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  • 1
    ISSN: 1573-5060
    Keywords: Colocasia esculenta ; Colocasia antiquorum ; cocoyam ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The taxonomy of edible Colocasia (Cocoyam) is confusing. The existence of one species, C. esculenta var. antiquorum or C. esculenta and C. antiquorum as two separate species is controversial. Nine high yielding Nigerian cultivars of cocoyam made up of members of the two taxa were grown under the same environmental conditions. As a preliminary investigation, 17 characters were monitored and recorded to help in the classification of the cultivars. Results showed that cocoyams can be grouped into two separate species. The qualities possessed by TCe 23, Nwine and Ukpon cultivars which include pink tuber skin, long or club shaped cormels and non-irritation in the throat when boiled and eaten, clearly distinguished them from those of Tce 15, 19, 27, 36, Ede-ofe and Kochuom.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 35 (1986), S. 733-739 
    ISSN: 1573-5060
    Keywords: Dioscorea cayenensis ; yellow yam ; Dioscorea rotundata ; white yam ; single linkage ; cluster analysis principal components analysis ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Two numerical taxonomic techniques, single linkage cluster analysis (SLCA) and principal components analysis (PCA) were used to study the relationship between Dioscorea cayenensis and D. rotundata cultivars. The study was prompted by the confusion in the taxonomy of the two taxa. Twenty-two cultivars (14 of D. rotundata and 8 of D. cayenensis) were collected and planted under the same environmental conditions for 3 successive years. Altogether, 76 characters, which include morphological, anatomical and ecological characters were observed and coded for analyses. Results from both methods agreed and showed that two groups of taxa exist. The discrimination between groups and description of differences between groups were more strongly marked from the PCA than in the SLCA.
    Type of Medium: Electronic Resource
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