Polygonum dentoceras

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Polygonum dentoceras
Poly myri Poly dent2.jpg
Polygonella myriophylla shown, synonym of Polygonum dentoceras Photo by Wayne Matchett, SpaceCoastWildflowers.com
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida – Dicotyledons
Order: Caryophyllales
Family: Polygonaceae
Genus: Polygonum
Species: P. dentoceras
Binomial name
Polygonum dentoceras
(Small) Horton
Poly myri dist.jpg
Natural range of Polygonum dentoceras from USDA NRCS Plants Database.

Common names: Sandlace, Small's jointweed

Taxonomic notes

Synonyms: Polygonella myriophylla (Small) Horton; Dentoceras myriophylla Small


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


It is endemic to the ridges of central Florida.[1]



It is found in the dry sands of Florida rosemary scrubs in central Florida.[2] It is a gap specialist and has allelopathic properties, specifically to grasses.[3]


Reproduces sexually and asexually.[4] Fruits and flowers all year.[1]

Seed bank and germination

It is an obligate seeder.[5]

Fire ecology

It is believed that P. dentoceras is not dependent on fire, however only depends on sufficient gaps.[4] It demonstrates allelopathic capabilities that may create suitable conditions and maintain enough bare sand needed. It does not resprout after fire, Weekley and Menges (2003) observed that two years postburn, P. dentoceras had not recolonized most plots. This is an obligate seeder and will recolonize from seeds after time.


The following Hymenoptera families and species were observed visiting flowers of Polygonum dentoceras at Archbold Biological Station (Deyrup 2015):

Halictidae: Lasioglossum placidensis

Leucospididae: Leucospis robertsoni

Sphecidae: Bembecinus nanus floridanus, Cerceris blakei, Tachytes pepticus

Vespidae: Leptochilus krombeini, Stenodynerus beameri

Conservation and management

There are fewer than 150 populations of P. dentoceras remaining on the Lake Wales Ridge. The ridge is quickly being converted to urban and agricultural areas. This species requires a large-scale natural disturbance, such as fire, to maintain gaps in the scrub to allow for germination.[1]



Cultivation and restoration

Photo Gallery

References and notes

Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.
  1. 1.0 1.1 1.2 [[1]] Florida Natural Areas Inventory. Accessed: February 24, 2016
  2. Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: February 2016. Collectors: L.J. Brass, D. Burch, George R. Cooley, Chas. C. Deam, Robert K. Godfrey, O. Lakela, Robert Kral, S.W. Leonard, John K. Small, D.B. Ward, Kenneth A. Wilson, Carrol E. Wood. States and Counties: Florida: DeSoto, Highlands, Polk. Compiled by Tall Timbers Research Station and Land Conservancy.
  3. Weidenhamer, J. D., D. C. Hartnett, et al. (1989). "Density-Dependent Phytotoxicity: Distinguishing Resource Competition and Allelopathic Interference in Plants." Journal of Applied Ecology 26(2): 613-624.
  4. 4.0 4.1 [[2]]Accessed: February 24, 2016
  5. 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.