1993年,J·H·亚当、C·C·威尔科克和M·D·斯温(M. D. Swaine)将姆鲁山猪笼草与毛盖猪笼草的自然杂交种描述为沙捞越猪笼草。[31]他们基于笼蔓尾和笼盖上表面外围的丝状附属物将其与姆鲁山猪笼草区分开来。他们还比较了姆鲁山猪笼草与其自然杂交种叶片中酚类化合物的分布。但他们并未具体说明研究植株数量和重复次数的多少。[16]因此也有学者质疑这个自然杂交种的存在。[27]查尔斯·克拉克写道,他们在描述沙捞越猪笼草时认为“这样的研究不容易进行重复实验。”[16]尽管这个自然杂交种可能存在,但沙捞越猪笼草的描述也有可能是基于姆鲁山猪笼草的下位笼标本得出的。[16]
Folia mediocria sessilia, lamina elliptica ad lanceolata, nervis longitudinalibus utrinque 2-8, plerumque 4, basi profunde oblique amplicauli fere, in alas 2 decurrente ; ascidia rosularum ignota ; ascidia inferiora parva, ovato-conica, alis 2 fimbriatis, peristomio operculum versus acuminato, cylindrico, ad l l/2 mm lato, costis c. 1/2 mm distantibus v. indistinctis, dentibus 0 ; operculo ovato, facie exteriore plerumque appendicibus filiformibus, superea basi fascibus 2 filorum ramosorum, facie inferiore plana ; ascidia superiora magnitudine mediocria, subtubulosa, parte inferiore paulum dilatata, alis 2 fimbriatis raro costis 2 prominentibus ; peristomio operculum versus acuminato, cylindrico v. applanato, 1-5 mm lato, costis 1/2-1/3 mm distantibus, saepe indistinctis, dentibus 0 ; operculo ovato raro rotundato-elliptico, facie superiore plerumque appendicibus filiformibus, prope basim 2 fascibus filorum ramosorum, facie inferiore plana ; inflorescentia racemus parvus pedicellis plerumque 2-4, raro ad 15 mm longis, omnibus 1-floris ; indumentum in ascidiis iuvenilibus et in inflorescentiis parcum stellatum adpressum, ceterum 0.
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