BioStor
 | Studies in the Boraginaceae---XI. (1) The species of Tournefortia and Esserschmidtia in the Old World. (2) Notes on Brand's treatment of Cryptantha (3) New or otherwise noteworthy species I M Johnston (1935) Journal of the Arnold Arboretum 16: 145-205 |
 | How Rich is the Flora of Brazilian Cerrados? A A J F Castro, F R Martins et al. (1999) Annals of the Missouri Botanical Garden 86: 192-224 |