@article {Hillig:March 2005:0925-9864:161,
	author = "Hillig, Karl",
	title = "Genetic evidence for speciation in Cannabis (Cannabaceae)",
	journal = "Genetic Resources and Crop Evolution",
	volume = "52",
	year = "March 2005",
	abstract = "Sample populations of 157 <I>Cannabis</I> accessions of diverse geographic origin were surveyed for allozyme variation at 17 gene loci. The frequencies of 52 alleles were subjected to principal components analysis. A scatter plot revealed two major groups of accessions. The <I>sativa</I> gene pool includes fiber/seed landraces from Europe, Asia Minor, and Central Asia, and ruderal populations from Eastern Europe. The <I>indica</I> gene pool includes fiber/seed landraces from eastern Asia, narrow-leafleted drug strains from southern Asia, Africa, and Latin America, wide-leafleted drug strains from Afghanistan and Pakistan, and feral populations from India and Nepal. A third putative gene pool includes ruderal populations from Central Asia. None of the previous taxonomic concepts that were tested adequately circumscribe the <I>sativa</I> and <I>indica</I> gene pools. A polytypic concept of <I>Cannabis</I> is proposed, which recognizes three species, <I>C. sativa</I>, <I>C. indica</I> and <I>C. ruderalis</I>, and seven putative taxa.",
	pages = "161-180(20)",
	url = "http://www.ingentaconnect.com/content/klu/gres/2005/00000052/00000002/00004452"
	doi = "doi:10.1007/s10722-003-4452-y"
}