Electronic Flora of South Australia Family Fact Sheet
Phylum Magnoliophyta – Subphylum Seagrasses – Class Liliopsida
Plants herbaceous, more or less aquatic. Vascular system generally not strongly lignified, often much reduced; vessels confined to the roots or wanting. Leaves simple. Perianth frequently much reduced or absent; gynoecium mostly apocarpous, sometimes monocarpous (except in Hydrocharitales where carpels are weakly united to form a compound ovary); endosperm absent in most taxa; pollen trinucleate.
Taxonomic notes: Two of the five orders are represented by seagrasses in southern Australia.
References: The Marine Benthic Flora of Southern Australia Part I
Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
©Board of the Botanic Gardens and State Herbarium, Government of South Australia
KEY TO ORDERS OF SEAGRASSES
1. Leaves differentiated into a petiole and blade. Flowers bracteate. Perianth in 1 or 2 whorls, each of 3 free segments. Carpels (2–)
1. Leaves linear to terete with a sheathing base, not differentiated into a petiole and a blade. Flowers usually ebracteate (bracts if present small and inconspicuous). Perianth when present generally much modified, never with distinct sepals and petals. Carpels 1-several, free, ovary superior
State Herbarium of South Australia