FAMILY: Potamogetonaceae (Zosteraceae, Najadaceae)
HABIT: Submersed dimorphic aquatic, flowering and fruiting
specimens with dilated leaves and occasional winter-buds, sterile specimens
without dilated leaves and with abundant winter-buds, stem filiform, freely
branching, submersed leaves linear-filiform; flowering July-October.
SIMILAR SPECIES: Sterile material without floating leaves
may resemble P. berchtoldii, and can be confused with sterile specimens
of P. pusillus, from which P. vaseyi can be distinguished by the
small inter buds on short branches and the free stipules; plants with floating
leaves can be distinguished from P. spirillus by stipules and flowering
TOTAL RANGE: S. Que. and s. Ont., s. to N.B., ME, MA, PA,
OH, IL, and MN.
STATE RANGE: ASHTABULA CO.: Ashtabula, 24 June 1900, E.
V. South (BGSU); small pond along Conneaut River near Farnham, 12 Aug.
1928, L. E. Hicks (OS,2 sheets). PORTAGE CO.: -----, 13 June 1913, L.
S. Hopkins (KE); S. side of lake, Brady Lake, R. J. Webb 1352 (KE);
Brady Lake, 22 Aug 1913, L. S. Hopkins (OS, 2 sheets). TRUMBULL CO.:
Mosquito Creek, Howland Twp., 4 July 1935, A. Rood & R. Shanks (OS).
STATE STATUS: 1980 to present: Presumed Extirpated.
HABITAT: Quite, muddy or calcareous waters of small lakes at
depths up to 5 m.
HAZARDS: Mechanical disturbance of habitat.
RECOVERY POTENTIAL: Unknown, presumed poor.
INVENTORY GUIDELINES: Every effort should be made to obtain
fruiting specimens; however, in the absence of fertile material, sterile
specimens should be collected.
COMMENTS: While somewhat unlikely, this species, like other
pondweeds, may unexpectedly become established in suitable waters. It should
continue to be sought in northeastern Ohio.
Fernald, M.L. 1932. The linear-leaved North American species
of Potamogeton section Axillares. Mem. Am. Acad. 17: 1-183.
Ohio Department of Natural Resources
Division of Natural Areas and Preserves
Created: 1/1985 John Marshall
Database Code: SPGC.H61