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Persicaria hydropiper
WATERPEPPER

Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key

Common Name: BUCKWHEAT FAMILY
Habit: Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or +- fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1--200 per node; perianth parts 2--6, generally in 2 whorls, free or basally fused, generally petal-like, often +- concave adaxially, often darker at midvein, often turning +- red or +- brown in age; stamens [1]3 or 6--9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1--3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous.
Genera In Family: 48 genera, +- 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. Note: Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1--many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed +- presently), therefore not treated.
eFlora Treatment Author: Mihai Costea, except as noted
Genus: PersicariaView DescriptionDichotomous Key

Common Name: SMARTWEED
Habit: Annual, perennial herb, rhizomed or stoloned. Stem: prostrate to erect, ribbed or +- so or not, glabrous or hairy, generally with adventitious roots. Leaf: cauline, alternate, petioled or not; ocrea papery, rarely +- leaf-like, opaque, persistent or disintegrating, glabrous to variously hairy; blade lanceolate or ovate to hastate or sagittate, entire. Inflorescence: axillary, terminal, generally spike-like; flowers 1--14; peduncle present, pedicels present [or 0]. Flower: bisexual or functionally +- unisexual, base not stalk-like; perianth not or +- enlarging, bell-shaped (urn-shaped, rotate), glabrous, gland-dotted or not, green-white, white, pink, or red; perianth parts 4--5, fused 1/4--2/3, outer 2 > inner 2 or 3; stamens 5--8, filaments free, cylindric, thread-like, glabrous, outer fused to perianth tube or not, anthers elliptic to ovate, yellow, pink, or red; styles 2--3, erect to reflexed, free or fused, stigmas head-like. Fruit: included or exserted, brown or dark-brown to black, not winged, discoid, lens-shaped, or 3-angled. Seed: embryo curved.
Species In Genus: +- 100 species: +- worldwide. Etymology: (Latin: persica, peach, aria, pertaining to; from resemblance of leaves of some species to those of peach)

Persicaria hydropiper (L.) Delarbre
NATURALIZED
Habit: Annual, rhizomes, stolons 0. Stem: ascending to erect, 20--60(100) cm, gland-dotted. Leaf: ocrea 8--15 mm, brown, cylindric or funnel-shaped, margins truncate, ciliate, bristles 1--4 mm, surface glabrous or strigose, generally gland-dotted; petiole 0--0.8 cm; blade (1.5)4--10(15) cm, 0.4--2.5 cm wide, lanceolate to narrowly diamond-shaped, glabrous or scabrous on midveins, +- gland-dotted, adaxial dark blotch 0, base wedge-shaped, tip acute to acuminate. Inflorescence: axillary, terminal, erect or nodding, interrupted or not distally, 30--180 mm, 5--9 mm wide; peduncle (0)10--50 mm, glabrous, gland-dotted; bractlets not overlapped; pedicels ascending, 1--3 mm; flowers 1--3(5). Flower: perianth 2--3.5 mm, +- bell-shaped, gland-dotted, green-white or pink, lobes 4--5, obovate, margins +- red, veins +- prominent, not anchor-shaped, tips obtuse to rounded; stamens 6--8, included, anthers pink or red; styles 2--3, fused basally. Fruit: included or exserted, 2--3 mm, 1.5--2 mm wide, lens-shaped or 3-angled, brown-black, dull, minutely rough. Chromosomes: 2n=20.
Ecology: Shores of lakes, ponds, riverbanks, forested wetlands, pastures, disturbed ground; Elevation: < 1500 m. Bioregional Distribution: n&c CA-FP; Distribution Outside California: to northern and eastern North America, also Asia, Africa, Australia; native to Europe. Flowering Time: May--Dec
Synonyms: Polygonum hydropiper L.
eFlora Treatment Author: Mihai Costea
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Previous taxon: Persicaria capitata
Next taxon: Persicaria hydropiperoides

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Citation for this treatment: Mihai Costea 2016. Persicaria hydropiper, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=37286, accessed on December 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 03, 2016.


Persicaria hydropiperoides
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© 2016 Keir Morse
Persicaria hydropiperoides
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© 2016 Keir Morse
Persicaria hydropiperoides
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© 2005 George W. Hartwell
Persicaria hydropiperoides
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© 2015 Barry Breckling
Persicaria hydropiperoides
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© 2015 Barry Breckling
Persicaria hydropiperoides
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© 2016 Keir Morse

More photos of Persicaria hydropiper in CalPhotos


Geographic subdivisions for Persicaria hydropiper:
n&c CA-FP;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
READ ABOUT YELLOW FLAGS
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.