2005, McDougall 1973
Duration: Perennial Nativity: Native Lifeform: Forb/Herb General: Small herb 5-60 cm tall, lax and spreading, sometimes erect and ascending, with up to 80 slender stems, internodes terete to angular, pubescence ascending in lines along the stems. Leaves: Basal leaves connate (fused together) with a thin sheath, proximal leaves petiolate or sessile, linear lanceolate, midvein prominent on the underside of the leaf, opposite, shiny and sometimes ciliate. Flowers: Axillary inflorescences, borne singly or in cymes, flowers white with 5 obovate petals, sepals bright green with 1-3 veins, lanceolate to ovate, ovary superior and evident at the throat of the flowers, stamens many, anthers white to light pink. Fruits: Ovoid capsules held within the calyx, seeds black. Ecology: Found in coniferous forests from 5,500-12,000 ft (1676- 3658 m); flowering May-September Notes: This small plant is easy to overlook, however, its small white flowers catch the eye, especially when the anthers are pink. The leaves can sometimes appear whorled from a distance, making the plant look like a Galium, but closer inspection will reveal the paired leaves, often sessile and clasping at the base. Ethnobotany: An infusion of the plant was used to treat colds, eye infection, pimples, and venereal disease, and a cold compress of the plant was placed on the forehead to treat headaches. Synonyms: Arenaria lanuginosa subsp. saxosa, Arenaria confusa, Arenaria lanuginosa var. cinerascens, Arenaria saxosa, Arenaria saxosa var. cinerascens, Arenaria saxosa var. mearnsii, Spergulastrum lanuginosum subsp. saxosum Editor: LCrumbacher, 2011 Etymology: Arenaria comes from the Latin arena, "sand," referring to the sandy habitats of many species, while lanuginosa means woolly or downy.
Vascular plants of NE US and adjacent Canada
Lax perennial; stem retrorsely puberulent, to 5 dm; lvs narrowly lance-elliptic or elliptic-oblanceolate, 15-30 נ2-8 mm, ±pustulate, ciliate at base; pedicels axillary, slender, mostly 1.5-4 cm, ascending to reflexed, puberulent; sep lanceolate, 3-4 mm, acute or acutish, 1-nerved, glabrous, often pustulate, sometimes ciliolate at base; pet minute or usually none; seed 0.6-0.8 mm, flattened, somewhat keeled dorsally, smooth, shining, black or dark reddish-black; 2n=44. Open woodlands and rocky places or damp thickets; se. Va. to Ark., s. to tropical Amer. Our plants are var. lanuginosa.

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.
Arenaria lanuginosa
Open Interactive Map
Arenaria lanuginosa image
Sue Carnahan
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Max Licher
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Sue Carnahan
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Sue Carnahan
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Max Licher
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Sue Carnahan
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Sue Carnahan
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Sue Carnahan
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Kirstin Phillips
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Kirstin Phillips
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Kirstin Phillips
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Sue Carnahan
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Kirstin Phillips
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Kirstin Phillips
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Kirstin Phillips
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Sue Carnahan
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David Thornburg
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David Thornburg
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David Thornburg
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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