@booklet {109,
	title = {The genus Zantedeschia. Bothalia},
	volume = {11},
	year = {1973},
	abstract = {5-26.},
	author = {"Letty, C."}
}
@booklet {103,
	title = {Lemnaceae Flora of Tropical East Africa},
	year = {1973},
	author = {"Hepper, F.N."}
}
