白环猪笼草
白环猪笼草 | |
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产自婆罗洲巴哥国家公园的白环猪笼草下位笼,其生长于荒原森林和灌木丛中[1] | |
科学分类 | |
界: | 植物界 Plantae |
演化支: | 维管植物 Tracheophyta |
演化支: | 被子植物 Angiosperms |
演化支: | 真双子叶植物 Eudicots |
目: | 石竹目 Caryophyllales |
科: | 猪笼草科 Nepenthaceae |
属: | 猪笼草属 Nepenthes |
种: | 白环猪笼草 N. albomarginata
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二名法 | |
Nepenthes albomarginata | |
异名 | |
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白环猪笼草(学名:Nepenthes albomarginata)是婆罗洲、西马来西亚和苏门答腊特有的热带食虫植物。[3][4][5]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。[4]
植物学史
[编辑]1848年,托马斯·洛布首次采集到了白环猪笼草。一年后,约翰·林德利在《园丁纪事》中正式描述了白环猪笼草。[2][6]
形态特征
[编辑]白环猪笼草为藤本植物。茎攀爬至4米的高处,直径可达5毫米,呈圆柱形。节间距可达15厘米。[7]
白环猪笼草的叶片为革质,呈披针形,可长达25厘米,宽至2厘米。叶尖急尖,叶基渐尖,抱茎。白环猪笼草的叶片无叶柄。纵脉不明显。笼蔓可长达20厘米。[7]
白环猪笼草下位笼的下三分之一为球形,上部为圆柱形。下位笼的体型较小,仅可高达15厘米,宽至4厘米。腹面具一对可宽达5毫米的笼翼。笼口呈圆形,基部拉长形成一个较短的唇颈。唇为圆柱形,可宽达2毫米,唇齿不明显。[7]唇内缘部分约为截面表面总长度的34%。[8]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。[7]
白环猪笼草的上位笼为圆柱形至漏斗形。笼翼缩小为一对隆起。其余部分与下位笼类似。[7]
白环猪笼草的花序为总状花序,通常雄性花序较长。总花梗可长达25厘米,花序轴可达40厘米。花梗带1至2朵花,长约30毫米,无苞片。萼片为卵形至椭圆形,可长达4毫米。[7]一项对来自同一副标本(J.H.Adam 2417,采集于婆罗洲海拔0至30米的地区)花粉大小的研究显示,其120粒花粉的平均直径为31.8微米(标准误为0.4,变异系数为6.2%)。[9]
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。[7]
白环猪笼草捕虫笼的颜色可为绿色、红色、黑色或具斑点。[3]
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白环猪笼草的下位笼
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白环猪笼草的下位笼
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白环猪笼草的上位笼
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白环猪笼草的上位笼
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白环猪笼草的上位笼
食虫性
[编辑]白环猪笼草最特别的是它只捕食白蚁;大部分猪笼草不会对猎物进行选择。据植物学家马利斯·A·梅尔巴赫(Marlis A. Merbach)和他同事的所述,白环猪笼草是一种食性专一的食虫植物。[10][11][12][13]
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(Hospitalitermes bicolor)附近。[10]当白蚁发现了白环猪笼草的捕虫笼上的白毛后,便会啃食它。在吃了那些白毛后,不管是工蚁还是兵蚁都陆陆续续的掉入了捕虫笼内。
一旦它们掉入了捕虫笼内就再也无法爬出来了。马利斯·A·梅尔巴赫记录到的最高记录是每分钟有22只白蚁落入笼内。一个小时过后,白毛全部消失,无白毛的捕虫笼不能吸引白蚁,也就不再有白蚁落入捕虫笼。
尚未清楚这些白毛是如何吸引白蚁的。但马利斯·A·梅尔巴赫在实验中发现,这些白毛对于白蚁并没有远距离的吸引力。他说:“这一切看起来好像都是巧合,那些白蚁经常在离白毛只有不到1厘米的地方却没有发现它。”
马利斯·A·梅尔巴赫还指出,白环猪笼草是唯一一种将自身的一部分作为诱饵引诱猎物的食虫植物。
生态关系
[编辑]白环猪笼草存在于婆罗洲、西马来西亚和苏门答腊。也存在于尼亚斯岛及槟榔屿等较小型的岛屿。[14][15]其海拔分布范围为0至1200米。[3][16]
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。[7]其陆生于泥炭和石灰石基质中。[7][17]
相关物种
[编辑]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%。[4]
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种下类群
[编辑]- N. albomarginata f. sanguinea Toyoda ex Hinode-Kadan (1985) nom.nud.
- N. albomarginata var. rubra (Hort. ex Macfarl.) Macfarl. (1908)[18]
- N. albomarginata var. tomentella (Miq.) Beck (1895)[19]
- N. albomarginata var. typica Beck (1895)[19]nom.illeg.
- N. albomarginata var. villosa Hook.f. (1873)[20]
自然杂交种
[编辑]- N. albomarginata × N. ampullaria[7]
- ? N. albomarginata × N. chaniana[21]
- N. albomarginata × N. clipeata[7]
- N. albomarginata × N. eustachya[4]
- N. albomarginata × N. gracilis
- N. albomarginata × N. hirsuta[7]
- N. albomarginata × N. macrovulgaris[21]
- N. albomarginata × N. northiana [=N. × cincta][7][22]
- N. albomarginata × N. rafflesiana[21][23]
- N. albomarginata × N. reinwardtiana [=N. × ferrugineomarginata][7]
- ? N. albomarginata × N. sanguinea[21][24]
- N. albomarginata × N. veitchii[7]
白环猪笼草与诺斯猪笼草的自然杂交种
[编辑]由于诺斯猪笼草(N. northiana)的分布局限,仅生长在砂拉越石龙门的石灰岩基质上,所以雪线猪笼草更为罕见。
白环猪笼草在杂交中很强势,这使得其与诺斯猪笼草杂交后代完全失去了宽大的唇。该杂交种的捕虫笼为窄漏斗形,笼身为奶油色至暗紫色,并具有红色或黑色的斑点。[25]
白环猪笼草与两眼猪笼草的自然杂交种
[编辑]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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