Proceedings of the Botanical Society of the British Isles (1596)
Botanical Society of the British Isles · London · leaf 425
longated; flowering stem 20-60 cm. long; leaves ribbon- like, 40-60 cm. long and 0-41-4 cm. wide but dilated at the base, nerves all parallel. (b) forma arcuatum (Michalet sensu stricto) Tournay & Lawalree (1949) (A. arcuatum Michalet (1854)). Plant not submerged; flowering stem 10-25 cm. tall;… … Fig. 1. Alisma gramineum — British localities of subsp. gramineum in relation to its distribution in Europe and part of North Africa (enclosed in continuous black line), and to the distribution of subsp. mahlenbergii (dotted line).
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