A preserved Japanese knotweed specimen at Pixie Williams' home.
In a bid to protect Maine lakes, Pixie Williams, above, and other Lake Stewards of Maine volunteers are compiling a teaching archive of samples of invasive and native plant species – the Pixie WIlliams Herbarium.
A specimen in the process of being archived at Pixie Williams' home.
Williams points out a carefully preserved sample of whorled water-milfoil. Specimens are dried, pressed and meticulously glued to acid-free paper, which helps illuminate plant details.
A Chinese Mystery Snail sits among the herbarium samples at Pixie Williams' home. Though native to Asia, the snail has established itself in North America.
A sample of Japanese knotweed. Williams is working on more specimens for the herbarium at her home in Topsham.
Source 
