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 sativa seeds are highly sensitive to climate conditions; thus, they are stored securely to maintain their qualitative and quantitative characteristics until their effective use (Villela et al.
The effect of cyanide compounds, fluorides and inorganic oxides present in spent pot liner on germination and root tip cells of Lactuca sativa.
Nevertheless, they may just exhibit this behavior at low tide and in situations when higher quality food such as juvenile invertebrates is not readily available, as experiments in the present study showed higher consumption of juvenile mussels and abalone compared with the seaweed Ulva lactuca (Fig.
The dominance of two Cystoseira species at the clean site (S1) and of Ulva lactuca at the polluted site (S3) is in agreement with [23] who reported that some species of Cystoseira are very sensitive to urban pollution; while Ulva spp.
So, we can compare the antitumor activities of Lactuca and Santolina and triterpene activity.
Todas as variaveis das plantulas (% de germinacao, comprimento e peso da materia seca) de Lactuca sativa apresentaram diferencas significativas a partir da primeira concentracao do extrato e foram nulas a partir de 15 % de concentracao (Tabela 2), sugerindo a presenca de aleloquimicos nas folhas de Nicotiana glauca.
Especies de otros generos de asteraceas tambien han sido mencionadas por su toxicidad para el hombre y los animales; entre ellos destacan los siguientes: Ambrosia, Anthemis, Arnica, Artemisia, Aster, Baileya, Barkleyanthus, Bidens, Cirsium, Conyza, Chromolaena, Elephantopus, Geigeria, Gutierrezia, Haplopappus, Helenium, Iva, Lactuca, Leucanthemum, Ligularia, Lygodesmia, Mikania, Packera, Parthenium, Pittocaulon, Psacalium, Psilostrophe, Rudbeckia, Sigesbeckia, Solidago, Sommerfeltia, Sonchus, Tagetes, Tanacetum, Telanthophora, Tetradymia, Trixis, Vernonia, Zexmenia, etc.
Yen Le TT, Vijver MG, Jan Hendriks A, Peijnenburg WJGM (2013) Modeling toxicity of binary metal mixtures (Cu2+-Ag+, Cu2+-Zn2+) to lettuce, Lactuca sativa, with the biotic ligand model.