H. Rider Haggard 
Allan and the Holy Flower 

Sir Henry Rider Haggard was an English writer of adventure novels set in exotic locations, predominantly Africa, and the creator of the Lost World literary genre. His stories, situated at the lighter end of the scale of Victorian literature, continue to be popular and influential. He was also involved in agricultural reform and improvement in the British Empire. "Allan and the Holy Flower" is a 1915 novel by H. Rider Haggard featuring Allan Quatermain. The plot involves Quatermain going on a trek into Africa to find a mysterious flower. (Excerpt from Wikipedia)