Lactuca


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Related to Lactuca: lactuca canadensis

Lactuca

 

a genus of plants of the family Compositae. They are annual, biennial, and perennial herbs; subshrubs are infrequently encountered. The heads are gathered into compact inflorescences, which are generally paniculate or racemose-paniculate. The fruit is an achene with a plumose pappus. There are more than 100 species, distributed in Europe and Africa; a few species are found in America. In the USSR there are approximately 20 species. Some species of the subgenus Mulgedium (sometimes classified in a special genus), such as Lactuca tatarica (Mulgedium tatarica) and prickly lettuce (L. serriola), are weeds. L. tatarica reproduces vegetatively. Prickly lettuce, a biennial or annual with yellow flowers and leaves that are nearly vertical, is a compass plant; in clear weather its leaves incline toward north and south. Some species of Lactuca, such as L. stricta and L. chaixii, contain a milky juice—lactucarium—that dries in the air. The most important species of this genus is garden lettuce (L sativa).

References in periodicals archive ?
lactuca showed the lowest and the highest values, respectively.
lactuca were 20.10 and 33.07, crude protein 21.5 and 17.2, lipids 4.45 and 1.7, nitrogen-free extract 32.4 and 38.34, respectively.
Ademas, el ALA de lodo residual posee una buena cantidad de hierro y supera en el contenido de fosforo y potasio al fertilizante de residuo de pescado y en fosforo y calcio al ensilado de Ulva lactuca. Por otro lado, el pH es acido (menor a 4) y la conductividad electrica es elevada como en los bioles elaborados por Bossio (2007), Peralta (2010) y Roman (2012).
Valarini, "Avaliacao da Contaminjao de Coliformes Fecais Em Alface (Lactuca Sativa), Agua de Irrigacao E Lavagem Em Sistemas de Producao Organica E Convencional," Revista Brasileira de Agroecologia, vol.
A combination of laboratory and field experiments was conducted with crabs collected in rocky cobble habitats in Moss Landing, CA (36.80715N, -121.78680W), where mussels (Mytilus galloprovincialis), algae (Ulva lactuca), and whelks (Nucella ostrina) were also collected.
lactuca; but another trend of substantial accumulation of Mn was shared by J.
In view of this fact, this paper evaluates the allelopathic activity of extracts from different organs of five Brazilian peanut (Arachis hypogaea L.) cultivars against lettuce (Lactuca sativa) and weed plants (Commelina benghalensis and Ipomoea nil).