Nepenthes gymnamphora (from Greek: gymnos = naked, amphoreus = pitcher) is a tropical pitcher plant native to at least the Indonesian island of Java. There is much confusion surrounding the status of this species and the closely related N. pectinata and N. xiphioides.

Morphological differences between N. gymnamphora* and N. xiphioides (Salmon & Maulder, 1995)

Morphological character	N. gymnamphora	N. xiphioides
Longitudinal leaf veins	3-6 running in outer 2/3- 4/5 of blade	2-3 running in outer 1/2 of blade
Leaf margins	covered with short dense hair	glabrous
Rosette leaf tendril	about as long as the pitcher	2-3 times as long as the leaf
Rosette pitchers	8-12 cm tall, 3-4 cm broad	4-5.5 cm tall, 1.5-2 cm broad
Aerial pitchers	present	absent
Peristome teeth	3-6 times as long as broad	6-8 times as long as broad
Inflorescence	mostly 2 flowered, upper most ones 1 flowered; rarely most or all of them 1 flowered	1 flowered but bearing some 2 flowered pedicels in lower 1/3
Staminal column	hairy at base or over whole length	glabrous

* Salmon & Maulder (1995) treat N. pectinata as conspecific with N. gymnamphora.

Infraspecific taxa

• Nepenthes gymnamphora var. haematamphora Miq. (1851)
• Nepenthes gymnamphora var. pectinata (Danser) Hort.Westphal (1999) in sched. [=N. pectinata]

References

• Clarke, C.M. 2001. Nepenthes of Sumatra and Peninsular Malaysia. Natural History Publications (Borneo), Kota Kinabalu.
• Danser, B.H. 1928. The Nepenthaceae of the Netherlands Indies. Bulletin de Jardin de Botanique, Buitenzorg, Série III, 9(3–4): 249–438.
• Menzel, R. 1922. Beiträge zur Kenntnis der Mikrofauna von Niederländisch Ost-Indien. II. Über den tierischen Inhalt der Kannen von Nepenthes melamphora Reinw. mit besonderer berücksichtigung der Nematoden. Treubia 3: 116–122.
• Micoletzky, H. & R. Menzel 1928. Beiträge zur Kenntnis der Mikrofauna von Niederländisch Ost-Indien. VII. Anguillula nepenthicola Menzel aus kannen von Nepenthes gymnaphora Nees bei Tjibodas. Treubia 10: 285–290.
• Oye, P.v. 1921. Zur Biologie der kanne von Nepenthes melamphora Reinw.. Biologisches Zentralblatt 41: 529–534.
• Salmon, B.R. & R.G. Maulder 1995. Two New Species of Nepenthes from North Sumatra, Indonesia. Carnivorous Plant Newsletter 24(3): 77-85.