Polygonum spp.
Family: Polygonaceae
Polygonum image
Anthony Mendoza  
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.
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.
Image of Polygonum alaskanum
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Image of Polygonum articulatum
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Image of Polygonum bungeanum
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Polygonum
Image of Polygonum coarctatum
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Image of Polygonum cognatum
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Polygonum
Image of Polygonum corrigioloides
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Image of Polygonum dissitiflorum
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Image of Polygonum emersum
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Image of Polygonum fimbriatum
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Image of Polygonum greenei
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Image of Polygonum herniarioides
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Image of Polygonum marinense
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Image of Polygonum microcephalum
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Image of Polygonum muhlenbergii
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Image of Polygonum nepalense
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Polygonum
Image of Polygonum oxyspermum
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Image of Polygonum paronychioides
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Image of Polygonum plumosum
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Image of Polygonum polygamum
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Image of Polygonum polymorphum
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Image of Polygonum portoricense
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Image of Polygonum posumbu
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Image of Polygonum praetermissum
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Image of Polygonum pringlei
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Image of Polygonum psychrophilum
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Polygonum
Image of Polygonum rubescens
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Polygonum
Image of Polygonum songaricum
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Image of Polygonum thunbergii
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Polygonum
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Polygonum
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Polygonum
Image of Polygonum vagans
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Image of Polygonum zuccarinii
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