词条 | 莱佛士猪笼草 |
释义 | 莱佛士猪笼草是以史丹福·莱佛士(Stamford Raffles)的名字命名的热带食虫植物。它的分布非常广泛,包括婆罗洲(Borneo)、苏门答腊(Sumatra)、马来半岛(Peninsular Malaysia)和新加坡。莱佛士猪笼草拥有大量的变种,数目仅次于奇异猪笼草(N. mirabilis)。仅在婆罗洲就至少有4种不同的变种。莱佛士猪笼草可以长出与马来王猪笼草(N. rajah)相媲美的巨大笼子。 植物学史莱佛士猪笼最早于1819年由威廉·杰克博士(Dr. William Jack)发现。在《柯蒂斯植物学杂志(Curtis's Botanical Magazine)》上刊登了杰克博士从新加坡寄来的信,他这样写道: “你们无法想象新加坡是多么的美丽。我来到位于马六甲海峡(the Straits of Malacca)附近的群岛上。海面上镶嵌着披着茂密森林的小岛,它们沐浴着明媚的阳光……我恰巧看到了斧头是怎么做成,还获得其他更多的有趣发现,特别是两种新的猪笼草(莱佛士猪笼草和苹果猪笼草)。它们的美丽远超过了其他已知品种。我对他们进行全面的描述,并画了两张图。莱佛士爵士十分的着急,他认为我们应该发表我们的发现。他建议把这些新种寄回国,使得在国内的人也能看到它的美丽,并能引起那边人们对苏门答腊植物的重视。” 在那时,莱佛士猪笼草是当时所知的最大的品种。在1850年的《园丁与农夫杂志(Gardener's and Farmer's Journal)》中,对莱佛士猪笼草进行了这样的描述: “无论谁看到这个植物都会想,这也许就是植物王国里最令人惊叹的植物了吧。它令人无法忘记,它是现在欧洲所知的最大的猪笼草品种。” 原生地与分布莱佛士猪笼草是分布广泛的低地猪笼草。在马来半岛东南部地区,特别是柔佛(Johor),和苏门答腊西海岸因德拉普拉(Indrapura)到巴勒斯(Barus)都有分布。 莱佛士猪笼草一般生长在开阔的砂质湿地中。也曾在荒地森林(kerangas forest)、次生林、泥炭沼泽森林边缘、正常森林和海边的悬崖发现过莱佛士猪笼草。它通常可以生长在海拔1200m的地区,有时也会在海拔1500m的地方看到它。 形态特征莱佛士猪笼草是一种藤本植物。茎可有15m长,直径可达10mm。节间距最长为20cm。笼蔓最长可超过110cm。 莱佛士猪笼草的下位笼呈球状,有发达的翼(wing)。下位笼的高度很少超过20cm,但巨型个体的莱佛士猪笼草可有35cm高,15cm宽。上位笼呈漏斗状,且其唇的前端凸出。这两种捕虫笼都有超过3cm的细长唇颈。 捕虫笼的颜色丰富,从暗紫色到几乎全白都有。典型的莱佛士猪笼草下位笼是浅绿色的且带有紫色的斑点,上位笼则为奶油色。 莱佛士猪笼草的花序为总状花序,有16~70cm长。花朵为红色或紫色。每个小花梗上通常只有一个朵花,偶尔出现两朵。 幼苗带有棕色或白色的且容易脱落的长毛,成株则只有在花序上才一些稀疏的棕色短毛。 种植方法莱佛士猪笼草是非常受欢迎的低地猪笼草,生活在一年大部分时间都炎热潮湿的热带低地丛林中。但它也可以在晚上温度较低且湿度也较低的中地地区生长。它可能是猪笼草收藏者见到的第一种相对耐寒的低地猪笼草。莱佛士猪笼草应该种植在阴凉的且有强烈散射光的环境中,或有明亮的人工照明的培养室里。浇水时应用软水,最好为蒸馏水,以免盐分积累。这不仅难看,也会损伤猪笼草的须根。不建议使用腰水的方法。使用潮湿,排水良好的介质较好。食虫植物不需要喂食。猪笼草的消化酶没有消化大型猎物的能力,消化不了的猎物会滋生细菌产生臭味,还会影响植株的健康。 种下类群因为莱佛士猪笼草的分布很广,所以无论是在形状还是颜色方面,莱佛士猪笼草的个体差异都很大。下面是莱佛士猪笼草的种下类群。下面的命名大多都不是正式的。 Nepenthes rafflesiana f. alba Hort.Westphal (2000) nom.nud. Nepenthes rafflesiana var.alata J.H.Adam & Wilcock (1990) · Nepenthes rafflesiana var.ambigua G.Beck (1895) Nepenthes rafflesiana var.elongata Hort. (1897) Nepenthes rafflesiana var. excelsior (Hort.Williams) G.Beck (1895) [=(N. ampullaria × N. rafflesiana) × N. rafflesiana] Nepenthes rafflesiana var. glaberrima Hook.f. (1873) Nepenthes rafflesiana var. hookeriana (auct. non Low: Hort.Veitch ex Mast.) Becc. (1886) [=N. × hookeriana] Nepenthes rafflesiana var. insignis Mast. (1882) Nepenthes rafflesiana var. longicirrhosa Tamin & M.Hotta in M.Hotta (1986) nom.nud. [=N. longifolia][2][4] Nepenthes rafflesiana var. minor Becc. (1886) Nepenthes rafflesiana var. nigropurpurea Mast. (1882) Nepenthes rafflesiana var.nivea Hook.f. (1873) Nepenthes rafflesiana var. subglandulosa J.H.Adam & Hafiza (2006) Nepenthes rafflesiana var.typica G.Beck (1895) nom.illeg. Nepenthes rafflesiana var.vittata Lauffenburger (1995) nom.nud. Nepenthes rafflesiana pallida Hort.Veitch ex Wilson (1877) [=(N. khasiana × N. gracilis) × N. rafflesiana] 巨型个体巨型莱佛士猪笼草生长于婆罗洲西北海岸和古晋(Kuching)以西110km的士马丹(Sematan)海滨小镇。这种个体的原生地是一些植被茂密的森林。巨型猪笼草方方面面都比普通的莱佛士猪笼草要大。它的茎可攀至15m高的地方。叶片长度可为原来的2.5倍。下位笼可有35cm高,15cm宽,容积可达到1L。捕虫笼的颜色多种多样,从白底红斑到深紫色都有。上位笼可能是全绿的或带班的。它的花序也很巨大,可达1m。小花梗可达1.5cm,花带有暗红色的被片。 除了大小之外,巨型莱佛士猪笼草的叶片也与普通的不同,它的叶片带有金属的光泽。所以巨型莱佛士猪笼草不是因为环境的不同造成的,而是因为个体的差异。 自然杂交种下面是已发现的莱佛士猪笼草的自然杂交种。 N. albomarginata × N. rafflesiana N. ampullaria × N. rafflesiana [=N. × hookeriana] ? (N. ampullaria × N. rafflesiana)× N. mirabilis [=N. × hookeriana × N. mirabilis] N. bicalcarata × N. rafflesiana ? (N. bicalcarata × N. rafflesiana) × N. mirabilis var. echinostoma N. clipeata × N. rafflesiana N. gracilis × N. rafflesiana N. mirabilis × N. rafflesiana (including N. mirabilis var. echinostoma × N. rafflesiana) 保护状况由于原生地的破坏和盗采,包括莱佛士猪笼草在内的大多数的野生猪笼草都受到威胁。目前,莱佛士猪笼草列于CITES附录II中,因此它的国际贸易受到了限制。如今市场上的莱佛士猪笼草都是通过组织培养、扦插、播种等方式得到的。 参考文献1^ Phillipps, A. & A. Lamb 1996. 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