Chin J Plant Ecol     1999 23 (199901):  28-38    ISSN: 1005-264X:  CN: 11-3397/Q A Preliminary Study on the Floristic Geography of Aquatic Macrophytes and Helophytes in Taibai County, Shaanxi Province CHONG Yun-Xiao, YU Dan, XIA Sheng-Lin and Kang Hui Received null  Revised null  Online null Reference   Corresponding author: HE Da-Han