白环猪笼草

白环猪笼草（学名：*'）是婆罗洲、西马来西亚和苏门答腊特有的热带食虫植物。其种加词“albomarginata”来源于拉丁文“albus”和“marginatus*”，意为“白色”和“边”，指其唇下特有的白色环状绒毛。

1856年，白环猪笼草被引种至英国。唇下有一层密集的白色绒毛，其可能具有引诱白蚁的功能。下位笼球形部分对应的内表面覆盖着消化腺。笼盖近圆形，无附属物。笼盖基部的后方具一根不分叉的笼蔓尾，可长达3毫米。

白环猪笼草植株的大部分披被着密集的白色短毛，但在叶片下面的毛被通常较长。

白环猪笼草具有独特的形态特征：在其唇下具一圈白色的绒毛。已捕获到白蚁的捕虫笼上的白色环状绒毛往往已消失。梅尔巴赫说：“有时会接连几日什么也没有发生，接着某个夜晚过后，捕虫笼内充满了白蚁，同时唇下的白毛也不见了。”

马利斯·A·梅尔巴赫为了研究这一现象，将一棵白毛完整的白环猪笼草放在正在寻找食物的白蚁附近。其海拔分布范围为0至1200米。

白环猪笼草的原生地主要为巽他荒原森林，但也可能存在于低海拔山峰的山顶植被中。

相关物种
2001年，查尔斯·克拉克对产自苏门答腊岛和西马来西亚的猪笼草进行了分支系统学分析，共利用了70个形态特征。以下为猪笼草进化树的“第6分支”，其相关性达50%。
*N. albomarginata var. tomentella (Miq.) Beck (1895)
*N. albomarginata var. typica Beck (1895)

自然杂交种
*N. albomarginata × N. ampullaria
? N. albomarginata × N. chaniana*
*N. albomarginata × N. clipeata
*N. albomarginata × N. rafflesiana
*N. albomarginata × N. reinwardtiana [=N. × ferrugineomarginata]
*N. albomarginata × N. veitchii

白环猪笼草与两眼猪笼草的自然杂交种
红脉猪笼草的分布范围涵盖了婆罗洲和苏门答腊。1981年，仓田重夫在西加里曼丹省采集到了红脉猪笼草的模式标本。次年，仓田重夫描述了这个自然杂交种。

参考文献

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*

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扩展阅读

• 美国种质资源信息网络中[http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?431409 白环猪笼草的信息]
• 食虫植物照片搜寻引擎中[http://www.cpphotofinder.com/nepenthes-albomarginata-614.html 白环猪笼草的照片]

*[http://up-your-toot.blogspot.co.uk/2013/01/nepenthes-albo-marginata-of-penang-hill.html 槟榔屿山的白环猪笼草]