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)
2/23/2018 Photo Credit: By N.L. Britton and A. Brown
CPC secures rare plants for future generations by coordinating on-the-ground conservation and training the next generation of plant conservation professionals. Donate today to help save rare plants from extinction.