Karen,
Impatiens bicolor is a valid botanical name, both TROPICOS and IPNI have it. It isn't necessarily tropical, being from the Himalayan Mountains. According to an 1863 reference on the Biodiversity Heritage Library (Curtis's Botanical Magazine), specimens were gathered at an elevation of 4,000 feet. Flowers are white and purple hence, presumably, the specific epithet of bicolor. Not sure if this link to the reference will work but I'll give it a try:
http://biodiversitylibrary.org... (Edit: yes it works, for me anyway)
