Dendrobium cucumerinum

Dockrillia cucumerina, commonly known as cucumber orchid or gherkin orchid, is a species of orchid endemic to eastern Australia. It is an epiphytic orchid with creeping stems, gherkin-like leaves and flowering stems with up to eighteen cream-coloured, yellowish or greenish white flowers with purple stripes. It often grows on large trees near streams but is also found in drier forests....read more on Wikipedia.