Inflorescences of most of the Alismataceae have bracts in sets of three forming pseudowhorls (i.
A number of clear instances of this exist among the helobial monocotyledons, particularly in the Alismataceae and Limnocharitaceae.
This member of the Alismataceae provides an interesting illustration of the way in which vegetative features can be incorporated into an inflorescence as a regular feature of development.
While Luronium is only one example among many in the closely related families Alismataceae and Limnocharitaceae, in which vegetative buds occur within the inflorescence, it differs from almost all the others that have been described (Charlton, 1973; Charlton & Ahmed, 1973; Wilder, 1974a) in two ways.
Of the 33 aquatic families (representatives in about one-half have been tested), three (Isoetaceae,
Alismataceae, and Hydrocharitaceae) have evolved CAM, or 9% of the aquatic plant families.
