Aquatic plants of Illinois; an illustrated manual including species submersed, floating, and some of shallow water and muddy shores (1966) (19751945621)

Title: Aquatic plants of Illinois; an illustrated manual including species submersed, floating, and some of shallow water and muddy shores
Identifier: aquaticplantsofi00wint (find matches)
Year: 1966 (1960s)
Authors: Winterringer, Glen Spelman, 1906-; Lopinot, Alvin C
Subjects: Freshwater plants
Publisher: [Springfield Dept. of Registration & Education, Illinois State Museum Division]
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign



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VARIABLE PONDWEED Potamogeton gramineus L. 1 . Submersed leaves 1.5 - 8 cm long, 3 mm to 1 cm wide, narrow, tapering to the base , ihe tips sharp . Veins 3-7. All leaves quite variable. 2. Floating leaves 2-5 cm long, 1 - 2 cm wide, oval to elliptical, thick in texture. Veins 11-19. All leaves variable. 3. Petioles of submersed leaves none. Leaf blade tapering to the base. 4. Petioles of floating leaves 5-10 cm long , slender. 5. Stipules 2-2.5 cm long, tips rounded, persisting . 6. Stem round, slender, often with many branches . 7. Peduncle 2 - 10 cm long , thick- er than the stem . 8. Fruits (achenes) in spike 1 - 3 cm long, cylindrical, dense with achenes . 9. Individual achene 1 .7 - 2.5 mm long, dorsal keel sharp, beak erect. Drawing enlarged 8 times.