TextTree example with properties

reference.bib

@book {SysNat,
    author    = "Carl Linnaeus",
    title     = "Systema naturae : per regna tria natura, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis.",
    publisher = "Impensis direct. Laurentii Salvii",
    address   = "Holmiae (Stockholm)",
    year      = 1766,
    volume    = 1,
    edition   = "12th",
    pages = {1--532}
}

 @article{Droege_2016, 
    title={The Global Genome Biodiversity Network (GGBN) Data Standard specification}, 
    volume={2016}, 
    ISSN={1758-0463}, 
    url={http://dx.doi.org/10.1093/database/baw125}, 
    DOI={10.1093/database/baw125}, 
    journal={Database}, 
    publisher={Oxford University Press (OUP)}, 
    author={Droege, G. and Barker, K. and Seberg, O. and Coddington, J. and Benson, E. and Berendsohn, W. G. and Bunk, B. and Butler, C. and Cawsey, E. M. and Deck, J. and et al.}, 
    year={2016}, 
    pages={baw125}
}

@article{Frank_1970, 
    title     = {The Structure of Ordinary Water: New data and interpretations are yielding new insights into this fascinating substance}, 
    volume    = {169}, 
    ISSN      = {1095-9203}, 
    url       = {http://dx.doi.org/10.1126/science.169.3946.635}, 
    DOI       = {10.1126/science.169.3946.635}, 
    number    = {3946}, 
    journal   = {Science}, 
    publisher = {American Association for the Advancement of Science (AAAS)}, 
    author    = {Frank, H. S.}, 
    year      = {1970}, 
    month     = {Aug}, 
    pages     = {635–641}
}

taxonomy.txtree

Plantae [kingdom]
  Magnoliopsida [class]
    Sapindales [order]
      Sapindaceae [family]
        Acer [genus]
          Acer negundo [species] {PUB=SysNat REF=Frank_1970,Droege_2016 VERN=de:Eschen-Ahorn,en:Box elder,en:Manitoba maple ENV=terrestrial}
            Acer negundo subsp. mexicanum (DC.) Wesm. [subspecies]
            Acer negundo subsp. mexicanum (DC.) Wesm. [subspecies]
            Acer negundo subsp. negundo [subspecies]
              *Negundo aceroides (L.) Moench [species]
              *Negundo aceroides Torr. [species]
              *Negundo aceroides subsp. interius (Britton) T.Love & D.Love [subspecies]
            Acer negundo var. californicum (Torr. & Gray) Sarg. [variety]
              *$? californicum Torr. & A.Gray
              *Negundo aceroides var. californicum (Torr. & A.Gray) Sarg. [variety]
            Acer negundo var. negundo [variety]
            Acer negundo var. violaceum (G. Kirchn.) H. Jaeger [variety]
              *$Negundo aceroides var. violaceum G.Kirchn. [variety]
              *Acer violaceum (Kirchn.) Simonkai [species]
              *Negundo aceroides subsp. violaceum (Booth ex Kirchn.) Holub [subspecies]   # do we need to capture both?
              *Negundo aceroides subsp. violaceus (Kirchner) W.A. Weber [subspecies]
        Negundo Moench [genus]
  Aceraceae [family]
    Negundo Boehm. [genus]