1997 IUCN red list of threatened plants (1997)

Bulletin of the Natural History Museum. Botany series - Natural History Museum (London, England) (The Natural History Museum, 1993)

Bulletin of the Natural History Museum. Botany series - Natural History Museum (London, England) (The Natural History Museum, 1993)

An environmental profile of the Black Sea Coast - Gillett, Harriet J. (WCMC, 1997)

New flora and botany of North America, or a supplemental flora, additional to all the botanical works on North America and the United States. Containing 1000 new or revised species - Rafinesque, C. S. (Constantine Samuel), 1783 -1840 ([Printed for the author and publisher], 1836)