Note on the Variety Trimmeri of Potamogeton trichoides, Cham., found in England

Robert Caspary
1865 Journal of the Proceedings of the Linnean Society of London Botany  
doi:10.1111/j.1095-8312.1865.tb01093.x fatcat:xsyt3voxvjfjzk4hm6fzztgg2i