Leaves
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Leaves confined to the ascending portion of stem, upper surface dark green, lower surface somewhat paler, elliptic to ovate, 4-8(-10) cm long, (1.5-)2-4 cm wide, midrib impressed on upper surface, slightly raised on lower surface, apex acuminate, base attenuate, petioles 1.5-3 cm long (incl. sheath), flaring to
a sheath 0.5-1 cm long, the sheath glabrous or sparsely pubescent.
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Flowers
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Flowers few to numerous in loose spikes 5-15 cm long, glabrous to densely pubescent throughout, each flower subtended by a narrowly ovate, channeled, 1-3-nerved bract 1.2-2 cm long, margins entire to rarely finely serrulate; dorsal sepal ascending, pale green to greenish yellow, ovate, 5-8 mm long, glabrous or sparsely pubescent, lateral sepals partly connate, closely enclosing base of labellum, pale green to yellowish green, ovate to oblong-ovate, 6-8 mm long, glabrous; lateral petals appressed to the dorsal sepal, ascending, greenish yellow, ± unequally ovate, 4-6 mm long, glabrous; labellum horizontal or slightly ascending, pale to bright yellow, 9-12 mm long, base divided into 2 spurs, each containing a single unstalked gland, middle part of lip convoluted and forming a tube 4-6 mm long, unappendaged or with 0-6 pairs of small teeth along the lateral edge, somewhat fleshy, apex expanded into a conspicuous transverse, 2-lobed blade 3-5 mm long, apex emarginate; column ca. 2.5 mm long.
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