Nuphar microphylla

(Persoon) Fernald

Rhodora19: 111. 1917 (as microphyllum)

Common names: Petit nénuphar jaune
Synonyms: Nuphar kalmiana Nuphar minima
Basionyms: Nymphaea microphylla
Found in FNA Volume 3.
FNA03 P12 Nuphar pg 69.jpeg
Rhizomes 1-2 cm diam. Leaves mostly floating, occasionally submersed; petiole flattened to filiform. Leaf blade abaxially often purple, adaxially green to greenish purple, broadly elliptic to ovate, 3.5-10(-13) × 3.5-7.5(-8.5) cm, 1-1.5 times as long as wide, sinus 2/3 or more length of midrib, lobes divergent and forming V-shaped angle; surfaces abaxially glabrous to densely pubescent. Flowers 1-2 cm diam.; sepals 5(-10), abaxially green to adaxially yellow toward base; petals broadly spatulate and thin, or notched and thickened; anthers 1-3 mm, shorter than filaments. Fruit yellow, green, brown, or rarely purple, mostly globose-ovoid, occasionally flask-shaped, 1-2 cm, smooth basally, faintly ribbed toward apex, deeply constricted below stigmatic disk, constriction 1.5-5 mm diam.; stigmatic disk red, 2.5-7 mm diam., with 6-10 deep crenations; stigmatic rays 6-11, linear, terminating 0-0.2 mm from margin of disk. Seeds ca. 3 mm. 2n = 34.

Phenology: Flowering summer–early fall.
Habitat: Ponds, lakes, sluggish streams, sloughs, ditches, and occasionally tidal waters
Elevation: 0-400 m

Distribution

Man., N.B., N.S., Ont., Que., Conn., Maine, Mass., Mich., Minn., N.H., N.J., N.Y., Pa., Vt., Wis., Europe, n Asia.

Discussion

Intermediates between Nuphar microphylla and N. variegata, probably of hybrid origin, are treated as N. rubrodisca. A form with ten sepals (Nuphar microphyllum forma multisepalum Lakela) occurs in northeastern Minnesota. Recent observations of the Eurasian N. pumila (Timm) de Candolle by C. B. Hellquist in Siberia suggest that Beal's lumping of N microphylla under N. lutea subsp. pumila (Timm) E. O. Beal should be further studied.

References

None.

Facts about "Nuphar microphylla"
AuthorJohn. H. Wiersema + and C. Barre Hellquist +
BasionymNymphaea microphylla +
Common namePetit nénuphar jaune +
Elevation0-400 m +
HabitatPonds, lakes, sluggish streams, sloughs, ditches, and occasionally tidal waters +
IllustratorJohn Myers +
PhenologyFlowering summer–early fall. +
ReferenceNone +
SynonymNuphar kalmiana + and Nuphar minima +
Taxon nameNuphar microphylla +
Taxon parentNuphar +
Taxon rankspecies +
VolumeVolume 3 +