TY - BOOK T1 - Piptatherum and Stipa (Gramineae) in the Arabian Peninsula and Tropical East Africa Y1 - 1989 A1 - H. Freitag SP - 115 EP - 132 PB - Edinburgh, University Press ER - TY - JOUR T1 - Molecular phylogeny of Camphorosmeae (Camphorosmoideae, Chenopodiaceae): implications for biogeography, evolution of C 4 -photosynthesis and taxonomy JF - Taxon Y1 - 2011 A1 - G. Kadereit A1 - H. Freitag A1 - G, Kadereit A1 - H, Freitag SP - 51 EP - 78 VL - 60 IS - 1 ER - TY - JOUR T1 - Phylogeny of Amaranthaceae and Chenopodiaceae and the evolution of C4 photosynthesis JF - Int. J. Plant Sci Y1 - 2003 A1 - G. Kadereit A1 - T. Borsch A1 - K. Weising A1 - H. Freitag SP - 959 EP - 986 VL - 164 IS - 6 ER - TY - JOUR T1 - The genus Piptatherum (Gramineae) in Southwest Asia. Notes Roy JF - Bot. Gard. Edinb Y1 - 1975 A1 - H. Freitag SP - 341 EP - 408 VL - 33 ER -