Discussion in relation to previous studies

Mikesell (1979) summarizes the results of the previous studies of Metcalfe and Chalk (1950), Chalk and Chattaway (1937) and Pfeiffer (1926). Mikesell (1979) and Carlquist (2000) studied in detail the ontogenic development of the primary thickening meristem of Phytolacca americana.

The results of the present study agree with the studies from Mikesell (1979) and Carlquist (2000).

Present features in relation to the number of analyzed species

IAWA code frequency

Total number of species

2 growth rings absent 9 vessels predominantly solitary 11 vessels predominantly in clusters 13 vessels with simple perforation plates 41 earlywood vessels: tangential diameter 50-100 pm 50.1 100-200 vessels per mm2 in earlywood 61 fiber pits small and simple to minutely bordered

(<3 pm = libriform fibers) 70 fibers thin- to thick-walled 79 parenchyma paratracheal 99 rays commonly >10-seriate 105 ray: all cells upright or square 133 successive cambia, Caryophyllaceae type 149 rhaphides present R10 phloem not well structured fD O

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