頂頭花－－台灣一種常被誤認的稀有脣形科植物

＂Platostoma hispidum＂ (L.) A. J. Paton, a Rare Mint in Taiwan

頂頭花（＂Platostoma hispidum＂ （L.） A. J. Paton）為唇形科植物，廣泛分布於中國、印度、東南亞等地區。日治時期本種被發現分布於台灣南部，此後未見採集紀錄，目前台灣各標本館中鑑定為本種的標本，大多為球花香薷（＂Elsholtzia strobilifera Benth.＂）或其他種類之錯誤鑑定。最近在台南的野外採集到本種植物，分布於烏山頭地區低海拔山區林緣。本文根據國外研究更正本種學名，描述其分類特徵，提供照片和分布資料，並首次報導其花粉為6溝花粉，表面具網狀紋飾。

＂Platostoma hispidum＂ (L.) A. J. Paton belonging to the mint family (Lamiaceae) is widely distributed in tropical regions of China, India and SE Asia. It was first collected from south Taiwan in 1905. Because of its rarity, no specimen has been collected since then. It is often misidentified in the herbarium of Taiwan. In a recent plant survey, we found a wild population of ＂Platostoma hispidum＂ in Wu-shan-tou area, Tainan City in southern Taiwan. This report provides a botanical description of ＂Platostoma hispidum＂ with color photographs and SEM microphotographs of its pollen grains and nutlets, as well as its taxonomic notes and distribution range in Taiwan.