Pistia

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Pistia

 

a genus of plants of the family Araceae. There is one species, the water lettuce (P. stratiotes), which is a free-floating or sometimes rooted aquatic plant with rosettes of wedge-shaped, downy, light green leaves that fold up at night. New leaf rosettes develop from the axillary buds. The flowers are unisexual and naked; they are in small spadices surrounded by a whitish spathe. In the lower part of the spathe there is one pistillate flower with several male flowers above it. (Each male flower consists of two fused stamens.) The water lettuce is found in the tropics and subtropics of both hemispheres, mainly in freshwaters. It is cultivated in fishponds and aquariums. In China the plants are used as swine feed.

References in periodicals archive ?
Respecto a la presencia de alcaloides, se observa en la tabla 7 que en el control solo da positiva la prueba cualitativa que indica presencia de alcaloides polares en la Pistia stratiotes y negativa para las tres especies respecto a alcaloides no polares.
azurea, Oxycaryum cubense, Talia multiflora, Salvinia biloba, Pistia stratiotes, Ludwigia peploides and Nymphaea prolifera.
Analisis comparativo de la remocion de un sustrato organico por las macrofitas pistia stratiotes y egeria densa en un sistema batch.
El aumento de las poblaciones de especies acuaticas como Pistia stratiotes, Eichhornia crassipes, y Lemna gibba, son posibles consecuencia de un exceso de nutrientes que llegan al humedal por actividades agricolas y ganaderas lo que puede estar ocurriendo en el Humedal Santa Rosa.
La actividad agricola no solo ocasiona la presencia de especies invasoras en el humedal, tambien afecta a la comunidad de plantas acuaticas, probablemente aportando nutrientes a la laguna, los cuales llegarian por escorrentia desde los campos de cultivo adyacentes, cuando estos son fertilizados y regados, causando el incremento de las poblaciones de especies acuaticas como; Pistia stratiotes, Eichhornia crassipes y Lemna gibba los cuales actualmente destacan por la alta densidad poblacional cubriendo gran parte de los cuerpo de agua del humedal.
Solms and Pistia stratiotes Linneus], especially downstream of urban area and villages during the rainy season.
Macrophytes, Eichhornia crassipes and Pistia stratiotes, were placed at a ratio of 1: 1 so as to cover 50% of the surface of each tank; this area was delimited by a wire tied to the sides of the tank.
Bioconcentration factor of Pistia stratiotes for Cu and Ni was 140.
Summary: The non-polar compounds of the Pistia stratiotes were extracted using n-hexane as solvent.
PARATYPES: 5 [female] [female] macropters, 3 [female] [female] brachypters and 2[male] [male] macropters and 5 [male] [male] brachypters, same data; 1 [male] and 1[female] brachypter, Rio Hondo (S 27[degrees] 30' 29"; W 64[degrees] 54' 09"), Santiago del Estero 28-VIII-2011 on Pistia stratiotes Cabrera Walsh, col.
The sampling site was established near the campsite of the park, in a zone of the river with very slow current, semi-exposed to insolation (gallery forest on the margins), muddy bottom, and completely covered by floating vegetation, mainly Pistia stratiotes, accompanied by Eichhornia sp.