PERFOLIATUS L. var. BUPLEUROIDES (Fern.) Farwell
FAMILY: Potamogetonaceae (Zosteraceae, Najadaceae)
SYNONYMS: Potamogeton perfoliatus L. subsp. bupleuroides
HABIT: Submersed aquatic arising from a white
rhizome; flowering and fruiting July-October; seldom fruiting in the southern
part of its range, including Ohio.
SIMILAR SPECIES: Non-fruiting specimens are easily confused
with Potamogeton praelongus or P. richardsonii. These closely
related species are difficult to identify unless mature fruit are present.
TOTAL RANGE: Nfld. to Ont., s. to NY, NC, PA, and
OH; also along the Gulf Coast from FL to LA; the typical variety is
circumboreal in North America and Eurasia.
STATE RANGE: COSHOCTON CO.: Ohio Canal near Roscoe, n.d. ca.
1835 , J.L. Riddell (CINC, GH, US). OTTAWA CO.: Put-in-bay, Aug. 1898, A.J.
Pieters (US). See Comments below for a discussion of these specimens.
STATE STATUS: 1980 to present: Presumed Extirpated.
HABITAT: Calcareous to brackish waters of lakes and streams.
HAZARDS: Mechanical disturbance of substrate; alteration of
RECOVERY POTENTIAL: Unknown, but probably poor.
INVENTORY GUIDELINES: Collect mature fruiting specimens if
possible; leave rhizome intact; while vegetative material is difficult to
identify, this species fruits so rarely that the collector may have no
alternative to gathering sterile material.
COMMENTS: Although is species is listed for Ohio by most manuals;
all the Ohio specimens actually may be referred to Potamogeton richardsonii.
Ogden (1943) cited the specimens listed above as P. perfoliatus.
However, Ogden later changed his opinion. In a letter quoted in Braun (1967, p.
41) Ogden stated that all the Ohio material was intermediate between P. perfoliatus
and P. richardsonii "but...closer to P. richardsonii."
The specific boundaries between these species of pondweed and the related P.
praelongus are very unclear. Many specimens appear to be hybrids or
Braun, E.L. 1967. The Monocotyledonae of Ohio : Cat-tails to
orchids. The Ohio State Univ. Press,
Columbus, OH. 464 p.
Hellquist, C.B. and G.E. Crow. 1980. Aquatic Vascular plants
of New England: Part 1. Zosteraceae, Potamogetonaceae, Zannichelliaceae,
Najadaceae. New Hampshire Agric. Exp. Sta., Durham, NH. 68 p.
Ogden, E.C. 1943. The broad-leaved species of Potamogeton
of North America, north of Mexico. Rhodora 45: 57-105, 119-163, 171-214.
Ogden, E.C. 1974. Potamogeton in New York. New York
St. Mus. Bull. No. 43. 20 p.
Ohio Department of Natural Resources
Division of Natural Areas and Preserves
Created: 3/1985 Allison W. Cusick
Database Code: SPGC.H55