Sparganium angustifolium Michx.
PROTECTED species in Bulgaria.
Sparganium angustifolium is a perennial aquatic herbaceous plant, 12 to 40 inches. The leaves are alternate and basal, all floating on the surface, linear, to 4 feet long, to ¼ inch (2 to 6 mm) wide, hairless, toothless, flat on the upper surface, flat to convex on the lower. The flowers are arranged in round flower heads in a spike-like arrangement at the top of the stem, with separate male and female flower heads on the same plant (monoecious). Flowering July-August.
In the shallow parts of alpine lakes.
In the mountains Pirin and Rila; from 1600 to 2600 m altitude.
 Sparganium angustifolium (Narrow-leaf Bur-reed): Minnesota Wildflowers.
 Йорданов, Д. 1963. В: Флора на Н. Р. България, том I, София.
 Делипавлов & кол. 2003. Определител на растенията в България. Аграрен университет. Пловдив.
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