Flora of North America species comparison

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Potamogeton confervoides

alga pondweed, alga-like pondweed, potamot confervoide, Tuckerman's pondweed
Rhizomes

obvious.
Cauline stems

terete, without spots, 10–80 cm.
Turions

present, in axils of old leaves and from disintegrating branches, fusiform, 0.7–2 cm, leaves spreading to ascending.
Leaves

submersed, ± spirally arranged, flaccid, sessile;

stipules deliquescent, inconspicuous, convolute, free from blade, pale green, not ligulate, 0.5–1.2 cm, not fibrous, not shredding at tip, apex obtuse;

blade pale green, linear, not arcuate, 1.8–6.5 cm × 0.1–0.5 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, extremely attenuate, bristly, lacunae present, each side of midvein to margins;

veins 1.
Inflorescences

unbranched, emersed;

peduncles not dimorphic, terminal, ascending, somewhat clavate, (3–)5–25 cm;

spikes not dimorphic, capitate, 5–12 mm.
Fruits

sessile, light green, round-obovoid or nearly orbicular, compressed, abaxially and laterally keeled, 2–3 × 1.7–2.8 mm, lateral keels without sharp point;

beak erect, 0.5 mm;

sides without basal tubercles;

embryo with less than 1 full spiral.
Chromosome number

apparently unknown not available.

Potamogeton confervoides
Phenology Flowering early–late summer.
Habitat Acidic waters of bogs, ponds, and lakes, often at higher elevation in e portion of range
Elevation 0–1500 m (0–4900 ft)
Distribution
from FNA
CT; MA; ME; MI; NC; NH; NJ; NY; PA; RI; SC; VT; WI; NB; NL; NS; ON; QC; SPM; St Pierre
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[BONAP county map]
Discussion

Potamogeton confervoides is most uncommon and found only in fairly acidic waters. It is easily recognized by its linear, bristly leaves and the unusually long peduncle that seems out of place on a plant with such fine leaves. The leaves are so fine that they almost appear as greenish colored hair in the water. When the plant is removed from the water, the leaves are extremely flaccid leaves and essentially collapse onto each other.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22.
Parent taxa Potamogetonaceae > Potamogeton
Sibling taxa
P. alpinus, P. amplifolius, P. bicupulatus, P. clystocarpus, P. crispus, P. diversifolius, P. epihydrus, P. floridanus, P. foliosus, P. friesii, P. gramineus, P. groenlandicus, P. hillii, P. illinoensis, P. natans, P. nodosus, P. oakesianus, P. oblongus, P. obtusifolius, P. ogdenii, P. perfoliatus, P. praelongus, P. pulcher, P. pusillus, P. richardsonii, P. robbinsii, P. spirillus, P. strictifolius, P. subsibiricus, P. tennesseensis, P. vaseyi, P. zosteriformis
Synonyms P. tuckermanii
Name authority Reichenbach: in H. G. L. Reichenbach et al., Icones florae germanicae et helveticae 7: 13. (1845)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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