I do not think wildflowers grow in the tropics. They are more a desert environment flower and normally bloom in September. In Western Australia there are many square miles of wildflowers.
Some here in lower Queensland outback. See 100s of Flickr photos at URL below
http://images.google.com.au/images?hl=en&source=hp&q=wildflowers+western+australia&rlz=1W1IRFC_en&um=1&ie=UTF-8&ei=VT_WSrnuGNuXkAX3m_T3DQ&sa=X&oi=image_result_group&ct=title&resnum=4&ved=0CCAQsAQwAw
Also this URL and browse
http://www.wildflowerswa.com/en/default.htm