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International Journal of Botany
Year: 2006  |  Volume: 2  |  Issue: 4  |  Page No.: 340 - 352

Pitcher plants of Lambir Hill in Miri, Sarawak State of Malaysia

Jumaat H. Adam and Hafiza A. Hamid    

Abstract: Three species and two varieties of pitcher plants were recorded from Lambir Hill in Miri, Sarawak State of Malaysia. They were Nepenthes ampullaria Jack, Nepenthes gracilis Korthals, Nepenthes hookeriana Lindley, Nepenthes rafflesiana Jack var. subglandulosa Adam and Hafiza var. nova and Nepenthes mirabilis (Loureiro) Druce var. echinostoma (Hook fil) Adam and Wilcock. A dichotomous key to these taxa was given. Nepenthes ampullaria was found from 50 to 150 m. Nepenthes gracilis and Nepenthes rafflesiana var. subglandulosa was recorded at 100 m altitude but absent at 50 m altitude. Nepenthes hookeriana and Nepenthes mirabilis var. echinostoma were confined at altitude 50 m but were absent from altitude 100-150 m. These taxa can easily be identified by their morphological characters. Nepenthes ampullaria differs from the other species by possessing the paniculate inflorescence, bracteolate flowers, having only lower pitchers which is urceolate in shape, the lids sizes are distinctly smaller the mouth of the pitcher, lower lid surface glandless and trifid spurs Nepenthes gracilis differs from the other four taxa by it sessile leaves, leaves base being decurrent into two wings, the stem triangular in shape, inconspicuous peristome teeth, very thin peristome (≤1 mm) and inner surface of pitcher wall covered with exposed digestive glands. Nepenthes hookeriana differs from Nepenthes ampullaria by the present of both upper and lower pitchers in the former species and the absence of upper pitcher in the later species. Nepenthes hookeriana differs from Nepenthes gracilis by its cylindrical upper stem, infundibulate upper pitcher and inner pitcher cavity of both upper and lower pitchers covered with digestive glands; Nepenthes hookeriana can be distinguished from Nepenthes rafflesiana var. subglandulosa, Nepenthes mirabilis var. echinostoma by possessing inner pitcher cavity wall wholly covered with digestive glands and lower lid surface sparsely covered with honey glands. Nepenthes mirabilis var echinostoma strikingly differs from the other four taxa in having flattened and very thick peristome and the upper pitcher shape differentiate into tubulose upper half and infundibulate lower half.

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