AMERICAN JOURNAL OF BOTANY

Volume 91, Number 7, July 2004

Invited Special Paper

Phylogenetic reconstruction of the evolution of stylar polymorphisms in                    
          Narcissus (Amaryllidaceae)

SEAN W. GRAHAM AND SPENCER C. H. BARRETT                                                    1007

Genetics and Molecular Biology

Molecular cytogenetic analysis of recently evolved Tragopogon (Asteraceae)                      
          allopolyploids reveal a karyotype that is additive of the diploid progenitors

J. CHRIS PIRES, K. YOONG LIM, ALES KOVARIK, ROMAN MATYASEK, AMY BOYD,
         ANDREW R. LEITCH, ILIA J. LEITCH, MICHAEL D. BENNETT, PAMELA S. SOLTIS,
         AND DOUGLAS E. SOLTIS                                                                                   1022

         Environmental and genetic effects on flowering differences between northern and southern
         populations of Arabidopsis Iyrata (Brassicaceae)

         MONA RIIHIMAKI AND OUTI SAVOLAINEN                                                              1036

Reproductive Biology

Herbivory alters the expression of a mixed-mating system

JANETTE A. STEETS AND TIA-L YNN ASHMAN                                                       1046

Reproductive ecology of distylous Palicourea padifolia (Rubiaceae) in a tropical
          montane cloud forest Hummingbirds' effectiveness as pollen vectors

JUAN FRANCISCO ORNELAS, LEONOR JIMENEZ, ClEMENTINA GoNzALEZ,AND
ANGELICA HERNANDEZ                                                                                      1052

          Reproductive ecology of distylous Palicourea padifolia (Rubiaceae) in a tropical
          montane cloud forest. II. Attracting and rewarding mutualistic and antagonistic visitors

JUAN FRANCISCO ORNELAS, ClEMENTINA GoNzALEZ, LEONOR JIMENEZ, CARLOS
          LARA, AND ARMANDO J. MARTINEZ                                                                      1061  

Systematics

Relationships of the Macaronesian and Mediterranean floras: molecular evidence
          for multiple colonizations into Macaronesia and back-colonization of the continent in
          Convolvulus (Convolvulaceae)

MARK A. CARINE, STEPHEN J. RUSSEll, ARNOlDO SANTOS-GUERRA, AND JAVIER
          FRANCiSCO-ORTEGA                                                                                         1070

Phylogenetic studies of Mammillaria (Cactaceae)-insights from chloroplast sequence
          variation and hypothesis testing using the parametric bootstrap

CHARLES A. BUTTERWORTH AND ROBERT S. WALLACE                                            1086

A molecular phylogenetic study of Graptopetalum (Crassulaceae) based on ETS,
          ITS, rp116, and trnL-F nu-cleotide sequences

RAUL ACEVEDO-RoSAS, KENNETH CAMERON, VICTORIA SOSA, AND SUSAN PELL          1099

Phylogeny and circumscription of the near-endemic Brazilian tribe Microlicieae
         (Melastomataceae)

PETER W. FRITSCH, FRANK ALMEDA, SUSANNE S. RENNER, ANGELA B. MARTINS,
         AND BONI C. CRUZ                                                                                            1105

Salvia (Lamiaceae) is not monophyletic: implications for the systematics, radiation,
          and ecological specializations of Salvia and tribe Mentheae

JAY B. WALKER, KENNETH J. SYTSMA, JENS TREUTlEIN, AND MICHAEL WINK                1115

Paleobotany

Duabanga-like leaves from the Middle Eocene Princeton chert and comparative                 
leaf histology of Lythraceae sensu lato

         STEFAN A. LITTLE, RUTH A. STOCKEY, AND RICHARD C. KEATING                              1126

Ecology

Incidence, size and spatial structure of clones in second-growth stands of coast
redwood, Sequoia semper- virens (Cupressaceae)

         VLADIMIR DOUHOVNIKOFF, ADELAIDE M. CHENG, AND RICHARD S. DODD                     1140

Population Biology

Seedling establishment and life history trade-offs in alpine plants

TARA A. FORBIS AND DANIEL F. DOAK                                                                  1147