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Acianthinae_species
Corybas recurvus D.L. Jones
Nomenclature
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Subgenus: CorysanthesSection: Corysanthes
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Synonyms: 1
SUMMARY
Plant: terrestrial tuberous herb forming extensive colonies
Leaf: 15-40 mm x 15-44 mm, broadly cordate to orbicular, rarely lobed, thin-textured, green on both surfaces, paler and pellucid beneath, apiculate on a peduncle 2-3 mm long
Ovary: 5-6 mm long, narrow, recurved, subtended by a small, ovate bract
Flower: 15- 25 mm long, dark reddish purple to purplish-black, strongly recurved and often nearly parallel to the ground, dominated by the dorsal sepal and labellum
Dorsal sepal: 23-34 mm x 12-20 mm, obovate-spathulate in outline when flattened, narrow proximal part greyish with dark purple striations, distal expanded part wholly purplish-black, concave, erect in the proximal half then curved forwards at about 90 degrees, protruding over the labellum lamina, broadly obtuse
Lateral sepals: ca 5 mm x 0.5 mm, linear-tapered, acute to acuminate, whitish, connate at the base, projected forwards and erect in front of the base of the labellum tube, apex entire or unequally lobed.
Lateral petals: ca 3.5 mm x 0.5 mm, falcate, whitish, auriculate at the base where they join the column, then tapering to a filiform point, sometimes unequally lobed
Labellum: conspicuous, labellum tube 6-7.5 mm long, longer than the lamina, erect throughout then abruptly decurved through 180 degrees and greatly expanded into a circular or oblate lamina; lamina 14-20 mm x 9-11 mm, whitish in the center the rest dark reddish purple to purplish-black, veins darkest, margins adorned with numerous, broad, blunt, irregular teeth to 1 mm long, much of the surface covered with short black, erect or appressed teeth especially prominent around the boss; callus consisting of a series of coarse, irregular inward-sloping, transverse plates
Boss: mounded, fairly prominent, reddish-white, thickened in longitudinal section
Auricles: about 1 mm across, widely opening, directed downwards, the opening partly hidden by the base of the petals
Column: ca 3.5 mm long, recurved, broadest at the base, minutely winged; stigma ca 1 mm in diameter, plus or minus elliptical, concave. Anther ca 1.5 mm long, obtuse; pollinarium ca 1 mm x 1 mm; pollinia 4 narrow-oblong, yellow, mealy; viscidium oval, ca 0.4 mm long Capsule ca 8-12 mm x 4-5 mm, ovoid, on fleshy peduncle to 20 cm tall.
Type: Western Australia; Toolbrunup, Stirling Ranges, 34°01°S' 117°50'E, 31 August , 1986, D. L. Jones 2441 and T. D. Jones (holo CBG, iso CBG, PERTH).
Distribution: Widely distributed in southwestern Western Australia (north of Perth to Walpole and to the east of Albany).
Ecology: This common species occurs in a wide range of habitats, including dense scrubby forests developed around springs and streams, high rainfall Karri forests and coastal scrubs on stabilized dunes.