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3. problems of class. -cont.
Actually possible to subdivide cultivars into two large
groups, using morphological chars, as follows:
A. roots dark brown, rough surfaced, stems brown, yellow, or red
B. roots light tan, smooth surfaced, stems gray or silver-gray
These, unfortunately have little correlation with other
obvious characters, such as branching pattern, and have
no correlation with the variable HCN content.
4. Sampling techniques, and problems of classification.
1. Lack of understanding of biology of genus, and its methods
of pollination have caused explosion in spp. names.
2. Inadequate herbarium specimens memmix, without sampling
of variation on one plant has led to confusion.
3. Needs in sampling--populations, and how to get them--for
cultivars, fairly simple, since most expt. sta. have
a local collection. For wild spp., need not only
to take specimens representing variability, but photos,
and best yet, bring into cultivation.
Work in Jamaica at the experiment stations.
4. Nomenclatural problems--the type method has serious flaws
in cultivated plants--impossible to designate an
appropriate single sheet, or even group of sheets, which
indicated the species. Furthermore, subdivisions of
species, as presently set up by Int. Rules Nomencl. for
cult. plants is not realistic when dealing with hybrid
populations.