GROUP Filamentosum
Characterized by thin, short, pendant stems arising from the previous stem carrying a single, persistent, apical, linear-lanceolate, acuminate leaf [the juvenile stem has several leaves] and an apical, short, racemose inflorescence and has successive, fleshy, narrowly 3 lobed, margin of the lateral lobes dentate to ciliate, the anther is narrowly ovoid and long surpasses the apex of the column.
References W3 Tropicos, Kew Monocot list , IPNI ; Icones Orchidacearum Vol 12 Plate 1242 Hagsater & Sanchez 2009 see recognition section; Icones Orchidacearum 15 [1] Plate 1543 Hagsater & Sanchez 2015 see recognition section; Icones Orchidacearum 16[2] Plate 1668 Hagsater & Sanchez 2018 see recognition section;