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Peristylus brassii

Peristylus brassii

Peristylus brassii Ormerod, Orchadian 17( 2012) 135, fig.

Type: L.J. Brass 10601 (AMES).

Terrestrial herb. Roots terete, pubescent, clustered, c. 10. Stem erect, terete, 3-leaved near apex, 21.5- 26.5 by 0.1-0.4 cm thick; sheaths 3, lax, tubular, 2.5-5.5 cm long. Leaves 1.5-2.3 cm apart, ovate-lanceolate to elliptic, 2.5-5.2 by 0.7-2.1 cm; apex acute to subacuminate; margins crinkly. Inflorescence terminal, 23.9 cm long(in fruit 33.2 cm long with 20.5 cm long peduncle and 12.7 cm rachis); peduncle 16.4 cm long, with 3-4 lax sheathing scales 1.05-1.80 cm long; rachis laxly 12-15 flowered, 7.5 cm long; floral bracts ovate-lanceolate, acute, to 0.8 by 0.38 cm. Pedicell and ovary curved, cylindric-fusiform, 0.8 cm long. Flowers resupinate. Median sepal ovate-elliptic, 0.39 by 0.275 cm; apex obtuse; weakly keeled. Lateral sepals concave, obliquely ovate-elliptic; apex apiculate; keeled, 0.41 by 0.2 cm. Petals connate to the sides of the column, obliquely widely ovate, 0.39 by 0.39 cm; lower margin with a triangular tooth; apex obtuse; 2-nerved. Lip spurred, 3-lobed, free part joined to the column for 0.15 cm, c. 0.25 by 0.48 cm across the tips of the sidelobe; spur fusiform-clavate, 0.45 by 0.18 cm, with obtuse apex; midlobe convex, ovate, c. 0.175 by 0.175 cm, with obtuse apex; lateral lobes cuneate, irregularly truncate, 0.175 by 011 cm; without callus. Column short, stout, 0.15 cm long to tips of stigmatic arms. Fruits (dehisced) 1.1-1.4 cm long, gradually smaller toward the top of the rachis.
(after Ormerod 2012)

Flowers green.

Terrestrial under low woody growths in the bed of a stream. Altitude 2800 m.

Malesia (New Guinea, endemic).

Indonesia (Papua Province, Jayawijaya Regency).

Cool growing terrestrial.


  • Family Orchidaceae
  • Subfamily Orchidoideae
  • Subtribe Orchidinae
  • Genus Peristylus
  • Species Peristylus brassii

Peristylus brassii is similar to P. triaenus and allied species but differs in the lip which has cuneate, truncate lateral lobes and no callus.

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Peristylus brassii

Peristylus brassii Ormerod. Drawing by Ormerod in Orchadian 17( 2012) 135, fig., based on the type: L.J. Brass 10601