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Agrostophyllum isuaravum

Agrostophyllum isuaravum

Agrostophyllum isuaravum Ormerod, Orchadian 16 (2011) 569, fig.

Type: C.E. Carr 10583 (holo AMES).

Epiphytic herb. Roots terete, pubescent, 0.12 cm thick. Stem covered by complanate leaf sheaths, rather laxly 11-leaved, 27 by up to 7 cm across the sheaths. Leaves oblong to elliptic, 3.4-12 by 2.3-3.6 cm, thin coriaceous; leaf sheaths oblong, complanate, obliquely truncate- rounded, often black-margined, 4-6 by 1.5-2.0 cm; base contracted; apex minutely obtusely equally bilobed. Inflorescence terminal, semiglobose, densely many-flowered, with numerous bracts and sheaths, c. 3.4 cm diam. Pedicel and ovary 6-ribbed, 0.5 cm long. Median sepal ovate-elliptic, 0.43 by 0.23 cm; apex subacute, weakly keeled near apex; 3-nerved. Lateral sepals at the base shortly connate, obliquely ovate-elliptic, 0.57 by 0.29 cm; lower basal margin shallowly saccate; apex acute, outside weakly keeled. Petals ovate-oblong, 0.45 by 0.2 cm ; apex obtuse; 3-nerved. Lip 3-lobed, c. 0.6 cm long; hypochile retrorse saccate, 0.3 cm long, the sac c. 0.1 cm long, lwith broadly rounded ateral lobes c. 0.19 by 0.1 cm; ligula subquadrate, emarginate, obliquely erect, papillose-pubescent; epichile suborbicular, with irregular dentate margins and apiculate apex, c. 0.3 by 0.4 cm. Column c. 0.3 cm long; apical wings deltate, low; median with a large substigmatic process; column foot retrorse, c. 0.13 cm long.
(after Ormerod 2011).


Sepals cream colour, petals and lip white, column cream colour, anther pale brown.

Secondary forest. Altitude 1370 m.

Malesia (New Guinea), endemic.

Papua New Guinea (Central Province).

Intermediate growing epiphyte.

February.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Undetermined
  • Subtribe Agrostophyllinae
  • Genus Agrostophyllum
  • Species Agrostophyllum isuaravum

Agrostophyllum isuaravum resembles A. papuanum Schltr. in habit but differs in the ovate-oblong, obtuse petals (not lanceolate, acute), the retrorsely saccate hypochile (not globose, straight-backed), and the low triangular, entire column wings (not flabellate, dentate) with a vertical base to the substigmatic process (not oblique).


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Agrostophyllum isuaravum

Agrostophyllum isuaravum Ormerod. Drawing by Paul Ormerod in Orchadian 16 (2011) 569, fig., based on the type: C.E. Carr 10583