Appendicula rupestris Ridl.1896
Plant and Flower Photos by © Art Vogel
Common Name The Rock Living Appendicula
Flower Size .2" [5 mm]
Found in penninsular Malaysia on riverbanks as a small sized lithophyte with an erect, slender stem carrying grass-like, narrowing to a blunt tip leaves that blooms on an erect, terminal or near stem apex, elongating, 2" [5 cm] long, many flowered inflorescence
I am not sure of this determination as the plant does not have grass-like leaves and many flowers on a terminal inflorescence and fits the description for A undulata more.
Synonyms Podochilus rupestris (Ridl.) Schltr.1900
References W3 Tropicos, Kew Monocot list , IPNI ; Flora of Malaya Vol 1 Holttum 1953; The Orchids of Penninsular Malaysia and Singapore Seidenfaden & Wood 1992 drawing fide
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