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Vascular Plants of California
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Persicaria maculosa
LADY'S THUMB


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
Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
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)
eFlora Treatment Author: Mihai Costea
Persicaria maculosa Gray
NATURALIZED
Habit: Annual, rhizomes, stolons 0. Stem: prostrate to erect, 10--70(130) cm, glabrous or appressed-hairy. Leaf: ocrea 5--10(15) mm, cylindric, light-brown, margin truncate, ciliate, bristles 2--3.5(4.5) mm, surface glabrous or strigose, not gland-dotted; petiole 0--0.8 cm; blade (1)5--10(18) cm, (0.2)1--2.5(4) cm wide, lanceolate to narrowly ovate, glabrous or strigose, gland-dotted abaxially or not, often dark-blotched adaxially, base tapered or wedge-shaped, tip acute to acuminate. Inflorescence: axillary, terminal, +- erect, interrupted proximally or not, 10--45(60) mm, 7--12 mm wide; peduncle 10--50 mm, +- glabrous, glands 0; bractlets generally overlapped; pedicels ascending, 1--2.5 mm; flowers 4--13. Flower: perianth 2--3.5 mm, bell-shaped, +- enlarging, not gland-dotted, pink or rose, lobes 4--5, obovate, veins prominent, not anchor-shaped, tips obtuse to rounded; stamens 4--8, included, anthers yellow or pink; styles 2--3, fused basally. Fruit: included or exserted, 2--2.7 mm, (1.5) 1.8--2.2 mm wide, lens-shaped to 3-angled, brown-black to black, shiny, smooth. Chromosomes: 2n=44.
Ecology: Moist disturbed areas, fields; Elevation: < 1500 m. Bioregional Distribution: CA; Distribution Outside California: North America, native to Eurasia. Flowering Time: Jun--Nov Note: Probably of hybrid origin, with Persicaria lapathifolia as one parent.
Synonyms: Persicaria fusiformis (Greene) Greene; Polygonum fusiforme Greene; Polygonum persicaria L.; Polygonum puritanorum Fernald
Jepson eFlora Author: Mihai Costea
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Botanical illustration including Persicaria maculosa

botanical illustration including Persicaria maculosa

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Citation for this treatment: Mihai Costea 2012, Persicaria maculosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=82466, accessed on May 22, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on May 22, 2019.

Persicaria maculosa
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© 2008 Keir Morse
Persicaria maculosa
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© 2008 Keir Morse
Persicaria maculosa
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© 2004 Carol W. Witham
Persicaria maculosa
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© 2016 Keir Morse
Persicaria maculosa
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© 2008 Keir Morse
Persicaria maculosa
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© 2007 Neal Kramer

More photos of Persicaria maculosa in CalPhotos



Geographic subdivisions for Persicaria maculosa:
CA
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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.