@article {5613, title = {Comparative development of aseptate and septate anthers of Annonaceae}, journal = {American Journal of BotanyAmerican Journal of Botany}, volume = {90}, number = {6}, year = {2003}, month = {Jun}, pages = {832-848}, abstract = {We compared anther development in 13 genera and 15 species of Annonaceae to document the nature and development of anther septa. In aseptate anthers, all sporogenous initials proceed to sporogenesis and meiosis. In septate anthers, a small number of sporogenous initials, in a discontinuous distribution pattern, differentiate into sporogenous cells; the remaining initials become sterile and form cellular septa that partition each anther lobe into multiple sporangial chambers. In species where the septum is 1-2 cell layers thick, the entire septum becomes tapetal (T-type septa) and breaks down before anther dehiscence. In species in which the septum is three or more cell layers thick, only the layer in direct contact with the sporogenous cells becomes tapetal, and the remaining cells become parenchymatous (P-type septa). These thicker P-type septa are sometimes visible in dehisced anthers. Both types are homologous in ontogeny and are highly associated with the production of compound pollen. We propose that the evolution of anther septation in Annonaceae was mainly driven by the requirement for highly efficient nutrient and physical support to the development of large, compound pollen units.}, author = {Tsou, C. H. and Johnson, D. M.} } @article {5188, title = {Revision of Disepalum (Annonaceae)}, journal = {BrittoniaBrittonia}, volume = {41}, number = {4}, year = {1989}, month = {Oct-Dec}, pages = {356-378}, author = {Johnson, D. M.} } @article {5189, title = {A new species of Hornschuchia (Annonaceae) from atlantic Brazil, with comments on the circumscription of the genus Trigynaea}, journal = {Contributions from the University of Michigan HerbariumContributions from the University of Michigan Herbarium}, volume = {19}, year = {1993}, note = {088, 192}, pages = {259-263}, author = {Johnson, D. M. and R. de Mello-Silva} } @article {5190, title = {New Species of Guatteria (Annonaceae) from the Guayana Highland}, journal = {Annals of the Missouri Botanical GardenAnnals of the Missouri Botanical Garden}, volume = {77}, number = {3}, year = {1990}, pages = {598-600}, author = {Johnson, D. M. and Murray, N. A.} } @article {5191, title = {Four new species of Polyalthia (Annonaceae) from Borneo and their relationship to Polyalthia insignis}, journal = {Contributions from the University of Michigan HerbariumContributions from the University of Michigan Herbarium}, volume = {22}, year = {1999}, note = {148}, pages = {95-104}, author = {Johnson, D. M. and N. A. Murray} } @inbook {5192, title = {Annonaceae}, booktitle = {Nuevo cat{\'a}logo de la flora vascular de Venezuela}, year = {2008}, note = {007, 010, 024, 038, 041, 049, 055, 063, 071, 080, 081, 082, 086, 094, 128, 133, 152, 155, 156, 157, 167, 185, 192, 196, 206}, pages = {197-201}, publisher = {Fundaci{\'o}n Instituto Bot{\'a}nico de Venezuela Dr. Tobias Lasser}, organization = {Fundaci{\'o}n Instituto Bot{\'a}nico de Venezuela Dr. Tobias Lasser}, address = {Caracas}, author = {Johnson, D. M. and N. A. Murray and J. Murillo and P. J. M. Maas}, editor = {Omaira, H. and P.E. Berry and O. Huber} } @article {4984, title = {Molecular and morphological characterization of a new monotypic genus of Annonaceae, Mwasumbia, from Tanzania}, journal = {Systematic BotanySystematic Botany}, volume = {34}, number = {2}, year = {2009}, pages = {266-276}, author = {Couvreur, T.L.P and Van der Ham, R. W. J. M. and Mbele, Y.M. and Mbago, F. M. and Johnson, D. M.} } @article {4937, title = {New species from two unknown and highly threatened mountainous areas in northwestern Madagascar: the Galoka and Kalabenono massifs}, journal = {CandolleaCandollea}, volume = {64}, year = {2009}, note = {206}, pages = {179-202}, author = {Callmander, M.W. and Rakotovao, C. and Razafitsalama, J. and Phillipson, P.B. and Buerki, S. and Hong-Wa, C. and Rakotoarivelo, N. and Andriambololonera, S. and Koopman, M.M. and Johnson, D. M. and Deroin, T. and Andriamandranto, R. and Solo, S. and Labat, J.-N. and Lowry II, P.P.} } @article {4917, title = {A new species of Xylopia (Annonaceae) from Southern Venezuela}, journal = {NovonNovon}, volume = {3}, year = {1993}, note = {206}, pages = {99-101}, author = {Berry, P. E. and Johnson, D. M.} } @article {4900, title = {Taxonomy of Xylopia barbata (Annonaceae) and related species from the Amazon/Orinoco Region}, journal = {Contributions from the University of Michigan HerbariumContributions from the University of Michigan Herbarium}, volume = {22}, year = {1999}, note = {206}, pages = {21-28}, author = {Bagstad, K. J. and Johnson, D. M.} } @article {84, title = {New species of Xylopia and Uvaria (Annonaceae) from Tanzania}, journal = {Novon}, volume = {9}, year = {1999}, pages = {55-60}, author = {Johnson, D. M. and Mwasumbi, L.B. and Mbago, F. M.} } @article {56, title = {Molecular and morphological characterization of a new monotypic genus of Annonaceae, Mwasumbia, from Tanzania}, journal = {Systematic Botany}, volume = {34}, number = {2}, year = {2009}, pages = {266-276}, author = {Couvreur, T.L.P. and Van der Ham, R. W. J. M. and Mbele, Y.M. and Mbago, F. M. and Johnson, D. M.} }