Thick water leaf

Thick water leaf
Water thick leaf ( Crassula aquatica )
Systematics
Nuclear eudicotyledons Order : Saxifragales (Saxifragales) Family : Thick-leaf family (Crassulaceae) Subfamily : Crassuloideae Genre : Thick leaf ( Crassula ) Type : Thick water leaf
Scientific name
Crassula aquatica
( L. ) Schönland

illustration

The water thick leaf ( Crassula aquatica ) is a species of the thick leaf family (Crassulaceae).

description

Crassula aquatica is an annual herbaceous succulent plant. Your upright to erect-creeping shoots are up to 10 centimeters long. The elliptically, lanceolate, pointed to blunt leaves reach a length of 3 to 6.5 millimeters.

From the nodes of the shoots a four-fold flower emerges, which sit on a flower stalk less than a millimeter long . The 0.6 to 0.9 millimeter long and 0.7 to 0.8 millimeter wide sepals are triangular to obtuse and occasionally covered with black, glandular points. Your rhombic-egg-shaped petals are about twice as long as the sepals and about 0.8 millimeters wide. The 0.8 millimeter long nectar flakes are thread-like spatula.

The seeds are elongated ellipsoidal, striped lengthways and tiny, wrinkled.

The number of chromosomes is 2n = 42.

Systematics and distribution

Crassula aquatica is common in northern and eastern Europe, northern Asia and northern America. The plants grow more or less submerged in the silt of the brackish water zone .

The first description as Tillaea aquatica was in 1753 by Carl von Linné in Species Plantarum . Selmar Schönland assigned the species to the genus Crassula in 1891 . A synonym is Tillaeastrum aquaticum (L.) Britton .

proof

literature

• Urs Eggli (ed.): Succulent lexicon. Crassulaceae (thick leaf family) . Eugen Ulmer, Stuttgart 2003, ISBN 3-8001-3998-7 , pp. 36 .

Individual evidence

1. ^ Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Verlag Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3131-5 . Page 480.
2. ↑ Species Plantarum . Volume 1, p. 128. Stockholm 1753, online
3. ↑ Engler, Prantl: Natural Plant Families . Part III, Department 2a, p. 37. Leipzig 1891

further reading

• WJ Cody: A history of Tillaea aquatica (Crassulaceae) in Canada and Alaska . In: Rhodora . Volume 56, pp. 96-100, 1954

Web links

Commons : Wasser-Dickblatt  - Collection of pictures, videos and audio files

• Thick water leaf. In: FloraWeb.de.
• Distribution map for Germany. In: Floraweb .
• Distribution in the northern hemisphere according to Eric Hultén
• photos