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Crepidium atrobrachiatum

Crepidium atrobrachiatum

Crepidium atrobrachiatum (Ridl.) Szlach., Fragm. Florist. Geobot. Suppl. 3 (1995) 124

Type: Kloss s.n. (Camp 6a, 3100 ft) (holo BM)


  • Microstylis atrobrachiata Ridl., Trans. Linn. Soc. London, Bot. 9 (1916) 160
  • Malaxis atrobrachiata (Ridl.) P.F.Hunt, Kew Bull. 24 (1970) 78
  • Pseudoliparis atrobrachiata (Ridl.) Marg., Ann. Bot. Fennici 40 (2003) 63

Plants 30—35 cm tall, solitary or sometimes clustered. Rhizome short; nodes covered by loose tubular scales. Leafy stem fusiform, erect, 0.35—0.4 by (0.16—) 0.2—0.34 cm, completely covered by leaf petioles and sheaths. Leaves c. 4; petiole channeled, (0.4—) 0.8— 2(—2.4) by 0.3—0.5(—0.6) cm when spread; sheath loose, tubular, (0.06—) 0.12—0.18(—0.2) by (0.2—) 0.25—0.38(—0.42) cm; blade slightly oblique, oblong ovate to usually lanceolate, (3—) 4—5.2 by 1.2—1.8 cm, with crispate margins, and attenuate and apiculate apex, (3—)5-nerved. Inflorescence 25—28 cm long, erect; peduncle 10—13 cm long; raceme 13—15 cm tall, densely 80—100-flowered. Sterile bracts usually 1, narrowly triangular, reflexed, 0.3—0.4 by 0.09—0.16 cm. Floral bracts deflexed, narrowly triangular to lanceolate, 0.22—0.3 by 0.07—0.1 cm; apex apiculate to acuminate; 1-nerved. Flowers 0.55—0.65 cm in diam. Pedicel and ovary sinuate, 0.2—0.3 cm long. Median sepal ovate to oblong ovate, 0.28—0.31 by 0.15—0.18 cm; apex obtuse to apiculate. Lateral sepals oblique, ovate, 0.27—0.3 by 0.13—0.16 cm; apex obtuse to apiculate. Petals slightly oblique, lanceolate to narrowly elliptic, 0.22— 0.25 by 0.1—0.13 cm; apex shortly attenuate, obtuse to acute; 1-veined. Lip relatively small, sagittate to pear-shaped in outline, (0.2—) 0.27—0.29 by 0.15—0.17 cm; mid-lobe oblong, with distinctly apiculate to attenuate apex. separated from lateral lobes by a distinct, shallow indentation; lateral lobes usually convergent, semiorbicular to semiobovate, 0.05—0.06 by 0.07—0.08 cm, with obtuse apex; central part with 2 parallel, thin, longitudinal, 0.05—0.07 cm long and less than 0.1 mm high lamellae with slightly crispate marginwhich are at the base fused into a callus; basal callus triangular, 0.02—0.05 by 0.04—0.05 cm. Column erect, 0.14—0.15 by 0.03—0.06 cm, minutely papillose; staminodes
(after Hanna B. Margońska 2003)

Leaf sheath green, sometimes brownish or tinged fawn; blade green to dark green above, sea green and paler beneath. Floral bracts green. Pedicel and ovary green to greenish-yellow. Flowers yellow. ; Column pale yellow to whitish-yellow; staminodes deeply blackish green; anther pale yellow to whitish-yellow; rostellum greenish to dark green. Fruit fawn to yellowish.
(after Hanna B. Margońska 2003)

Terrestrial in hill forest. Altitude 759 m.

Malesia (New Guinea, endemic).

Papua (Indonesia). See map

distribution in New Guinea

Warm growing terrestrial.

Not recorded.January

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Malaxideae
  • Genus Crepidium
  • Species Crepidium atrobrachiatum

This species is easily distinguished by the relatively small lip and its short auricles, a distinctly erect gynostemium, and elongate staminodes which are at least twice as long as anther.

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Crepidium atrobrachiatum

Crepidium atrobrachiatum (Ridl.) Szlach. (as Pseudoliparis atrobrachiata). Drawing by Hanna B. Hanna B. Margońska in Marg., Ann. Bot. Fennici 40 (2003) 63, fig.