Morphological characteristics of angiosperm phylogeny problem two schools on the morphological characteristics of the oldest angiosperm question their original groups and evolutionary groups have long been a center of plant taxonomists research, the focus of debate, especially for angiosperms on the "flower" sources, the biggest disagreement, the formation of two schools, the so-called "fake flowers school" and "school of real flowers," or "the catkin School" and "Buttercup school."
German botanist Engler represented fake flowers doctrine that angiosperms and gymnosperms flower ball flower exactly, each stamen and carpel, respectively, representing an extreme degradation of male and female flowers, which envisaged quilt Plants are from the ephedra plant trees sub-class of curved handle ephedra ephedra campylopoda, as shown below, in this vision, the male becomes flower bracts, bracts into carpel female, each male bracteoles disappear After only one stamen, female bracteole only disappear after ovule, was born in the ovary base.
Because of gymnosperms, especially Ephedra and Gnetum with unisexual flowers, etc. are based, thus conceived is a primitive angiosperms unisexual flowers. This theory is called the theory of artificial flowers (pseudanthium theory). According to this, the modern primitive angiosperm taxa should have unisexual flowers, without being spent, wind-pollinated flowers and woody plants Ament, such as Casuarina mesh, mesh pepper, willow mesh and so on. This school of thought is opposed by most modern systems scientist, according to anatomy, pollen and other research data to show catkin class should be secondary groups. |
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