World Checklist of Selected Plant Families (WCSP)

Pycnanthemum virginianum (L.) T.Durand & B.D.Jacks. ex B.L.Rob. & Fernald in A.Gray, Manual, ed. 7: 707 (1908).

Here you can find additional information about this plant.

Images:	Google Image Search — searches Google images for this accepted name.
General:	ePIC — searches Kew resources. Wikispecies (Wikimedia foundation) — searches Wikispecies, a free species directory.
Specimens, distribution and conservation:	Herbarium Catalogue — searches Kew's specimen records and digital images currently available online. GBIF — Global Biodiversity Information Facility, contains primarily specimen and type information. Tropicos — searches the Missouri Botanical Garden research data, particularly specimen and type information.
Descriptions and use:	Biodiversity Heritage Library — accesses protologues and descriptions.
Molecular, chemical and DNA:	NCBI — US National Library of Medicine. GenBank at NCBI, National Center for Biotechnology Information — accesses genetic sequence data.
Reference:	IPNI — is a database of the names and associated bibliographical details of seed plants, ferns and fern allies. A collaborative project between Kew, Harvard and CSIRO (includes Index Kewensis compiled since 1883). EOL, Encyclopedia of Life. Catalogue of Life 2010 Annual Checklist.