Difference between revisions of "Hydrocharis morsus-ranae"
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| − | --><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> to 20 cm. <b>Rhizomes</b> absent; stStolon buds with 1 root. <b>Leaves</b> floating or, in dense vegetation, emergent; blade 1.2–6 × 1.3–6.3 cm; primary veins forming 75–90° angle with midvein, broadly curving, aerenchyma confined to midvein region (not margin to margin as in Limnobium), individual aerenchyma space (located ca. 1 mm from either side of midvein) 0.1–0.5 mm across its longest axis, 0.1–0.5 mm wide, 1 mm from midvein. <b>Flowers</b>: staminate flowers 1–5 in each spathe; pedicel to 4 cm; stamens 9–12 in 4 whorls; filaments basally not obviously connate; pistillate flowers solitary; pedicels to 9 cm; styles 2-fid for less than ½ length. <b>Seeds</b> 1–1.3 mm. <b>2n</b> = 28 (Netherlands).</span><!-- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> to 20 cm. <b>Rhizomes</b> absent; stStolon buds with 1 root. <b>Leaves</b> floating or, in dense vegetation, emergent; blade 1.2–6 × 1.3–6.3 cm; primary veins forming 75–90° angle with midvein, broadly curving, aerenchyma confined to midvein region (not margin to margin as in <i>Limnobium</i>), individual aerenchyma space (located ca. 1 mm from either side of midvein) 0.1–0.5 mm across its longest axis, 0.1–0.5 mm wide, 1 mm from midvein. <b>Flowers</b>: staminate flowers 1–5 in each spathe; pedicel to 4 cm; stamens 9–12 in 4 whorls; filaments basally not obviously connate; pistillate flowers solitary; pedicels to 9 cm; styles 2-fid for less than ½ length. <b>Seeds</b> 1–1.3 mm. <b>2n</b> = 28 (Netherlands).</span><!-- |
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|elevation=10–50 m | |elevation=10–50 m | ||
|distribution=Ont.;Que.;N.Y.;Eurasia. | |distribution=Ont.;Que.;N.Y.;Eurasia. | ||
| − | |discussion=<p>Hydrocharis morsus-ranae was planted in ponds beside Dow’s Lake in the Central Experimental Farm Arboretum at Ottawa in 1932 (P. M. Catling and W. G. Dore 1982). It apparently escaped from these ponds; by 1939 it was found in the Rideau Canal and by 1967 in the St. Lawrence River from Montreal as far as Lake St. Peter. It had spread into Lake Ontario, Lake Erie, and a couple of localities in New York (Catling and Dore 1982).</p> | + | |discussion=<p><i>Hydrocharis morsus-ranae</i> was planted in ponds beside Dow’s Lake in the Central Experimental Farm Arboretum at Ottawa in 1932 (P. M. Catling and W. G. Dore 1982). It apparently escaped from these ponds; by 1939 it was found in the Rideau Canal and by 1967 in the St. Lawrence River from Montreal as far as Lake St. Peter. It had spread into Lake Ontario, Lake Erie, and a couple of localities in New York (Catling and Dore 1982).</p> |
|tables= | |tables= | ||
|references={{Treatment/Reference | |references={{Treatment/Reference | ||
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|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V22/V22_382.xml |
|genus=Hydrocharis | |genus=Hydrocharis | ||
|species=Hydrocharis morsus-ranae | |species=Hydrocharis morsus-ranae | ||
Revision as of 16:58, 18 September 2019
Herbs, to 20 cm. Rhizomes absent; stStolon buds with 1 root. Leaves floating or, in dense vegetation, emergent; blade 1.2–6 × 1.3–6.3 cm; primary veins forming 75–90° angle with midvein, broadly curving, aerenchyma confined to midvein region (not margin to margin as in Limnobium), individual aerenchyma space (located ca. 1 mm from either side of midvein) 0.1–0.5 mm across its longest axis, 0.1–0.5 mm wide, 1 mm from midvein. Flowers: staminate flowers 1–5 in each spathe; pedicel to 4 cm; stamens 9–12 in 4 whorls; filaments basally not obviously connate; pistillate flowers solitary; pedicels to 9 cm; styles 2-fid for less than ½ length. Seeds 1–1.3 mm. 2n = 28 (Netherlands).
Phenology: Flowering spring–fall.
Habitat: Ponds, bays of rivers
Elevation: 10–50 m
Distribution
Ont., Que., N.Y., Eurasia.
Discussion
Hydrocharis morsus-ranae was planted in ponds beside Dow’s Lake in the Central Experimental Farm Arboretum at Ottawa in 1932 (P. M. Catling and W. G. Dore 1982). It apparently escaped from these ponds; by 1939 it was found in the Rideau Canal and by 1967 in the St. Lawrence River from Montreal as far as Lake St. Peter. It had spread into Lake Ontario, Lake Erie, and a couple of localities in New York (Catling and Dore 1982).