Difference between revisions of "Ranunculus aquatilis"

Linnaeus

Sp. Pl. 1: 556. 1753.

Common names: White water crowsfoot renoncule aquatique
Synonyms: Batrachium aquatile (Linnaeus) Dumortier
Treatment appears in FNA Volume 3.
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|name=Batrachium aquatile
 
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|hierarchy=Ranunculaceae;Ranunculus;Ranunculus subg. Batrachium;Ranunculus aquatilis
 
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V3/V3_766.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V3/V3_766.xml
 
|genus=Ranunculus
 
|genus=Ranunculus
 
|subgenus=Ranunculus subg. Batrachium
 
|subgenus=Ranunculus subg. Batrachium

Revision as of 21:31, 16 December 2019

Stems glabrous. Leaves laminate and filiform-dissected; laminate leaf blades reniform, 3-parted, 0.4-1.1 × 0.7-2.3 cm, segments obovate or fan-shaped, shallowly cleft, margins crenate; filiform-dissected leaves with stipules gradually tapering upward, connate for their whole length. Flowers: receptacle hispid, rarely glabrous; sepals spreading or reflexed, 2-4 × 1-2 mm, glabrous; petals 5, 4-7 × 1-5 mm; style 0.1-0.8 mm. Fruiting pedicels usually recurved. Heads of achenes hemispheric to ovoid, 2-4 × 2-5 mm; achenes 1-2 × 0.8-1.4 mm, glabrous or hispid; beak persistent, filiform, 0.1-1.2 mm.

Distribution

North America, Eurasia

Discussion

Varieties 2 (2 in the flora).

Ranunculus aquatilis is very variable. In the past it has often been treated as three or four species and many varieties. These segregate taxa have been based on the size, petiolation and rigidity of the leaves (now known to be primarily under environmental control), petal size and curvature of the fruiting pedicel (both sometimes variable along single stem), and number of achenes per head and length of achene beak (which vary continuously and are not correlated with one another). Unless reliable characters can be found, only two of the taxa recognized in older floras can be maintained.

Selected References

None.

Key

1 Leaves of 2 types: laminate and filiform-dissected; w North America. Ranunculus aquatilis var. aquatilis
1 Leaves all filiform-dissected; widespread. Ranunculus aquatilis var. diffusus