Paphiopedilum papuanum

Paphiopedilum papuanum is a terrestrial herbaceous orchid. It has 4 to 6 oblong to oblong-elliptic leaves that are 6.5-22 cm long and 2-4.2 cm wide. The leaves are mottled with tessellated dark and light green patterns and have obtuse, tridenticulate apices.^[2][3][5]

The species produces a solitary flower on a reddish or purple, pubescent inflorescence that ranges from 15 to 28 cm in length. The floral bract is ovate, pubescent, and 1.2-1.5 cm long. The flower itself is 6-9 cm wide. The dorsal sepal is ovate, acute, white with a yellowish or greenish center and purplish veins, and is 2.4-2.5 cm long by 1.8-2.6 cm wide. The synsepal is elliptic-lanceolate and subacute. Petals are dull maroon with black spots in the yellowish basal half, oblong-oblanceolate in shape, and 4-4.2 cm long. The lip is dull crimson or brownish maroon, measuring 2.5-3.7 cm long. The staminode is transversely lunate, 4-5 mm long by 6 mm wide, and notched above with short, blunt apical teeth.^[2][3][4]

The plant typically blooms in the summer and fall.^[5]

This orchid is endemic to New Guinea, where it occurs in three known subpopulations: Mount Carstensz (Puncak Jaya), the Arfak Mountains, and the Southern Highlands Province of Papua New Guinea. It inhabits the lower montane forests between 800 and 1,700 meters in elevation.^[6][1]

Paphiopedilum papuanum grows in leaf litter and humus-rich soils, often over limestone or granitic substrates, in shaded or partially sunny spots. The local climate is characterized by heavy rains during winter and spring, with persistent humidity year-round.^[2]

The species was originally described as Cypripedium papuanum by Ridley in 1915 and later transferred to Paphiopedilum by L.O. Williams in 1946. It has also been redescribed as Paphiopedilum zieckianum by Gustav Schoser in 1967, but this name is now considered a synonym.^[2][4]