JURASSIC FLORAS
PENTOXYLON
Bose, M.N., P.K. Pal and T.M. Harris. 1985. The Pentoxylon plant. Phil. Trans. Roy. soc. London 310B: 77-108.
Crane, P.R. 1985. Phylogenetic analysis of seed plants and the origin of angiosperms. Annals of the Missouri Botanical Garden 72:716-793.
Crane, P.R. 1988. Major clades and relationships in the "higher" gymnosperms. In: Beck, C.B. ed. Origin and evolution of gymnosperms. Columbia University Press.
Osborn, J.M., T.N. Taylor and P.R. Crane. 1991. The ultrastructure of Sahnia pollen (Pentoxylales). Amer. J. Bot. 78: 1560-1569.
Rothwell, G.W. and R. Serbet. 1994. Lignophyte phylogeny and the evolution of spermatophytes: A numerical cladistic analysis. Systematic Botany 19: 443-482.
Sahni, B. 1948. The Pentoxyleae: a new group of Jurassic gymnosperms from the Rajmahal Hills of India. Botanical Gazette 110: 47-80.
Srivastava, B.P. 1935. On silicified plant remains from the Rajmahal series of India. Proceedings of the 22th Indian Science Congress, Calcutta, p. 285.
Srivastava, B.P. 1937. Studies on some silicified plant remains from the Rajmahal series. Proceedings of the 24th Indian Congress, Hyderabad-Deccan, pp. 273-274.
Srivastava, B.P. 1946. Silicified plant remains from the Rajmahal series of India. Proceedings of the National Academy of Science (India), 15, 185-211.
Stewart, W.N. 1976. Polystely, primary xylem and the Pteropsida. Lucknow, India: Birbal Sahni Institute of Palaeobotany.
Vishnu-Mittre. 1952. A male flower of the Pentoxyleae with remarks on the structure of the females cones of the group. Palaeobotanist 2: 75-84.
CYCADEOIDS (BENNETTITALES OR CYCADEOIDALES)
Bose, M.N. 1968. A new species of Williamsonia from the Rajmahal Hill, India. J. Linn. Soc. Bot. 61: 121-127.
Burger, W. and R. Liesner. 1969. Cycadeoidea: Did this flower ever bloom? Bull. Field Museum Nat. Hist. 40:6: 1-4.
Crane, P.R. 1986. The morphology and relationships of the Bennettitales. In: R.A. Spicer and B.A. Thomas eds. Systematics and Taxonomic Approaches in Paleobotany. The Systematics Association Special Volume No. 31. Oxford, Clarendon Press.
Crepet, W.L. 1972. Investigations of North American cycadeoids: pollination mechanisms in Cycadeoidea. Amer. J. Bot. 59: 1048-1056.
Crepet, W.L. 1974. Investigations of North American cycadeoids: the reproductive biology of Cycadeoidea. Palaeontographica B 148: 144-169.
Crepet, W. L. and T. Delevoryas. 1972. Investigations of North American cycadeoids: early ovule ontogeny. Amer. J. Bot. 59: 209-215.
Delevoryas, T. 1959. Investigations of North American cycadeoids: Monanthesia. Amer. J. Bot. 46: 657-666.
Delevoryas, T. 1960. Investigations of North American cycadeoids: trunks from Wyoming. Amer. J. Bot. 47: 778-786.
Delevoryas, T. 1963. Investigations of North American cycadeoids: cones of Cycadeoidea. Amer. J. bot. 50: 45-52.
Delevoryas, T. 1965. Investigations of North American cycadeoids: microsporangiate structures and phylogenetic implications. Palaeobotanist 14: 89-93.
Delevoryas, T. 1968a. Investigations of North American cycadeoids: structure, ontogeny, and phylogenetic considerations of cones of Cycadeoidea. Palaeontographica B 121: 122-133.
Delevoryas, T. 1968b. Some aspects of cycadeoid evolution. J. Linn Soc. Bot. 61: 137-146.
Harris, T.M. 1932. The fossil flora of Scoresby Sound East Greenland. Part 2. Description of seed plants incertae sedis together with a discussion of certain cycadophyte cuticles. Meddel. Grønland 85:5: 1-133.
Harris, T.M. 1944. A revision of Williamsoniella. Phil. Trans. Roy. Soc. London. B. 231: 313-328.
Harris, T.M. 1964. The Yorkshire Jurassic Flora. III. Bennettitales. London: British Museum (Natural History).
Sahni, B. 1932. A petrified Williamsonia (W. sewardiana, sp. nov.) from the Rajmahal Hills, India. Palaeontologica Indica n.s. 20:1-19.
Sharma, B.D. 1977. Indian Williamsonias-an illustrated review. Acta Palaeobotanica 18: 19-29.
Sitholey, R.V. and M.N. Bose. 1953. Williamsonia santalensis sp. nov. - a male fructification from the Rajmahal Series, with remarks on the structure of Ontheanthus polyandra Ganju. The Palaeobotanist 2: 29-39.
Thomas, H.H. 1915. On Williamsoniella, a new type of bennettitalean flower. Phil. Trans. Roy. Soc. London. B. 207: 113-148.
Thomas, H.H. and N. Bancroft. 1913. On the cuticles of some recent and fossil cycadean fronds. Trans. Linnean Soc. (Bot.) 8: 155-204.
Watson, J. and C.A. Sincock. 1991. Bennettitales of the English Wealden. Palaeontograph. Soc. Monogr. Publ. No. 588: 1-228.
Wieland, G.R. 1906. American Fossil Cycads. Carnegie Institution of Washington (Pub. 34). Washington, D.C.
Wieland, G.R. 1916. American Fossil Cycads. Volume II. Taxonomy. Carnegie Institution of Washington, Washington, D.C.