Metcalfe and Chalk (1957) give a limited description of Myriophyllum in the frame of other genera of the Haloragaceae. The present study characterizes the stem of two Myriophyllum species. The anatomical spectrum of the family is therefore not fully respected.
Wayne et al. (1964) studied the intra-annual development of the shoot apex.
Present features in relation to the number of analyzed species
IAWA code frequency
Total number of species
1 growth rings distinct and recognizable
2 growth rings indistinct or absent
2.1 only one ring
2.2 without secondary growth
9 vessels predominantly solitary
13 vessels with simple perforation plates
20 intervessel pits scalariform
22 intervessel pits alternate
50.1 100-200 vessels per mm2 in earlywood
60.1 fibers absent
98 rays commonly 4-10-seriate
127 intercellular canals
R2.1 groups of sieve tubes in radial rows
R14 cortex with aerenchyma
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