Phylogenetic tree of plants obtained by comparison of 18S rRNA signatures. (6-letter words – χ2 metric). The bootstrap coefficients (500 sets) of principal groups are indicated. The species class names are indexed by a code: A – Angiosperm, C – Conifer, G – Gnetale, Cyca – Cycad, F – Fern, M – Moss, L – Lycophyte, Lw – Liverwort, Hw – Hornwort. (see annex for the correspondence code/species).
Chapus et al. BMC Evolutionary Biology 2005 5:63 doi:10.1186/1471-2148-5-63