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Plocoglottis lacuum

Plocoglottis lacuum

Plocoglottis lacuum J.J.Sm., Nova Guinea 18 (1935) 16, pl. 4, fig. 5

Type: Docters van Leeuwen 11054 (holo L)

Roots 0.1-0.2 cm diameter. Rhizome creeping 0.4-0.7 (-1.2) cm diameter, internodes between stems 6-11. Stems 4.3-8.1 cm apart, 57-200 by 0.3-0.7 cm, cylindrical or angular when dried, internodes 12-19 1-8.3 cm long; 6-12-leaved. Cataphylls 4-8. Leaves petiolate or sessile; sheaths 5-9.6 cm long; petiole sessile to 3.9 cm long; blade 25-45.3 by 3.2-6.9 cm, index 5-8 (-10), narrowly lanceolate sometimes linear, base cuneate, apex acuminate, glabrous, with 3-6 prominent veins underneath. Inflorescence 106-146 cm long, 30-162-flowered. Peduncle 37-64.5 by 0.4-0.5 cm, densely pubescent, internodes 5-8 (-14), 0.15-17.7 cm long; peduncle scales 0.5-3.5 cm long, tubular, apex obtuse to acuminate sparsely pubescent; rachis 44-113 by 0.2-0.3 cm, densely pubescent, internodes 26-162, 0.3-13.6 cm long. Bracts; sterile bracts 2-7; floral bracts 0.73-1.2 by 0.32-0.58 cm, lanceolate to triangular-lanceolate, apex acuminate, densely pubescent, with 5-6 prominent veins. Flowers up to 2.8 cm wide. Median sepal 1.45-1.61 by 0.4 0.57 cm lanceolate, apex acute, sometimes acuminate to apiculate, densely abaxially , sparsely adaxially pubescent, above half to apex thick in texture, 6-10 distinct veins. Lateral sepals 1.5-1.75 by (0.45-) 0.5 cm, oblong-lanceolate, subfalcate, base oblique with short lobule, apex acuminate, densely abaxially, sparsely adaxially pubescent, with 6-8 distinct veins. Petals 1.3-1.51 by 0.25-0.33 cm, oblong-lanceolate, subfalcate, base broadly cuneate or oblique, apex acute to acuminate, sparsely pubescent on both sides, the middle thick in texture, lateral margin thin, with 3 distinct, 4 indistinct veins. Lip total 1-1.2 by 0.61-0.75 cm, adnate to column-foot with basal lamellae, quadrangular, with 9-13 distinct veins, at base with a small sac formed by column-foot and lip base 0.1-0.2 cm long, with two basal lamellae, grooved along the median of adaxial side, with a short depression between two thickening, on the adaxial side with two thickenings, extending from base to below apex, sometimes very thick at base, lateral margin in basal half thick, entire, sometimes minutely erose, in upper half to apex slightly thick, minutely erose, abruptly truncate, in the middle with 0.11-0.25 cm long, triangular, acute-acuminate to acuminate acumen, glabrous sometimes sparsely abaxially pubescent. Column 0.6-0.7 by 0.3-0.4 (-6) cm, clavate, wihtout lateral wings, sparsely abaxially pubescent, erose to sparsely dentate. Anther 0.2 by 0.1-0.14 cm, cordate to oblong, apical margin entire sometimes erose, apex acute to obtuse, sparsely abaxially pubescent, long keel. Stigma obdeltoid, rostellum elliptic. Pollinia 0.1 by 0.05-0.08 cm, semi-orbicular or sometimes orbicular in lateral view. Pedicel with ovary 1.32-1.9 (-2.2) by 0.1-0.3 cm, clavate. (After Eang Hourt, unpublished manuscript 2004)


Leaves yellowish, flower with sepals and petals (dark) yellow with (reddish) brown spots bright red in the centre; lip wholly cream, fruit reddish.

Terrestrial in lowland forest; 10 to 450 m.

Malesia (New Guinea).

Papua (Indonesia); Papua New Guinea. See map

distribution map

Warm growing terrestrial, requires shaded position.

March, August, September, November.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Collabieae
  • Subtribe Not used
  • Genus Plocoglottis
  • Section Caulescentes
  • Species Plocoglottis lacuum

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Plocoglottis lacuum

overview picture

Plocoglottis lacuum

Plocoglottis lacuum J.J.Sm., floral analysis, drawing J.J. Smith, from Docters van Leeuwen 11054

Plocoglottis lacuum

Plocoglottis lacuum J.J.Sm., lip and bract, drawing J.J. Smith, from Docters van Leeuwen 11054

Plocoglottis lacuum

Plocoglottis lacuum J.J.Sm., herbarium sheet, Docters van Leeuwen 11054 (isotype specimen BO)