四川苹果属一新种

A NEW SPECIES OF Malus(ROSACEAE)FROM SICHUAN

新种昭觉山荆子M.zhao jiaoensis Jiang与丽江山荆子M.rockiiRehd。亲缘关系相近。其差异在于花瓣粉红色,雄蕊数较多,果实较小,有一对正中着丝点染色体,花粉表面纹饰较粗。根据雄蕊数较多及具有正中着丝点染色体的特征,认为本种在山荆子系的系统中是比较原始的种。

A new species of Malus,distributcd natively in the mountainous regions of Zhaojiao county(2240～2300 m above sea level)and tentatively named Malus zhao jiaoensis Jiang sp.nov.,is closely related to M.rockii but different from the latter in that it has pink petals,more stamens,smaller fruit,chromosomes with their centromeres at the very middle and thicker lines on the surface of its pollen.Based on the fact that the species has numerous stamens and its chromosomes have their centromeres at the middle,it is assumed that Malus zhao jiaoensis is a relatively primi- tive species.