Taxonomic analysis of morphological characters of large-flowered chrysanthemum cultivars

Chrysanthemum has abundant variation among its cultivars. There are various classification systems according to different criteria and the most valuable characters for their classification have not as yet been found. We collected and analyzed 57 morphological characters from 400 chrysanthemum cultivars which were chosen on the basis of statistical sampling principles. Then 22 stable characters were selected through a uniformity test and R cluster analysis. A principal component analysis showed that the number of ray florets，floret length，height from attachment point of involucral bracts to the top of flower head and floret type were the most important variables in the first principal component. The second principal component contained the surface and back color of outer florets，followed by the diameter and length of tubular florets in the third principal component. The fourth principal component included some characters about the stipule. These results indicate that the flower characters are stable and play a key role in grouping the cultivars of chrysanthemum，the characters of the stipule display a certain stability and may be a suitable supplement for classification，while leaf characters are variable and may act as less important criteria. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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