Plant Portrait Halophila ovalis (Hydrocharitaceae) Ruth van Crevel, FM I, 5 (1957) 409, f.16
Herbarium specimen Hydrilla verticillata (Hydrocharitaceae) NHN Leiden
Flower Ottelia mesenterium (Hydrocharitaceae) Sulawesi Indonesia MMJ van Balgooy
Plant Portrait Najas tenuifolia (Hydrocharitaceae) FM I,6 (1962) 159, f.1.a
Plant Portrait Ottelia alismoides (Hydrocharitaceae) M.R. Henderson, Malayan wild flowers, Dicotyledons (1949-51, repr. 1974) 9