In May 2011, we collected five plants of D. neilgherrensis
in flowering stage from woodlands of
Top Slip, Indira Gandhi Wildlife Sanctuary and
National Park of Tamil Nadu, India (76º49'-
77º21' E, 10º13'-10º33' N), at an elevation of 300
masl. The annual rainfall ranges between 500 and
5000 mm. The plants grew in the superficial,
highly organic rich layer of the forest floor under
shady conditions.