A cladistic analysis of Iris series Californicae based on morphological data
1998
Wilson, C.A.
A cladistic analysis of Iris included 18 ingroup taxa from series Californicae and two outgroup taxa from series Sibiricae. The analysis resulted in three most parsimonious trees of 78 steps, one of which had the topology of the strict consensus tree. Twenty-nine morphological, binary and multistate characters allowed resolution of 14 monophyletic clades. The long floral tube and short floral tube groups in series Californicae that have been informally proposed by previous workers were found to be polyphyletic as presently circumscribed. Iris tenax is polyphyletic and I. hartwegii may be paraphyletic as currently delineated. The inclusion of taxa of proposed hybrid origin (I. hartwegii subsp. pinetorum, I. h. subsp. columbiana and I. thompsonii) did not increase the homoplasy present on the morphology based tree nor did it effect the analysis outcome. The inclusion of a taxon proposed to be involved in introgressive hybridization (I. purdyi) increased the amount of homoplasy present but did not alter tree topology.
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