Fruits: Zannichellia palustris; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seeds: Zannichellia palustris; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Fruits: Potamogeton epihydrus; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Fruit, seed: Potamogeton epihydrus, cross sectioned fruit with seed; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Fruit, seed: Potamogeton epihydrus, cross sectioned fruit with seed; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Embryo: Lepilaena cylindrocarpa; Illustration by K. Parker, Kirkbride et al. (2006)