Hibiscus cannabinus L. (Malvaceae), A Newly Naturalized Plant in Taiwan

臺灣新歸化錦葵科植物－－大麻槿

Hibiscus cannabinus L., native to Africa and India, has been cultivated as a fiber crop for many centuries. Recently, we found it has been naturalized to central, southern and eastern low altitudes in Taiwan. This alien species is very similar to H. sabdariffa L. but is distinguished from the latter by the corolla yellow with crimson center, and the lobe of calyx long caudate and white tomentose, each lobe with a gland at the base and epicalyx spiny. A taxonomic treatment, distributions, habitats, color photographs, line drawings, and voucher specimen were provided to aid identification. 大麻槿（Hibiscus cannabinus L.）原產於非洲及印度，幾世紀以來常被栽培作為纖維作物。目前發現歸化於臺灣中、南部及東部低海拔地區路邊之荒廢農田及草生地。其外觀與洛神葵（H. sabdariffa L.）相似，主要區別在於前者花冠黃色但中心深紅色；花萼裂片長尾狀、基部具腺並被白色棉毛及副萼被刺毛等。本文描述其形態特徵、地理分佈及生育地環境，並提供彩色圖片、引證標本與線繪圖以資辨識。