Abstract
The relationships among Ajuga formosana Hay., Paraphlomis gracilis (Hemsl.) Kudo and P. parviflora Wu & Li have been confusing for a long time. Kudo (1929) treated A. formosana as conspecific with P. gracilis. We accept the generic name Paraphlomis, and we found that the Taiwan specimens so named P. gracilis are different form those of mainland Chinese ones on the basis of their external and pollen morphology and geographical distribution. Therefore, we propose a new combined name, i. e., P. formosana (Hay.) Hsieh & Huang, comb. nov. for the Taiwan plants. The name of P. parviflora was based on the specimen collected by Suzuki and is considered to be conspecific th P. formosana. The chromosome number of P. formosana (2n = 34) is also reported.
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