Smooth Knotweed
Persicaria glabra (Willdenow) M. Gomez
Smooth Knotweed: https://marylandbiodiversity.com/species/3545
Synonyms
Persicaria densiflora  Persicaria portoricensis  Polygonum densiflorum  Polygonum glabrum  Polygonum portoricense 
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14 Records

Status

Smooth Knotweed may be found in local floras as either Persicaria glabra or Persicaria densiflora. Some authors consider these synonyms (e.g., Knapp and Naczi 2021) while others separate the two species and recognize Persicaria glabra as an Old World species and Persicaria densiflora as a New World species (e.g., Weakley 2022). Consequently, Weakley (2022) prefers Persicaria densiflora for the species in the Southeast and Maryland.

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Source: Wikipedia

Persicaria glabra
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Persicaria
Species:
P. glabra
Binomial name
Persicaria glabra
(Willd.)M.Gómez
Synonyms
  • Persicaria densiflora

Persicaria glabra, also known as denseflower knotweed, is a species of flowering plant native to North America and Eurasia.[1]

Description

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It is similar in appearance to P. longiseta and P. lapathifolia. The plant is a medium-sized annual herb with red, swollen joints and lanceolate leaves. The inflorescence is a dense raceme of small pink or white flowers, the fruit a flattened black nut.

References

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  1. ^ Kim, Sang‐Tae; Donoghue, Michael J. (1 September 2008). "Incongruence between cpDNA and nrITS trees indicates extensive hybridization within Eupersicaria (Polygonaceae)". American Journal of Botany. 95 (9): 1122–1135. doi:10.3732/ajb.0700008. ISSN 0002-9122.
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