Chestnut which are mildly poisonous to humans. Nor should they be confused with water chestnut, which are tubers of an aquatic herbaceous plant in the sedge family Cyperaceae. Other trees commonly mistaken for chestnut trees are the chestnut oak ("Quercus prinus") and the American beech ("Fagus grandifolia"), both of which are also in the Fagaceae. The name "chestnut" is derived from an earlier English term "chesten nut", which descends from the Old French word "chastain" (Modern French, "châtaigne"). The French word in turn derives from Latin "Castanea" (also the scientific name of the tree), which traces to the Ancient Greek word
Luzula sylvatica Luzula sylvatica Luzula sylvatica, commonly known as greater wood-rush or great wood-rush, is a perennial flowering plant in the rush family Juncaceae. With regards to the etymology of the binomial, "Luzula" could come from the Italian "lucciola" ("to shine, sparkle") or the Latin "luzulae" or "luxulae", from "lux" ("light"), inspired by the way the plants sparkle when wet with dew; whilst "sylvatica" comes from silva, Latin for forest. "Luzula sylvatica" is the largest woodrush, with stems high. It forms clumps of bright green leaves which are glossy, flat, linear, about in length and wide; its leaves remain green or at