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Lobelia dortmanna
''Lobelia dortmanna'' (Dortmann's cardinalflower or water lobelia) is an aquatic stoloniferous herbaceous perennial aquatic plant with basal rosettes, and flower stalks growing to 70–200 cm tall. The flowers are 1–2 cm long, with a five-lobed white to pale pink or pale blue corolla, produced one to ten on an erect raceme held above the water surface. The fruit is a capsule 5–10 mm long and 3–5 mm wide, containing numerous small seeds.〔BorealForest: (''Lobelia dortmanna'' )〕〔Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. ISBN 0-340-40170-2〕
The leaves are linear to oblong, 2.5–7.5 cm long and evergreen. They have no functional stomata.〔Sculthorpe, C. D. (1967). The Biology of Aquatic Vascular Plants. Reprinted 1985 Edward Arnold, by London. p. 114.〕 It is one of several unrelated species of plants from low nutrient lakes known as isoetids, owing to their superficial similarity to Isoetes.〔Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. p. 26〕 The plant has the unusual ability of removing carbon dioxide from the rooting zone rather than from the atmosphere.〔Wium-Anderson, S. (1971). Photosynthetic uptake of free CO2 by the roots of Lobelia dortmanna. Plantarum, 25, 245–8.〕 It also has CAM photosynthesis, which is more typical of desert plants.〔Boston, H. L. (1986). A discussion of the adaptation for carbon acquisition in relation to the growth strategy of aquatic isoetids. ''Aquatic Botany'', 26, 259–70.〕
==Distribution==
''L. dortmanna'' is native to cool temperate regions of northern Europe (the British Isles and northwest France east to northwest Russia) and northern North America (both coasts; Newfoundland south to New Jersey and west to the Great Lakes in the east, and British Columbia south to Oregon in the west).〔Flora Europaea: (''Lobelia dortmanna'' )〕〔Germplasm Resources Information Network: (''Lobelia dortmanna'' )〕
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