Sagittaria lancifolia, Photo: Michael Lahana
Sagittaria lancifolia is a perennial, monocot plant in the family Alismataceae, genus Sagittaria, with herbaceous growth patterns. It is native to the southeastern United States and westward through Texas. It is also known as "duck potato" because of the large potato-like corms which can form underground.
S. lancifolia reproduces both asexually through spreading rhizomes and sexually through reproduction of copious achenes, a dry fruit each of which carries a single seed. The achenes are dispersed through animal vectors and through hydrochory (dispersal through wind, water, or gravity). The achenes germinate only under light, and with or without available fluid, but the period of their germination is shorter when they are submersed in water. Temperature is a factor, with 100% germination occurring at 20 °C (68 °F). Germination is reduced in anaerobic conditions. Growth is also dependent on temperature.
Sensitivity to in-situ burning of applied crude oil
Louisiana is one of the top five U.S. states in oil production, oil that is piped through marshes in Louisiana to market and sometimes leaks into the marsh land polluting it. Field studies suggest that, although the application and burning of South Louisiana Crude oil on Sagittaria l. plants in plots of fresh Louisiana marsh land had short term negative effects on the growth rate of Sagittaria l., over time plant recovery was just as rapid as in the plots where the plants were oiled but not burned. This suggests that allowing a polluted marsh to degrade and recover without burning is a viable option, while burning is a viable option when a rapid recovery is needed on sensitive lands.
1. ^ "Plants: Profile for Sagittaria lancifolia (bulltongue arrowhead)". plants.usda.gov. http://plants.usda.gov/java/profile?symbol=SALA&mapType=nativity&photoID=sala_001_avp.tif. Retrieved 2009-12-22.
* "Sagittaria lancifolia in Flora of North America @ efloras.org". www.efloras.org. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=222000344. Retrieved 2009-12-22.
Source: Wikispecies, Wikipedia: All text is available under the terms of the GNU Free Documentation License