Callitriche Stagnalis, Scop

The habitat of this plant is ponds and ditches. The habit is as in the last. The leaves are all similar, narrow at the base, inversely ovate to spoon-shaped, the floating leaves forming a rosette, which, however, may not develop. The flowers are as in the last, with sickle-like, persistent bracts. In flower the styles are erect and persistent, turned back in fruit. The fruit is nearly stalkless, with lobes winged on the back, twice as large as in C. verna, and when dry pale in colour. The lobes are slightly spreading. The plant is floating or submerged. Flowers may be found between April and September. The plant is a herbaceous annual or perennial.

Callitriche Polymorpha, Lonnr

The habitat of this plant is watery places. In habit the plant resembles C. stagnalis. The fruit, however, is not so large and is hardly winged. The lower leaves are linear, notched. The upper leaves are roundly spoon-shaped, and form a rosette. The flowers are as in the last, with sickle-like, persistent bracts. The fruit is as small as in C. verna. It is almost stalkless, with lobes scarcely winged on the back, and keeled. The style is erect in flower, turned back in fruit, very long, 2-3 times as long as the fruit. The plant is floating or submerged. It is in flower between June and September, and is a herbaceous annual or perennial.

Callitriche intermedia, Hoffm. (= C. hamulata, Kutz.). - The habitat of this plant is lakes and streams, etc. The plant has the Starwort habit. The leaves are linear, the upper broader in the middle, the uppermost oblong, spoon-shaped. The bracts overlap, and are hooked, and do not persist. The styles are long, spreading, and at length turned back over the side of the fruit. The pollen is more or less round. The fruit is stalkless, with a blunt dorsal ridge, flat one side, broader than long, the lobes are parallel with the dorsal ridge, and there is a shallow furrow. The plant is floating or submerged. It flowers between April and September, and is a herbaceous annual or perennial.

Callitriche Obtusangula, Le Gall

The habitat of this plant is ponds and ditches. The plant has the Starwort habit. The leaves, which are all inversely ovate, form a rosette. The bracts are persistent. The styles are spreading, or erect, and do not fall. The fruit is large, blunt, hardly stalked. The lobes are parallel with the rounded edges. The carpels are swollen, obtusely 3-angled on the back. The plant is floating or submerged. It is in flower between April and September, and is a herbaceous annual or perennial.

Callitriche Truncata, Guss

The habitat of this plant is ditches. The leaves are all of the same type, and are enlarged at the base, and linear. They are all submerged, very blunt at the end, and of a clear, green colour. There are no bracts. The styles are bent back or spreading. The fruit consists of 4 nearly equal lobes, and is shortly-stalked, the lobes having a blunt dorsal ridge, being keeled. The plant is floating or submerged. It flowers between June and September, and is a herbaceous annual or perennial.

Callitriche Autumnalis, L

The habitat of this plant is lakes, especially in North Britain. The leaves are all of the same type, enlarged below, linear, dark-green, submerged, blunt at the end. There are no bracts. The styles are spreading. The fruit is stalkless, four times as large as in C. verna, dark-brown, with one or two abortive lobes. The carpels are keeled or winged, united towards the axis only. The lobes have broad and acute wings on the back. The plant is submerged. It flowers between June and October, and is a herbaceous annual or perennial.