TY - JOUR T1 - A fossilized aroid infructescence, Albertarum pueri gen.nov. et sp.nov., of Late Cretaceous (Late Campanian) age from the Horseshoe Canyon Formation of southern Alberta, Canada JF - Canadian Journal of Botany Y1 - 2005 DO - doi: 10.1139/B05-033 A1 - Bogner, J. A1 - Hoffman, G.L. A1 - Aulenback, K.R. SP - 591 EP - 598 KW - Albertarum KW - Araceae KW - fossil KW - Limnobiophyllum KW - Mayoa. KW - Symplocarpus AB -

A fossilized aroid infructescence has been recovered from the Horseshoe Canyon Formation in southern Alberta, Canada. Its stratigraphic position places it near the end of the Campanian Stage of the Late Cretaceous Epoch, at an absolute age of approximately 72 million years before present. It is one of the few Cretaceous aroid fossils known at present, and it represents a new genus of Araceae, here named Albertarum. The infructescence is fertile to the apex, and the flowers must have been bisexual. Flowers bear remains of a long, attenuated style, surrounded by a perigone of six tepals. A fracture reveals ellipsoid seeds with a thick, ribbed testa and traces of a raphe, arranged in groups of three. The gynoecium was probably trilocular with one ovule per locule, and ovules were anatropous, probably with apical–parietal or axile placentation. Bisexual, perigoniate flowers occur in subfamilies Gymnostachydoideae, Orontioideae, Pothoideae, Monsteroideae, and Lasioideae, no genera of which have ribbed seeds, but the infructescence and stylar region of Albertarum resemble those of extant Symplocarpus (Orontioideae). The Horseshoe Canyon Formation was deposited in a delta plain setting, and like Symplocarpus, Albertarum probably grew in a wetland environment.

PB - NRC Canada VL - 83 ER - TY - CHAP T1 - The first evolutionary classification of the Araceae: A. Engler’s Natural System T2 - Early events in Monocot evolution Y1 - 2013 A1 - Mayo, S.J. A1 - Bogner, J. KW - 19th century KW - A. Engler KW - Araceae KW - C.W. Nägeli KW - classification KW - evolutionary concepts KW - Vervollkommnungstheorie AB -

The development of A. Engler’s classification of the Araceae is described, focussing on the earliest versions published in the 1870s, the fruits of his innovative morphological and anatomical studies of the family during the time he worked in Munich. This shows that Engler was especially concerned with providing a new classification of the Araceae that, in contrast to that of Heinrich Schott, was explicitly founded on hypothetical evolutionary connections between the major taxa. Particular attention is given to Engler’s 1884 paper in which a detailed theoretical justification of his system is given and it is evident that by this time Engler’s interpretations of Araceae phylogeny had been influenced by C.W. Nägeli’s Vervollkommnungstheorie. The continuing significance of Engler’s work on aroids is highlighted.

JF - Early events in Monocot evolution PB - Cambridge University Press, The Systematics Association CY - Cambridge, UK ER - TY - CHAP T1 - Recent progress in the phylogenetics and classification of Araceae Y1 - 2013 DO - https://doi.org/10.1017/CB09781139002950.010 A1 - Mayo, S.J. A1 - Bogner, J. A1 - Cusimano, N. AB -

The aim of this paper is to review progress in phylogenetic research of Araceae during the period since publication of the first major molecular study by French et al. (1995).

ER - TY - JOUR T1 - Relationships within the Araceae: comparison of morphological patterns with molecular phylogenies Y1 - 2011 DO - doi:10.3732/ajb.1000158 A1 - Cusimano, N. A1 - Bogner, J. A1 - Mayo, S.J. A1 - Boyce, P.C. A1 - Wong, S.Y. A1 - Hesse, M. A1 - Hetterscheid, W.L.A. A1 - Keating, R.C. A1 - French, J.C. KW - Araceae KW - Calla KW - character evolution KW - classification KW - Lemnoideae KW - molecular phylogeny KW - phenotypic characterization AB -

• Premise of the study: The fi rst family-wide molecular phylogeny of the Araceae, a family of about 3800 published species in 120 genera, became available in 1995, followed by a cladistic analysis of morpho-anatomical data in 1997. The most recent and comprehensive family-wide molecular phylogeny was published in 2008 and included species from 102 genera. We reanalyzed the molecular data with a more complete genus sampling and compared the resulting phylogeny with morphological and anatomical data, with a view to contributing to a new formal classifi cation of the Araceae.
• Methods: We analyzed 113 aroid genera and 4494 aligned nucleotides that resulted from adding 11 genera to the 2008 molecular matrix. We also analyzed 81 morphological characters in the context of the molecular phylogeny, using an extended version of the 1997 morpho-anatomical data set.
• Key results: The resulting maximum-likelihood phylogeny is well resolved and supported, and most of the 44 larger clades also have morphological or anatomical synapomorphies as well as ecological or geographic cohesion. Of the 44 clades, 16 are here newly circumscribed and informally named. However, some relationships remain poorly supported within the Aroideae subfamily. The most problematic placement is Calla within Aroideae, which confl icts with the distribution of morphological, anatomical, and palynological character states.
• Conclusions: The comparison of the molecular analysis with morphological and anatomical data presented here represents an important basis for a new formal classifi cation for the Araceae and for the understanding of the evolution of this ancient family, a monocot group known in the fossil record from the early Cretaceous.

ER - TY - JOUR T1 - A revision of Alloschemone Schott (Araceae: Monstereae). Aroideana Y1 - 2001 A1 - Bogner, J. A1 - Boyce, P.C. A1 - Sakuragui, C.M. AB -

80-93

VL - 24 ER -