@article {erkens_revisions_2017,
	title = {Revisions of Ruizodendron and Pseudephedranthus (Annonaceae) including a new species and an overview of most up-to-date revisions of Neotropical Annonaceae genera},
	journal = {PhytoKeys},
	volume = {86},
	year = {2017},
	pages = {75{\textendash}96},
	abstract = {We present revisions of the Neotropical genera Ruizodendron and Pseudephedranthus (Annonaceae). Ruizodendron includes a single species R. ovale. Pseudephedranthus now comprises two species, with the description of the new species P. enigmaticus sp. nov. extending the range of the genus beyond the Upper Rio Negro region of Brazil (Amazonas) and adjacent Venezuela (P. fragrans), to include Guyana, Suriname, and the Brazilian state of Par{\'a}. An overview is provided of current revisions of Neotropical Annonaceae genera that will aid in accessing proper species information for this frequently encountered tropical rain forest family.},
	issn = {1314-2003},
	doi = {10.3897/phytokeys.86.13773},
	url = {https://phytokeys.pensoft.net/article/13773/},
	author = {Erkens, Roy and Oosterhof, Jessica and Westra, Lubbert Y. Th and Maas, Paul J. M.}
}
@article {pirie_taxonomic_2018,
	title = {A taxonomic revision of the Neotropical genus Cremastosperma (Annonaceae), including five new species},
	journal = {PhytoKeys},
	volume = {112},
	year = {2018},
	pages = {1{\textendash}141},
	abstract = {We present a taxonomic revision of Cremastosperma, a genus of Neotropical Annonaceae occurring in lowland to premontane wet forest, mostly in areas surrounding the Andean mountain chain. We recognise 34 species, describing five as new here: from east of the Andes, C. brachypodum Pirie \&amp; Chatrou, sp. nov. and C. dolichopodum Pirie \&amp; Maas, sp. nov., endemic to Peru; C. confusum Pirie, sp. nov., from southern Peru and adjacent Bolivia and Brazil; and C. alticola Pirie \&amp; Chatrou, sp. nov., at higher elevations in northern Peru and Ecuador; and from west of the Andes, C. osicola Pirie \&amp; Chatrou, sp. nov. endemic to Costa Rica, the most northerly distributed species of the genus. We provide an identification key, document diagnostic characters and distributions and provide illustrations and extensive lists of specimens, also presenting the latter in the form of mapping data with embedded links to images available online. Of the 34 species, 22 are regional endemics. On the basis of the extent of occurrence and area of occupancy of species estimated from the distribution data, we designate IUCN threat categries for all species. Fourteen species proved to be endangered (EN) and a further one critically endangered (CR), reflecting their rarity and narrow known distributions.},
	issn = {1314-2003},
	doi = {10.3897/phytokeys.112.24897},
	url = {https://phytokeys.pensoft.net/article/24897/},
	author = {Pirie, Michael D. and Chatrou, Lars W. and Maas, Paul J. M.}
}
@article {maas_twelve_2019,
	title = {Twelve new and exciting Annonaceae from the Neotropics},
	journal = {PhytoKeys},
	volume = {126},
	year = {2019},
	month = {jul},
	pages = {25{\textendash}69},
	abstract = {As a result of concerted efforts of the community of Annonaceae taxonomists, increasingly detailed knowledge of the diversity of the Neotropical genera has been documented. With the exception of just two large genera, Annona and Xylopia, all Neotropical Annonaceae have been revised within the last 25 years. Subsequent to these publications, many new specimens have been collected and sent to us in Leiden for identification. These included a number that, despite the advanced state of taxonomic knowledge, proved to represent rarely collected, undescribed species. Here we describe 12 new species of Annona, Guatteria, Klarobelia, Tetrameranthus, and Xylopia. These species serve to illustrate the still underestimated diversity of the Neotropical flora, even in well studied plant groups like Annonaceae.},
	issn = {1314-2003},
	doi = {10.3897/phytokeys.126.33913},
	url = {https://phytokeys.pensoft.net/article/33913/},
	author = {Maas, Paul J. M. and Westra, Lubbert Y. Th and Chatrou, Lars W. and Verspagen, Nadja and Rainer, Heimo and Zamora, Nelson A. and Erkens, Roy H. J.}
}
