Polygonum nesomii

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Polygonum nesomii
Poly robu.jpg
Synonym Polygonella robusta shown, Photo by Shirley Denton (Copyrighted, use by photographer’s permission only), Nature Photography by Shirley Denton
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida – Dicotyledons
Order: Caryophyllales
Family: Polygonaceae
Genus: Polygonella
Species: P. nesomii
Binomial name
Polygonum nesomii
(Small) G.L. Nesom & V.M. Bates
Poly robu dist.jpg
Natural range of Polygonum nesomii from USDA NRCS Plants Database.

Common name: Largeflower jointweed

Taxonomic notes

Synonyms: Polygonella robusta (Small) G.L. Nesom & Bates; Polygonella fimbriata (Elliott) Horton var. robusta (Small) Horton; Thysanella robusta Small


A description of Polygonum nesomii is provided in The Flora of North America.


P. nesomii can be found in sandy habitat throughout Florida.[1]



In the Coastal Plain in Florida, P. robusta can occur in sandy old fields, Florida rosemary scrubs, sand dunes, and xeric oak/saw palmetto scrubs.[2] Associated species include saw palmetto and scrub oaks.


The flowers range from light pink to deep pink with the colors changing as the flowers mature and age, eventually turning rusty orange.[3] Blooms throughout summer and fall.[4]

Seed bank and germination

Lindon and Menges (2008) found that germination rates under smoke was less than without smoke.

Germination rates are negatively affected by the allelopathic chemicals leached from the Florida rosemary.[5]

Fire ecology

P. nesomii is an obligate seeder. Weekley and Menges (2003) found that two years post fire, there were individuals established in new areas.


The following Hymenoptera families and species were observed visiting flowers of Polygonella robusta at Archbold Biological Station: [6]

Apidae: Apis mellifera, Bombus impatiens

Colletidae: Colletes mandibularis, Hylaeus confluens

Halictidae: Augochlorella aurata, Augochloropsis anonyma, A. sumptuosa, Lasioglossum miniatulus, L. nymphalis, L. placidensis, Sphecodes heraclei

Leucospididae: Leucospis robertsoni, L. slossonae

Megachilidae: Anthidiellum perplexum, Coelioxys octodentata, C. sayi, Megachile albitarsis

Pompilidae: Anoplius marginalis, Episyron conterminus posterus, Paracyphonyx funereus

Sphecidae: Bembix sayi, Bicyrtes capnoptera, Cerceris flavofasciata floridensis, Ectemnius rufipes ais, Isodontia exornata, Larra bicolor, Oxybelus emarginatus, O. laetus fulvipes, Philanthus politus, P. ventilabris, Tachysphex similis, Tachytes grisselli, T. validus

Vespidae: Eumenes fraternus, E. smithii, Euodynerus boscii boharti, Monobia quadridens, Pachodynerus erynnis, Parancistrocerus salcularis rufulus, Polistes bellicosus, P. dorsalis hunteri, Pseudodynerus quadrisectus, Stenodynerus beameri, S. fundatiformis, S. histrionalis rufustus, S. lineatifrons, S. oculeus, S. pulvinatus surrufus, Zethus slossonae

Conservation and management

Cultivation and restoration

Photo Gallery

References and notes

Lindon, H. L. and E. Menges (2008). "Scientific Note: Effects of Smoke on Seed Germination of Twenty Species of Fire-Prone Habitats in Florida." Castanea 73(2): 106-110.

Weekley, C. W. and E. S. Menges (2003). "Species and Vegetation Responses to Prescribed Fire in a Long-Unburned, Endemic-Rich Lake Wales Ridge Scrub." The Journal of the Torrey Botanical Society 130(4): 265-282.
  1. Satya, M.-W., E. S. Menges, et al. (2005). "Microhabitat Distribution of Two Florida Scrub Endemic Plants in Comparison to Their Habitat-Generalist Congeners." American Journal of Botany 92(3): 411-421.
  2. Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: November 2015. Collectors: K. Godfrey, Robert L. Lazor, Julie Neel, Cecil R. Slaughter. States and Counties: Florida: Franklin, Madison, Osceola, Wakulla. Compiled by Tall Timbers Research Station and Land Conservancy.
  3. [[1]]
  4. [[2]]Floridata. Accessed: February 25, 2016
  5. Hewitt, R. E. and E. S. Menges (2008). "Allelopathic Effects of Ceratiola ericoides (Empetraceae) on Germination and Survival of Six Florida Scrub Species." Plant Ecology 198(1): 47-59
  6. Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.