Agrostophyllum yanemense

Agrostophyllum yanemense

Agrostophyllum yanemense Ormerod, Orchadian 17 (2013) 379, fig.

Type: M.S. Clemens 12087 (holo US; iso MICH).

Epiphytic (?) herb. Roots terete, pubescent, to 0.2 cm thick. Stems caespitose (?), sublaxly foliose, to 30 by 0.175-0.45 cm wide across the leaf sheaths; at the base terete , higher up compressed. Leaves linear-lanceolate, obliquely erect, 4.8-8.5 by 0.35 cm; leaf sheaths open to the next sheath apex, its stipules lanceolate, acute, 0.45-0.6 cm long; apex deeply bidentate, tips 0.1-0.2 cm long. Inflorescence terminal, to 2 by 0.8-1.2 m; at the base enclosed by 3-4 broad sheaths, containing numerous bracts and smaller sheaths, successively 1-3-flowered at a time. Pedicel and ovary subterete, 0.85 cm long. Median sepal broadly oblong-lanceolate, 0.73 by 0.3 cm; upper third carinate; apex acute; 5-nerved. Lateral sepals obliquely oblong-lanceolate; upper half carinate; apex subacute; 5-nerved, 0.85 by 0.3 cm (0.8 cm along midrib). Petals obliquely oblong-lanceolate, c. 0.7 by 0.22 cm; apex acute; 3-nerved. Lip 3-lobed, 0.8 cm long; hypochile c. 0.35 by 0.2 cm, 0.1 cm high, shortly retrorse saccate, inside with a thick median keel, its lateral lobes oblique; ligula subquadrate, widely bidentate, papillose­ pubescent, raising, c. 0.1 cm above the lateral lobes; epichile trilobulate, 0.45 by 0. 57 cm, at the base with 2 low fleshy thickenings, its lateral lobules dolabriform, its midlobule subquadrate, c. 0.18 by 0.24 cm. Column semiterete, 0.5 cm long (without anther cap).
(after Ormerod 2013)


Leaf sheaths with black-margin. Inflorescence at the base enclosed by 3-4 black-margined sheaths. Flowers white.

Not recorded. Altitude 1525-1830 m

Malesia (New Guinea), endemic.

Papua New Guinea (Morobe Prov.), see map

Intermediate to cool growing epiphyte.

March, April.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Undetermined
  • Subtribe Agrostophyllinae
  • Genus Agrostophyllum
  • Section Agrostophyllum
  • Species Agrostophyllum montis-jayanum

Agrostophyllum yanemense is closely related to A. spinuliferum Ormerod ssp. spinuliferum but differs in the shorter stems (to 3 versus 3.4-4.15 cm), obliquely erect leaves (not stiffly erect), leaf sheaths that are open right down to the next sheath apex (not 3/4 of the way), shorter leaf sheath stipules (0.45-0.60 versus 0.68-0.83 cm), flowers with broader petals (0.22 versus 0.18 cm) which are oblong-lanceolate (not ligulate-lanceolate), and a subquadrate epichile midlobule (not transversely oblong-elliptic).


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Agrostophyllum yanemense

Agrostophyllum yanemense Ormerod, drawing by Paul Ormerod, Orchadian 17 (2013) 379, fig., based on the holotype: M.S. Clemens 12087