One of These Flowers is Not Like the Others

It is the dry season in Tanzania right now and most of the vegetation is brown. All these lush flowers were grown at the Neptune Hotel in Ngorongoro by a staff of 7 gardeners, except for one wild flower. Can you guess which one it is?

[Margo]

Nice selection of wild flowers Maybe the top left corner is not the one

[Kerri]

Awesome shots

[Diane]

I don't know which one is the wildflower--but they are all beautiful!