臺灣產薑科新天然雜交——宜蘭月桃

New Natural Hybrid, Alpinia × ilanensis (Zingiberaceae) in Taiwan

臺灣產薑科月桃屬植物有頻繁的種間雜交現象，在本島六個原生種中，有四種曾被報導參與了一網狀雜交關係。本文根據形態及生態地理上的證據，新描述一推斷來自山薑（A. japonica）及普萊氏月桃（A. pricei）的天然雜交——宜蘭月桃（A.×ilanensis），並提供其手繪圖及照片。基於這些雜交個體呈現零散分布以及孕性大幅降低的特性，作者認為此雜交為多次獨立發生的事件。此新雜交組合的發現顯示臺灣本島的六個獨立種均具有相互雜交的能力。

The genus Alpinia in Taiwan was very impressed by its frequent hybridization. Four out of 6 indigenous species in Taiwan proper have been reported to be involved in a reticulate hybridization. This paper describes and illustrates a new natural hybrid A. × ilanensis, putatively derived from A. japonica and A. pricei, which is supported by morphological and ecogeographical evidences. Based on sparse distribution mode and serious fertility reduction in these hybrid individuals, we suppose that the hybridization events between A. japonica and A. pricei have been independently occurred multiple times in field. This newly discovered hybrid reveals that all 6 independent species in this island possess the ability to cross each other.