Abstract: The coverages and densities of Plantago virginica populations in different inhabiting periods in the campus of Zheijiang Normal University were surveyed by the successive sampling. The deviation coefficients were calculated and the pattern scale and pattern grain were analyzed. The results showed:(1)The populations of Plantago virginica surveyed were obvious clumpy distributed; (2) All the surveyed populations were found with a patch of 30~50 cm in diameter including patch gap;(3)The number of the population patches followed an order as less→more→less, which was related to their seed spread characteristics;(4)negative correlation between the coverages of the populations and their deviation coefficients was found, which showed that the populations of Plantago virginica became less clumping distributed in appearance with the time after their inhabiting.

Key words: Plantago virginica, intensive distributive pattern