He considered the genus to be monotypic, having just a single species that he named Cannabis sativa L. stands for Linnaeus, and indicates the authority who first named the species). Cannabis sativa cultivars are used for fibers due to their long stems; Sativa varieties may grow more than six metres tall.
Various compounds, including hashish and hash oil, are extracted from the plant. This classification was based on several factors including interfertility, chromosome uniformity, chemotype, and numerical analysis of phenotypic characters. According to Schultes' and Anderson's descriptions, C.
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As is common in serrated leaves, each serration has a central vein extending to its tip. The authors hypothesized that the two subspecies diverged primarily as a result of human selection; C. sativa was presumably selected for traits that enhance fiber or seed production, whereas C. Molecular analytical techniques developed in the late 20th century are being applied to questions of taxonomic classification. de Meijer and coworkers described some of their RAPD studies as showing an "extremely high" degree of genetic polymorphism between and within populations, suggesting a high degree of potential variation for selection, even in heavily selected hemp cultivars. In his doctoral dissertation published the same year, Hillig stated that principal components analysis of phenotypic (morphological) traits failed to differentiate the putative species, but that canonical variates analysis resulted in a high degree of discrimination of the putative species and infraspecific taxa.
However, the serration vein originates from lower down the central vein of the leaflet, typically opposite to the position of, not the first notch down, but the next notch. This has resulted in many reclassifications based on evolutionary systematics. They also commented that these analyses confirm the continuity of the Cannabis gene pool throughout the studied accessions, and provide further confirmation that the genus consists of a single species, although theirs was not a systematic study per se. Hillig, a graduate student in the laboratory of long-time Cannabis researcher Paul G. Another paper in the series on chemotaxonomic variation in the terpenoid content of the essential oil of Cannabis revealed that several wide-leaflet drug strains in the collection had relatively high levels of certain sesquiterpene alcohols, including guaiol and isomers of eudesmol, that set them apart from the other putative taxa. He also concluded there is little support to treat C. sativa at this time, but more research on wild and weedy populations is needed because they were underrepresented in their collection.