The development of labelled flowers of three species of Nymphaeaceae grown in outdoor concrete tanks situated near the university area, was followed by means of daily observations. The duration of the prefloral, floral s.s. and postfloral stages is shown in table 1.

Acta botanica neerlandica

CC BY 3.0 NL ("Naamsvermelding")

Koninklijke Nederlandse Botanische Vereniging

G. van der Velde. (1986). Developmental stages in the floral biology s.l. of Dutch Nymphaeaceae (Nymphaea alba L., Nymphaea candida Presl, Nuphar lutea (L.)Sm.). Acta botanica neerlandica, 35(2), 111–113.