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Plant Diversity and Resources

Acta Phytotaxonomica Sinica

Volume 31 Issue 3, Pages 252C260.

Published Online: 18 May 1993

A Numerical Taxonomic Study of Citrus and Its Close Relatives

Zhong Guang-yan, Ye Yin-min

Citrus,  Fortunella, Poncirus,  Numerical taxonomy

 Fifty nine taxa of Citrus, Fortunella and Poncirus were studied by
hierarchical agglomerative clustering analysis and quantas type 3 analysis using 86
morphological characters. Five affinity groups were obtained in Citrus. The first
group includes C. medica, C. limon, C. limonia, C. aurantifolia and C.  iambhiri;
the second includes C.  grandis,  C.  aurantium,  C.  sinensis and C.  paradisi;
the third is mandarin (C. reticulata);  the forth is C. ichangensis;  The last is C.
hongheensis.  Mandarin oranges show two subgroups:  one comprise satsuma,
King, Shagan, Tankan and Bendiguangju, and the other consists of the remaining
typical mandrins.  The two papeda oranges, honghe papeda and ichang papeda,
could not be clustered into the same group, indicating that they might have
evolved from two compeletly different ancestors. Pumelos(C. grandis) show some
relationships to honghe papeda orange. C. limonia is assumed to be a hybrid be-
tween rough lemon and mandarin. The sweet orange(C. sinensis) is considered to
be the offspring of pomelo and mandarin. Zhekiang jinju a small mandarin gener-
ally considered similar to calamondin in China, should be a true mandarin orange
based on our results. Poncirus was well distinguished from the other two genera,
Citrus and Fortunella, by the numerical methods used in this study. Our results
show that citron (C. medica), mandarin (C. reticulata) and pumelo (C. grandis)
are the original species of the subgenus Citrus, which was congruent with the re-
sults obtained by Barrett and Soost (1976), Potvin (1983) and Handa (1985).

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