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Acianthinae_species
Corybas trilobus (Hook. f.) Rchb. f.
Nomenclature
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Subgenus: CorysanthesSection: Nematoceras
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Synonyms: 4
SUMMARY
Plant: Rather stout, variable in size, smaller than macranthus, up to 7 cm high
Leaf: on a petiole 1.3-2.5 cm long; blade 1 - 3.8 cm diam. (up to 15 x 25 mm), reniform or orbicular, more or less distinctly 3-lobed at the tip, middle lobe acute, cordate at the base, fleshy when fresh, membranous when dry , light green above, silvery below, often marked with purple
Peduncle: at first short, shorter than petiole ("flower sessile"), but elongating as the flower withers, and in fruit often 10-20 cm long
Bracts: 2, rather small, Floral bract acute, secondary bract inconspicuous.
Ovary: curved
Flower: 8 - 13 mm long, dull-purple
Dorsal sepal: narrow at the base, dilated above, obovate-spathulate when spread out, arched over the lip, concave, obtuse at the tip; dilated and retuse at apex; rather short, orbicular-concave, more or less emarginate
Lateral sepals: filiform-caudate, erect, 2 - 5 cm. long,
Lateral petals: similar, filiform, erect, 2 - 5 cm. long, smaller (half the length?) of sepals, horizontal
Labellum: involute, tubular below, the margins meeting behind the column and enclosing it; upper part abruptly reflexed and much expanded laterally and downwards, forming a broad saucer-like entrance to the flower; margins erose or nearly entire; very large, 5-nerved, of two parallel recurved lobes, margins nearly entire;Lamina ex¬panded, deflexed, roughly circular, the margins irregularly crenulate or sometimes entire
Auricles: rounded
Column: short, stout, bent backwards.
Capsule: on peduncle elongating up to 20 cm
Distribution: North and South Islands, Stewart Island
Ecology: Growing in shaded places from the North Cape southwards, but often localized.
Elevation: Sea-level to 1500 m