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#floral diagram

2 public questions tagged with this topic.

Plant Classification

In a floral diagram, the gynoecium is represented in the

Diagrammatic convention developed by Eichler and widely adopted places floral whorls concentrically reflecting early organogenesis sequence and mature topography. Outermost circle represents bract and bracteoles with triangular marks, next inner alternating whorl calyx with often stippled sepal symbols, then corolla petals, followed by androecium stamens with anther cross-sections, and center-most region denotes gynoecium with ovary transverse section showing number of carpels, locules, septa and ovule placentation type. Central position emphasizes gynoecium being evolutionarily conserved and

Ref: Ronse De Craene 2010 Floral Diagrams central gynoecium; Simpson

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Plant Classification

Which information cannot be obtained from a floral diagram?

Floral diagram provides schematic ground plan transverse section projection illustrating relative number of parts per whorl, degree of fusion connation and adnation, aestivation pattern valvate, twisted, imbricate or vexillary, and overall symmetry radial, bilateral or asymmetric. It depicts bract position, epicalyx, heterostemony and ovary placentation type parietal, axile or free central. However hereditary cytogenetic information such as chromosome count, karyotype, DNA sequence, ploidy level or genome size cannot be inferred from morphology alone. Diagrams serve comparative morphology and

Ref: Ronse De Craene Floral Diagrams Cambridge; Simpson Plant Systematics Ch Floral diagram

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