The flowers of Eulophia calanthoides grow in lax spikes. Narrow bracts occur on the stalk at the base of each flower. The three narrowly elliptic sepals are greenish yellow with short, velvety hairs on the inner surfaces. Their margins attenuate near the tips, i.e. are acuminate. This feature may have caused the uncertainty between E. acuminata and this species.
The uneven patch of thin, yellow protuberances forming the crest in the centre of the lip, facilitates identification as these crests of Eulophia flowers vary according to the species. Patterns of narrow dark lines of varying colour may be seen at the back of the lip next to the crest. The lateral petals, also narrowly elliptic with acute tips, are angled forward in typical Eulophia fashion. The outer surfaces of the tepals are olive green to a dull buff colour. There is a thumb-like spur at the back of the lip (www.orchid.unibas.ch).
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