Seeds: Ottelia alismoides; Photo by J. Scher, Federal Noxious Weed Disseminules of the US
Seed, embryo: Ottelia alismoides (A, seed; B, embryo in situ; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Seed, embryo: Ottelia alismoides (A, seed; B, embryo in situ; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Fruit: Elodea bifoliata; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seeds: Elodea bifoliata; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Fruit: Halophila decipiens; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seeds: Halophila decipiens; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seed: Hydrilla verticillata, cluster; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seed, embryo: Hydrilla verticillata (A, seed; B, longitudinal section, embryo indiscernible; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Seed, embryo: Hydrilla verticillata (A, seed; B, longitudinal section, embryo indiscernible; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Seed, embryo: Vallisneria spiralis (A, seed; B, embryo in situ; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Seed, embryo: Vallisneria spiralis (A, seed; B, embryo in situ; C, transection of seed); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Fruits: Lagerosiphon sp.; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Fruit: Thalassia hemprichii; Photo by R. Gibbons, USDA APHIS PPQ, Kirkbride et al. (2006)
Seed: Nechamandra alternifolia (A, seed; B, seed outline); Illustration by L.E. Chandler from Gunn and Ritchie (1988)
Seed: Nechamandra alternifolia (A, seed; B, seed outline); Illustration by L.E. Chandler from Gunn and Ritchie (1988)