@article {van_tieghem1906,
	title = {Sur les Heliotropiac{\'e}es},
	journal = {Annales des sciences naturelles. Botanique},
	volume = {9},
	number = {4},
	year = {1906},
	pages = {261{\textendash}271},
	url = {http://bibdigital.rjb.csic.es/spa/Libro.php?Libro=2490\&Pagina=265},
	author = {van Tieghem, P.}
}
@article {448,
	title = {Novorum generum, specierum, varietatum, formarumque Siphonogamarum Index. Anni 1906},
	journal = {Just{\textquoteright}s Botanischer Jahresbericht},
	volume = {34},
	year = {1906},
	month = {1906///},
	pages = {1 - 241},
	keywords = {Heliotropium krauseanum},
	url = {http://www.biodiversitylibrary.org/page/5908876},
	author = {Fedde, F.}
}
@inbook {425,
	title = {Boragineae},
	booktitle = {Flora of tropical Africa, Volume IV, Section 2},
	year = {1906},
	month = {1906///},
	pages = {5 - 62},
	publisher = {Lovell Reeve and Co.},
	organization = {Lovell Reeve and Co.},
	address = {London},
	author = {Baker,J.G. and Wright,C.H.},
	editor = {Thiselton-Dyer,W.T.}
}
