levels

Branched Bur-reed Sparganium erectum showing rhizomes, and plant with flowers and fruit.  Illustration also shows details of an individual fruit, and of a female and male flower.  

Arrowhead Sagittaria sagitarria showing underwater ribbon-like leaves and floating oval leaves.  Emergent leaves are arrow-shaped.  Illustration also shows flowers and fruit.

Broad-leaved Pondweed Potamogeton natans with detail of fruiting spike, one seed, and one flower.

Frog’s-bit Hydrocharis morsus-ranae showing plant with female flowers on the left, and one with male flowers on the right.  Illustration shows rhizomes as well as floating orbicular leaves and flowers.

Water horsetail showing two sterile stems and two fertile stems, one with leaves and one without.  Also showing cross section of the stem, and the rhizome.

Parrots Feather Myriophyllum aquaticum showing rosettes of leaves below water.  Also showing detail of the tiny flowers, and a vegetative and flowering spike.

Flowering rush Butomus umbellatus with details of individual flower, leaf cross section, stamen before and after dehiscence, and seedhead

Water plantain Alisma plantago-aquatica with details of fruit individual seed and one flower

Flowering rush Butomus umbellatus pencil drawing