The timing of the origin of angiosperms is a hotly debated topic in plant evolution. Molecular
dating analyses that consistently retrieve pre‐Cretaceous ages for crown‐group …

Angiosperms and their flowers have greatly diversified into an overwhelming array of forms
in the past 135 million years. Diversification was shaped by changes in climate and the …

Friedman WE, RC Moore, and MD Purugganan. 2004. The evolution of plant development.
Am. J. Bot. 91: 1726–1741. Friis EM, PR Crane, and KP Pedersen. 1997. Fossil history of …

Increasingly robust understanding of angiosperm phylogeny allows more secure
reconstruction of the flower in the most recent common ancestor of extant angiosperms and …

We have amassed structural data for 108 characters and 52 taxa of magnoliids and basal
monocots and eudicots, including observations by PK Endress and A. Igersheim on flowers …

Background Ovules as developmental precursors of seeds are organs of central importance
in angiosperm flowers and can be traced back in evolution to the earliest seed plants …

The construction of classifications, as well as the understanding of biological diversity,
depends upon a careful comparison of attributes of the organisms studied (Stuessy, 1990). It …

Familial, subfamilial, and tribal monophyly and relationships of aroids and duckweeds were
assessed by parsimony and Bayesian phylogenetic analyses of five regions of coding (rbcL …

Over the past 25 years, discoveries of Early Cretaceous fossil flowers, often associated with
pollen and sometimes with vegetative parts, have revolutionized our understanding of the …

This paper critically reviews the distribution of microsporogenesis types in relation to recent
concepts in monocot systematics. Two basic types of microsporogenesis are generally …