Is lack of cycad (Cycadales) diversity a result of a lack of polyploidy?

Chromosomal fission accounts for small-scale radiations in Zamia (Zamiaceae; Cycadales)

(2011) KRYSTLE OLSON et al.   BOTANICAL JOURNAL OF THE LINNEAN SOCIETY

Polyploidy and angiosperm diversification

(2009) Douglas E. Soltis et al.   AMERICAN JOURNAL OF BOTANY

Is the anthophyte hypothesis alive and well? New evidence from the reproductive structures of Bennettitales

(2009) Gar W. Rothwell et al.   AMERICAN JOURNAL OF BOTANY

A phylogenetic classification of the land plants to accompany APG III

(2009) MARK W. CHASE et al.   BOTANICAL JOURNAL OF THE LINNEAN SOCIETY

An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III

(2009)   BOTANICAL JOURNAL OF THE LINNEAN SOCIETY

The Jurassic fossil plant record of the UK area

(2009) Johanna H.A. van Konijnenburg-van Cittert   PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION

Plants with double genomes might have had a better chance to survive the Cretaceous-Tertiary extinction event

(2009) J. A. Fawcett et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

The meaning of Darwin's “abominable mystery”

(2008) William E. Friedman   AMERICAN JOURNAL OF BOTANY

Darwin's second “abominable mystery”: Why are there so many angiosperm species?

(2008) William L. Crepet et al.   AMERICAN JOURNAL OF BOTANY

Quantifying and comparing mating systems using normalized mutual entropy

(2008) Susan M. Bertram et al.   ANIMAL BEHAVIOUR

Origin and Early Evolution of Angiosperms

(2008) Douglas E. Soltis et al.   Annals of the New York Academy of Sciences

EVOLUTION OF POLYPLOIDY AND THE DIVERSIFICATION OF PLANT–POLLINATOR INTERACTIONS

(2008) John N. Thompson et al.   ECOLOGY

Novelties of the flowering plant pollen tube underlie diversification of a key life history stage

(2008) J. H. Williams   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Pattern and timing of diversification in Yucca (Agavaceae): specialized pollination does not escalate rates of diversification

(2007) C. I. Smith et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES