台灣產石薺寧屬植物（唇形科）之訂正

Revision of Mosla (Lamiaceae) in Taiwan

台灣產石薺寧屬（Mosla Buch.-Ham. ex Maxim.）（唇形科）之分類地位長期以來十分混亂，在標本鑑定上常生混淆，實需進行分類訂正工作。根據外部形態、小堅果和花粉等特徵，可將臺灣產本屬植物分為3種，分別為乾汗草（Mosla chinensis Maxim.）、粗鋸齒薺寧（M. dianthera (Buch.-Ham.) Maxim.）、石齊寧（M. scabra (Thunb.) Wu & Li）。本文比較3種之上述特徵，可明顯予以區分，並提供檢索表便於鑑定之用。另查對Mosla formosana Maxim.原始發表和模式標本與粗鋸齒薺寧相符合，將前者處理為後者之異名。本文並認為小堅果的表面微細構造為區分種階級的良好特徵。

The genus Mosla Buch.-Ham. ex Maxim. has long been a source of confusion in Taiwan. Three species, Mosla chinensis Maxim., M. dianthera (Buch.-Ham.) Maxim. and M. scabra (Thunb.) Wu & Li are recognized in Taiwan in this paper. Mosla formosana Maxim., which was previously treated as an insufficiently known species, is reduced to synonymy under M. dianthera (Buch.-Ham.) Maxim. SEM micrographs of pollen grains and nutlets, chromosome numbers, distribution maps, a key to species and species descriptions are provided. The ornamentation of the nutlet is a good diagnostic character for recognizing plants at specific rank in this genus.