Plants

The Columbia Encyclopedia, 6th ed. A Dictionary of Plant Sciences Further reading

pickerelweed

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

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 Magnoliophyta , class Liliopsida, order Liliales.

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Pontederiaceae

A Dictionary of Plant Sciences | 1998 | | Copyright

Pontederiaceae (order Liliales) A family of monocotyledonous (see MONOCOTYLEDON) freshwater, aquatic plants. The leaves have sheathing bases, often petiolate. The flowers are blue, lilac, yellow or white, with 6 perianth segments, often borne in a showy inflorescence enclosed by a spathe-like sheath. The fruit is a capsule or nutlet. The free-floating water hyacinth (Eichhornia crassipes) is probably the world's most serious aquatic weed. Other species are grown as aquatic ornamentals. There are 7 genera, comprising 29 species, occurring in the tropics and subtropics, especially America.

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MICHAEL ALLABY. "Pontederiaceae." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Pontederiaceae." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O7-Pontederiaceae.html

MICHAEL ALLABY. "Pontederiaceae." A Dictionary of Plant Sciences. 1998. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-Pontederiaceae.html

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