pickerelweed

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pickerelweed,

common name for the Pontederiaceae, a family of chiefly tropical perennial aquatic herbs found in freshwater. The pickerelweeds (genus Pontederia) range north into temperate regions, including most of the E United States and Canada. The water hyacinth (Eichhornia crassipes), a native of tropical America, has spread widely and is so prolific that it has clogged many waterways in the S United States and in other areas, including Java, Australia, and the Great Lakes region of E Africa. It is sometimes cultivated in tanks and ponds for its ornamental foliage and blue-violet flowers. The pickerelweed family is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Liliopsida, order Liliales.
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Trimorphic incompatibility in Mexican populations of Pontederia sagittata Presl.
Stigmatic pollen loads in populations of Pontederia cordata from the southern U.
Visitantes florales y esfuerzo reproductivo de Pontederia sagittata C.
The energy cost of bee pollination for Pontederia cordata (Pontederiaceae).
Pollen removal from tristylous Pontederia cordata: effects of anther position and pollinator specialization.
The movement patterns of carpenter bees Xylocopa micans and bumblebees Bombus pennsylvanicus on Pontederia cordata inflorescences.
stelligerum (Figure 3A, B and C), the resulting pattern is classified as the type espansigeny honeycomb, while, in Eichhornia azurea and Pontederia cordata (Figure 4C and D), as the type expansigeny radial.
In Sagittaria montevidensis and Pontederia cordata, these grooves are less evident and, in the young roots of Echinodorus grandiflorus, very evident.
This thickening of the first layers that start from the endoderm can be observed in Eichhornia azurea (Figure 4C), Pontederia cordata (Figure 4D), Oxycaryum cubense (Figure 5B) and Sagittaria montevidensis (Figure 6D).
It is interrupted by phloem poles in Sagittaria montevidensis (Figure 6B), Eichhornia azurea (Figure 4C), Pontederia cordata (Figure 4D) and Echinodorus grandiflorus (Figure 8B), however it is continuous in Polygonum hydropiperoides (Figure 3E).
In the other species, the xylem poles are in variable number, from five to six in Pontederia cordata (Figure 4D); eight in Sagittaria montevidensis (Figure 6D), from nine to ten in Eichhornia azurea (Figure 4C), eleven in Echinodorus grandiflorus (Figure 7B and C), and twelve in Oxycaryum cubense (Figure 5B).
Cortical development in roots of the aquatic plant Pontederia cordata (Pontederiaceae).