The flower of Holothrix filicornis has three ovate, acutely pointed sepals, positioned around the flower centre. These sepals appear small and grey against the predominantly white floral parts in the photo.
The only other non-white flower components are the dark ovary curving down behind the flower and the small grey floral bract occurring below the base of each ovary. The shared flower stem seen here is also purplish grey in colour.
The dominant white floral segments are the pair of lateral petals above and the lip below, positioned inside the whorl of the sepals. Each petal has two long and thin, thread-like lobes, variously curving up from the short, broad petal base.
The lip, the lower part of the flower, is similarly broad at its base, but conspicuously five-lobed. Some lip lobes hang down, others are reflexed. Behind the lip lobes the long, thin spur can be seen. It is cylindrical in shape, curving back and down near the ovary (Williamson, 2010).