#NEXUS
[!This data set was downloaded from TreeBASE, a relational database of phylogenetic knowledge. TreeBASE has been supported by the NSF, Harvard University, Yale University, SDSC and UC Davis. Please do not remove this acknowledgment from the Nexus file.


Generated on September 18, 2025; 20:48 GMT

TreeBASE (cc) 1994-2008

Study reference:
Crane P. 1985. Phylogenetic relationships in seed plants. Cladistics, 1: 329-348.

TreeBASE Study URI:  http://purl.org/phylo/treebase/phylows/study/TB2:S229]

[ The following blocks are input data for analysis step 171 ]
BEGIN TAXA;
        TITLE  TaxaForAnalysisStep171;
        DIMENSIONS NTAX=20;
        TAXLABELS
            Archaeopteris
            Bennettitales
            Callistophyton
            Caytonia
            Cordaixylon
            Corystosperms
            Cycads
            Ephedra
            Extant_Conifers
            Ginkgo
            Glossopterids
            Gnetum
            Lebachia
            Lyginopteris
            Medullosans
            Mesoxylon
            Peltasperms
            Pentoxylon
            Welwitschia
            angiosperms
            ;
END;

BEGIN CHARACTERS;
[! TreeBASE Matrix URI: http://purl.org/phylo/treebase/phylows/matrix/TB2:M590]

	TITLE Table_2;
	LINK TAXA = TaxaForAnalysisStep171;
	DIMENSIONS NCHAR=31;
	FORMAT DATATYPE=Standard SYMBOLS= "- +" MISSING=? GAP= N;

MATRIX
[                           10        20        30 ]
[                            .         .         . ]
Archaeopteris       +--N-N-NN---N--NNN-+N-NNN-----N
Bennettitales       +++++-+-++--N+-N-++++++++------
Callistophyton      +++++-++++--N+-N+---N-NNN-----N
Caytonia            +++++-++++--N+-N-++-----N-----N
Cordaixylon         +++++-+++--+++++----N-NNN-----N
Corystosperms       +++++-++++--N+-N-++++---N-----N
Cycads              ++++++---+--N+-N----N-NNN-----N
Ephedra             +++++-+-+---N+--+-++N+NNN---+++
Extant_Conifers     +++++-+++-++++--+---N-NNN-----N
Ginkgo              +++++-+-+--+N+-N----N-NNN-----N
Glossopterids       +++++-++++--N+-N-+------N-----N
Gnetum              ++++N-+--+--N+--+-++N-NNN+++-++
Lebachia            +++++-+++-+++-------N-NNN-----N
Lyginopteris        ++++--+--+--N--N---+N-N-N-----N
Medullosans         -++++++--+--N--N----N-NNN-----N
Mesoxylon           +++++-+++--++-++----N-NNN-----N
Peltasperms         +++++-+-++--N+-N----N---N-----N
Pentoxylon          +++++-+-++--N+-N-++++++++------
Welwitschia         ++++N-+-----N+--+-++N+NNN++++++
angiosperms         +++++-+--+--N+-N++++++--N+-----
;
END;

[ The following blocks are output data for analysis step 171 ]
BEGIN TREES;
      TITLE Tb4951;
      LINK TAXA = TaxaForAnalysisStep171;
      TREE Fig._2 = [&R] (Archaeopteris,(Lyginopteris,(Medullosans,Cycads,((((Cordaixylon,Mesoxylon),(Lebachia,Extant_Conifers)),Ginkgo),Callistophyton,Peltasperms,(Glossopterids,(Caytonia,(Corystosperms,((Bennettitales,Pentoxylon),(((Gnetum,Welwitschia),Ephedra)Gnetales,angiosperms))anthophytes))))))seed_plants);
[!  TreeBASE tree URI: http://purl.org/phylo/treebase/phylows/tree/TB2:Tr4332]


END;