Vincenzo Petagna

Sansevieria is a historically recognized genus of flowering plants, native to Africa, notably Madagascar, and southern Asia, now included in the genus Dracaena on the basis of molecular phylogenetic studies. Common names for the 70 or so species formerly placed in the genus include mother-in-law's tongue, devil's tongue, jinn's tongue, bow string hemp, snake plant and snake tongue. In the APG III classification system, Dracaena is placed in the family Asparagaceae, subfamily Convallarioideae (formerly subfamily Nolinoideae); before that it was placed in family Ruscaceae. It has also been

Callitriche brutia, the pedunculate water-starwort, is a dwarf amphibious annual or perennial dicotyledon herb in the genus Callitriche. The common name of this species is water starwort. It colonizes aquatic environments, such as wetlands, lakes, rivers, streams, and pools, and it grows in oligotrophic conditions, meaning it grows in an environment that has little to sustain life. Pedunculate water-starwort was found in Ireland and England, but is now an invasive species due to its resistance to environmental stressors, and its ability to grow in still water.

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Ruppia cirrhosa (syn. Ruppia spiralis), spiral tasselweed, is a species of aquatic plant in the pondweed family, with a cosmopolitan distribution, that grows in brackish to saline waters. It has long, thin leaves that often form a dense layer under the surfaces of coastal ditches, lakes and lagoons. The flowers are tiny and petal-less, and produce pollen that is dispersed by the wind or floating on the water. The name refers to its ability to produce a long, coiled stalk to the fruiting inflorescence, which is not often seen.