1. Baillon H 1891Histoire des plantes (Paris: Tom X)
2. Bentham G and Hooker J D 1862–1883Generaplantarum
2 (London: L Reeve and Co.)
3. Bureau E 1864Monographie des Bigttoniacèes (Paris: J B Bailliere et fils)
4. Campbell D H 1929 The phylogeny of the angiosperms;Bull. Torrey Bot. Club
55 479–497
5. Carlquist S 1969 Toward acceptable evolutionary interpretations of floral anatomy;Phytomorphology
19 332–362