CPC Plant Profile: Budding Pondweed
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Plant Profile

Budding Pondweed (Potamogeton pusillus ssp. gemmiparus)

2/23/2018 Photo Credit: By N.L. Britton and A. Brown
  • Global Rank: T3 - Vulnerable
  • Legal Status: N/A
  • Family: Potamogetonaceae
  • State: CT, MA, ME, NH, QC, RI
  • Nature Serve ID: 151796
  • Date Inducted in National Collection: 12/07/2021

Potamogeton pusillis ssp. gemmiparus, also known as Potamogeton gemmiparus or budding pondweed, is an aquatic plant that grows completely submerged in lakes or slow-moving rivers. Budding pondweed has thread-like leaves that grow up to 2½ inches long. Flowers are formed on stalks and can be above or below the surface of the water. The fruit only contain a single seed and they are very small (less than 1/10th of an inch wide). Budding pond weed can be confused with Potamogeton pusillus and Potamogeton berchtoldii. Budding pondweed tends to have skinnier leaves than the two look-a-like species and it only have one leaf vein, whereas the other two have three or more leaf veins. (New England Wildflower Society, 2018; Wernerehl, 2015) Budding pondweed is only found in upper New England and Quebec, Canada. It is threatened by invasive aquatic species and the herbicides used to control them. As of 2000, is was considered vulnerable or critically imperiled in most of the states in which it occurs, as well as Quebec, and it is possibly extinct in New Hampshire. (NatureServe, 2018; New England Wildflower Society, 2018; USDA and NRCS, 2018; Wernerehl, 2015)

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Taxon Potamogeton pusillus ssp. gemmiparus
Authority (J.W. Robbins) R.R. Haynes & Hellq.
Family Potamogetonaceae
CPC Number 44908
ITIS 566075
Common Names small pondweed
Associated Scientific Names Potamogeton pusillus ssp. gemmiparus | Potamogeton berchtoldii subsp. gemmiparus | Potamogeton gemmiparus | Potamogeton pusillus var. gemmiparus
State Rank
State State Rank
Connecticut S1
Massachusetts S3S4
Maine SU
New Hampshire SH
Quebec S1
Rhode Island S1

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID

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