Abstract

The genus Mazus Lour. (Scrophulariaceae) in Taiwan is revised based on comparative morphological, palynological, and cytological studies. Six species, Mazus alpinus Masamune, M. fauriei Bonati, M. goodenifolius (Hornem.) Pennell, M. miquelii Makino, M. pumilus (Burm. f.) Steenis, and a new species M. tainanensis T. H. Hsieh are recognized in this paper. The spotting on the lower lip of the corolla, chromosome number, and pollen grains are all important characters in separating the Taiwanese taxa. The chromosome number of M. alpinus, M. goodenifolius, and M. miquelii is 2n= 20 (diploid); the chromosome number of M. faurei and M. pumilus is 2n=40 (tetraploid) and M. tainanensis is 2n=60 (hexaploid). SEM micrographs of pollen grains and seeds, chromosome counts, a key to species and descriptions, distribution maps, and taxonomic notes are provided.

中文摘要

根據外部形態、花粉、種子、細胞學和地理分布來訂正省產通泉草屬植物。本研究指出本省有6個分類群，分別為高山通泉草、佛氏通泉草、阿里山通泉草、通泉草、葡莖通泉草、和台南通泉草。在細胞學上，高山通泉草、葡莖通泉草和阿里山通泉草為二倍體2n=20，佛氏通泉草和通泉草為四倍體2n=40，台南通泉草為六倍體2n=60。本文並提供花粉、種子、分布圖、檢索表、分類群描述等資料。

Keyword: Mazus, Scrophulariaceae, Chromosome number, Revision, Taiwan.