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White-stemmed Pondweed
Potamogeton praelongus
About White-stemmed Pondweed (Potamogeton praelongus) 0 Nurseries Carry This Plant Potamogeton praelongus, commonly known as whitestem pondweed in North America and Long-stalked Pondweed in Britain, is a large, perennial aquatic plant in the family Potamogetonaceae. It is widely distributed in lakes and rivers in the northern hemisphere, but is sensitive to poor water quality. Potamogeton praelongus has a Holarctic distribution, occurring in northern Europe (Britain, Ireland, Iceland, Scandinavia, Germany, Switzerland, France, Poland, Russia, the Baltic States), Greenland, Asia (Siberia, China, Korea, Japan), North America (northern USA, Canada). There are outlying populations in the Caucasus, Pyrenees and western USA. Ecological Requirements and Ecological Requirements. P. praelongus requires clear, deep water with at least some basic influence, and rarely grows in water less than 1 m deep. In Britain is usually found in lakes with limestone, marl or basalt geology, and it is absent from acidic lakes such as are common in Wales. It also occurs in slow-flowing rivers and disused canals. Long-stalked pondweed tends to be a rather rare plant within its range; for example, in a study of more than 3,500 British lakes, it occurred in only 88, most of which had low-moderate alkalinity and were dominated by isoetids. The seeds require a cold period to encourage germination.
Plant Description
Plant Type
Plant Type
Perennial herb


Growth Rate
Growth Rate

Flower Color
Flower Color

Flowering Season
Flowering Season

Landscaping Information
Natural Setting
Annual Precipitation: 33.7" - 120.2", Summer Precipitation: 1.21" - 4.08", Coldest Month: 25.6" - 33.9", Hottest Month: 47.9" - 62.6", Humidity: 0.96" - 17.75", Elevation: 1987" - 10194"

Alternative Names
Common Names: Whitestem Pondweed

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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