Alisma plantago-aquatica

Linnaeus

Sp. Pl. 1: 342. 1753.

Introduced
Treatment appears in FNA Volume 22.

Herbs, to 1 m. Leaves emersed, petiolate; blade linear-lanceolate to broadly elliptic to ovate, to 30 × 1–12 cm. Inflorescences to 1 m. Flowers chasmogamous; sepals 1.7–3.2 mm; petals purplish white to purplish-pink, 3.4–6.4 mm, margins erose, apex obtuse; anthers ellipsoid, 0.7–1.4 mm; style straight, 0.6–1.5 mm, exceeding ovary length. Fruiting heads 4–6.5 mm diam; achenes ovoid, 1.7–3.1 mm, abaxial keels broadly rounded, with 1 median abaxial groove, rarely 2, beak erect or nearly erect. 2n = 14 (Eurasian material).


Phenology: Flowering and fruiting late summer.
Habitat: Stream margins
Elevation: 200 m

Distribution

V22 221-distribution-map.jpg

Introduced; Alaska, Eurasia

Discussion

The name Alisma plantago-aquatica has been used in a variety of North American floras. We are following, however, the treatment of I. Björkqvist (1968), in which the native distribution of A. plantago-aquatica is restricted to Eurasia.

Lower Taxa

None.

... more about "Alisma plantago-aquatica"
ellipsoid +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Robert R. Haynes +  and C. Barre Hellquist +
Linnaeus +
attenuate;rounded +
0 cm0 mm <br />0 m <br /> (30 cm300 mm <br />0.3 m <br />) +
linear-lanceolate +  and broadly elliptic +
1cm +  and 12cm +
lanceolate +
Alaska +  and Eurasia +
u--shaped +
subsessile +  and long-pedicellate +
hypogynous +
compressed +
Stream margins +
decumbent +  and floating +
0 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
submersed +  and emersed +
decumbent +  and floating +
deciduous +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.64 cm6.4 mm <br />0.0064 m <br />) +
triangular +
Flowering and fruiting late summer. +
not radiating +
decumbent +  and floating +
fernald1946a +
not septate +
persistent +
not sculptured +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Introduced +
straight +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Alisma plantago-aquatica +
species +
emersed +  and submersed +
bracteolate +  and branching +