STUCKENIA FILIFORMIS (Pers.) Borner
FAMILY: Potamogetonaceae (Zosteraceae, Najadaceae)
HABIT: Submersed aquatic, creeping extensively by filiform
stolons, terminated by slender white tubers; flowering July-September; fruiting
SIMILAR SPECIES: Sterile specimens of Ruppia may be
mistaken for P. filiformis, but differ in that the summit of the open
sheathing leaf bases of Ruppia are at most slightly auriculate as
opposed to having definite free stipules.
TOTAL RANGE: Circumboreal; in America s. to ME, PA, OH, MI,
MN, and AZ.
STATE RANGE: There is a post-1960 record from Ottawa
County. Pre-1960 occurrences are recorded for Auglaize, Mercer, and Miami
STATE STATUS: 1980-1991: Endangered, 1992 to present:
HABITAT: Lakes and rivers, at depths up to at least a meter,
but apparently fruiting best in shallow water over a sandy bottom.
HAZARDS: Unknown, but perhaps turbidity or mechanical
RECOVERY POTENTIAL: Probably poor. However, improved water
quality may lead to establishment of additional populations. The species may
likely never be well established in Ohio, owing to the warm waters of the
INVENTORY GUIDELINES: Every effort should be made to obtain
fruiting specimens; however, in the absence of fruiting material, sterile
specimens should be collected.
COMMENTS: While somewhat unlikely, this species, like other
pondweeds, may unexpectedly become established in suitable waters. It should be
sought in northern and western Ohio.
species is not reported in Braun (1967). However, good keys for the northern
pondweeds, including P. filiformis, can be found in Voss (1972), and
Hellquist and Crow (1980).
Braun, E.L. 1967. The Monocotyledoneae of Ohio : Cat-tails
to orchids. The Ohio State University Press, Columbus, OH. 464 p.
Fernald, M.L. 1932. The linear-leaved North American species
of Potamogeton, section Axillares. Mem. Am. Acad. 17: 1-183.
Hellquist, C.B. 1977. Observations on some uncommon vascular
aquatic plants in New England. Rhodora 79: 445-452.
Hellquist, C.B. and G.E. Crow. 1980. Aquatic vascular plants
of New England: Part l. Zosteraceae, Potamogetonaceae, Zannichelliaceae,
Najadaceae. New Hampshire Agr. Exp. Sta. Bull. 515. 68 p.
Ogden, E.C. 1974. Potamogeton in New York. New York
St. Museum Bull. No. 423, Albany, NY. 20 p.
Voss, E.G. 1972. Michigan flora, Part I. Gymnosperms and
monocots. Cranbrook Inst. of Sci. Bull. 55, Bloomfield Hills, MI. 488 p.
Ohio Department of Natural Resources
Division of Natural Areas and Preserves
Created: 11/1983 John Marshall