You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Numerical Taxonomic Analysis of Cannabis with Special Reference to Species Delimitation
Ernest Small, Perry Y. Jui and L. P. Lefkovitch
Vol. 1, No. 1 (Spring, 1976), pp. 67-84
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2418840
Page Count: 18
You can always find the topics here!Topics: Plants, Cannabis, Plant morphology, Botany, Achenes, Chemicals, Numerical taxonomy, Stems, T tests, Biological taxonomies
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Two thousand five hundred plants, representing 232 diverse populations of Cannabis, were grown under standard conditions in a garden, scored for 47 attributes, and the data used in a numerical taxonomic study of variation. Groups of interest included "nonintoxicant" and "semi-intoxicant" populations (collectively referable to C. sativa), "intoxicant" populations (sometimes called C. indica), fiber and oil cultivars (referable to C. sativa), "wild" populations (sometimes called C. ruderalis), and plants either containing or not containing cannabigerol monomethyl ether. Clustering methodology revealed only a limited tendency for the populations to separate into the above groupings. However, canonical analysis (equally weighted multiple discriminant analysis) of morphological characteristics only proved highly successful in delineating the groups. The analysis resulting from the comparison of wild and cultivated populations when applied to a large sample of populations failed to suggest two discrete groupings, and it is consequently concluded that wild and cultivated populations intergrade so greatly as to preclude recognition of wild plants as a separate species (the so-called C. ruderalis). Those morphological characteristics that successfully distinguish intoxicant populations from other populations in material raised under standardized garden conditions were sufficiently variable to suggest that the intoxicant potential of plants collected in nature cannot be reliably distinguished by morphology; consequently it is judged that there are no grounds for distinguishing intoxicant plants (the so-called C. indica) as a separate species. It is concluded that all plants of Cannabis are assignable to one species, C. sativa.
Systematic Botany © 1976 American Society of Plant Taxonomists