Model shows the transverse and longitudinal section of a dicotyledonous stem in which case the cambium ring has been formed but no secondary growth has taken place.
Model, Stem Cross Section of Creeping Buttercup (Ranunculus repens), with collateral open vascular bundles, The model shows the typical stem structure of a dicotyledon enlarged by a factor of 250, Dimensions: 28 x 7 cm, weight: 3.25 kg