Structure and evolution of the androecium in the Malvatheca clade (Malvaceae s.l.) and implications for Malvaceae and Malvales

摘要: Androecial development and structure as well floral vasculature of six selected species Bombacoideae several smaller lineages the Malvatheca clade (Malvaceae s.l.) were studied. All studied taxa share a similar pattern androecial development: initially, five antepetalous/antetepalous alternipetalous/alternitepalous primary primordia develop on ring wall. Two elongate secondary form each sector. At anthesis androecium consists an tube crowned by lobes. Each these lobes is developmental product primordium its two neighbouring primordia. The elongate, sessile units are positioned along lateral margins in distal part tube. Seen light most recent studies phylogeny Malvaceae Malvales whole, our data indicate that i) ancestral clade, ii) obdiplostemonous ground plan synapomorphy for Malvaceae, iii) diplostemony likely Malvales.