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Polygonum
Family: Polygonaceae
Polygonum image
Joseph M. DiTomaso,  
  • FNA
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Mihai Costea, François J. Tardif, Harold R. Hinds+ in Flora of North America (vol. 5)
Herbs, shrubs, or subshrubs, annual (perennial in P. striatulum), homophyllous or heterophyllous, sometimes heterocarpic; roots fibrous or woody. Stems prostrate to erect, glabrous, smooth or sometimes papillous-scabridulous. Leaves cauline, alternate (opposite in P. humifusum), petiolate or sessile; ocrea with distal part persistent, often hyaline, white or silvery, 2-lobed, chartaceous, glabrous, disintegrating into fibers, or disintegrating completely; petiole base articulated with ocrea or not; blade linear, lanceolate, elliptic, ovate, or subround, margins entire. Inflorescences axillary or axillary and terminal, spikelike, or flowers solitary; peduncle absent. Pedicels present or absent. Flowers bisexual, 1-7(-10) per ocreate fascicle, base not stipelike; perianth nonaccrescent, white or greenish white to pink, campanulate to urceolate, glabrous; tepals 5, connate 3-70% of their length, petaloid or sepaloid, monomorphic or, rarely, dimorphic, the inner usually flat, the outer flat or sometimes keeled and cucullate distally, sometimes of different length than the inner; stamens 3-8 (some may be reduced to staminodes); filaments distinct, free or adnate to perianth tube, glabrous; anthers whitish yellow, pink to purple or orange-pink, elliptic to oblong; styles (2-)3, mostly spreading, distinct or connate proximally; stigmas 2-3, capitate. Achenes included or exserted, yellow-green, brown, or black, unwinged, (2-)3-gonous, glabrous. Seeds: embryo curved. x = 10.
Vascular plants of NE US and adjacent Canada
Fls perfect or unisexual; pedicels jointed at or near the summit; tep (4)5(6), connate below; stamens 3-8; ovary flattened or trigonous, with 2-3 minute, usually capitate stigmas, the styles usually short or obsolete, separate or united; fr a lenticular or trigonous achene, wholly or in large part enclosed by the persistent perianth; embryo at one angle of the achene; annual or perennial herbs (seldom shrubs), commonly with well developed ocreae; fls borne in axillary clusters or terminal (often also axillary) spike-like racemes, or in terminal heads or panicles. Most of the several sections have been taken by some authors as distinct genera. Our spp. mostly flower from early or midsummer into fall. 200, widespread, mainly temp.

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.
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Species within inventory project: || << 1 - 50 taxa >>
Aconogonon davisiae
Image of Aconogonon davisiae
Aconogonum smallii
Image of Aconogonum smallii
Bistorta bistortoides
Image of Bistorta bistortoides
Bistorta vivipara
Image of Bistorta vivipara
Coccoloba uvifera
Image of Coccoloba uvifera
Fagopyrum esculentum
Image of Fagopyrum esculentum
Fallopia baldschuanica
Image of Fallopia baldschuanica
Fallopia cilinodis
Image of Fallopia cilinodis
Fallopia convolvulus
Image of Fallopia convolvulus
Fallopia dumetorum
Image of Fallopia dumetorum
Fallopia scandens
Image of Fallopia scandens
Persicaria amphibia
Image of Persicaria amphibia
Persicaria amplexicaulis
Image of Persicaria amplexicaulis
Persicaria arifolia
Image of Persicaria arifolia
Persicaria bicornis
Image of Persicaria bicornis
Persicaria careyi
Image of Persicaria careyi
Persicaria hirsuta
Image of Persicaria hirsuta
Persicaria hydropiper
Image of Persicaria hydropiper
Persicaria hydropiperoides
Image of Persicaria hydropiperoides
Persicaria lapathifolia
Image of Persicaria lapathifolia
Persicaria laxmannii
Image of Persicaria laxmannii
Persicaria longiseta
Image of Persicaria longiseta
Persicaria maculata
Image of Persicaria maculata
Persicaria maculosa
Image of Persicaria maculosa
Persicaria meisneriana
Image of Persicaria meisneriana
Persicaria orientalis
Image of Persicaria orientalis
Persicaria pensylvanica
Image of Persicaria pensylvanica
Persicaria punctata
Image of Persicaria punctata
Persicaria robustior
Image of Persicaria robustior
Persicaria sagittata
Image of Persicaria sagittata
Persicaria virginiana
Image of Persicaria virginiana
Polygonella gracilis
Image of Polygonella gracilis
Polygonella macrophylla
Image of Polygonella macrophylla
Polygonella parksii
Image of Polygonella parksii
Polygonum achoreum
Image of Polygonum achoreum
Polygonum acre
Image of Polygonum acre
Polygonum acuminatum
Image of Polygonum acuminatum
Polygonum affine
Image of Polygonum affine
Polygonum alaskanum
Image of Polygonum alaskanum
Polygonum alatum
Image of Polygonum alatum
Polygonum alpinum
Image of Polygonum alpinum
Polygonum americanum
Image of Polygonum americanum
Polygonum arenarium
Image of Polygonum arenarium
Polygonum arenastrum
Image of Polygonum arenastrum
Polygonum argyrocoleon
Image of Polygonum argyrocoleon
Polygonum articulatum
Image of Polygonum articulatum
Polygonum austiniae
Image of Polygonum austiniae
Polygonum aviculare
Image of Polygonum aviculare
Polygonum baldschuanicum
Image of Polygonum baldschuanicum
Polygonum barbatum
Image of Polygonum barbatum
The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)