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Ranunculus aquatilis var. diffusus

Higher Taxonomy
Family: RanunculaceaeView DescriptionDichotomous Key

Common Name: BUTTERCUP FAMILY
Habit: Annual, perennial herb, woody vine [shrub], occasionally aquatic. Leaf: generally basal and cauline, alternate or opposite, simple or compound; petioles at base generally flat, occasionally sheathing or stipule-like. Inflorescence: cyme, raceme, panicle, or flowers 1. Flower: generally bisexual, generally radial; sepals 3--6(20), free, early-deciduous or withering in fruit, generally green; petals 0--many, generally free; stamens generally 5--many, staminodes generally 0; pistils 1--many, ovary superior, chamber 1, style 0--1, generally +- persistent as beak, ovules 1--many. Fruit: achene, follicle, berry, +- utricle in Trautvetteria, in aggregate or not, 1--many-seeded.
Genera In Family: +- 60 genera, 1700 species: worldwide, especially northern temperate, tropical mountains; many ornamental (Adonis, Aquilegia, Clematis, Consolida, Delphinium, Helleborus, Nigella). Toxicity: some highly TOXIC (Aconitum, Actaea, Delphinium, Ranunculus). Note: Taxa of Isopyrum in TJM (1993) moved to Enemion; Kumlienia moved to Ranunculus.
eFlora Treatment Author: Margriet Wetherwax & Dieter H. Wilken, family description, key to genera
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: RanunculusView DescriptionDichotomous Key

Common Name: BUTTERCUP
Habit: Annual to perennial herb, occasionally from stolons or caudices, terrestrial or aquatic; roots generally fibrous. Stem: prostrate to erect. Leaf: basal, cauline, or both, alternate, generally reduced upward; petiole base flat, stipule-like or not; basal, proximal cauline petioles generally long; blades simple to dissected or compound, entire to toothed. Inflorescence: cyme, axillary or terminal, 1--few-flowered. Flower: sepals 3--5(6), generally early-deciduous, generally green to yellow or purple; petals 0--17[(150)], shiny, generally yellow, occasionally white or purple, nectaries near base, pocket-like or with flap-like scale; anthers yellow; pistils generally many. Fruit: achene, compressed or not, +- spheric, disk-like (width 3--15 × depth), or lenticular (width 1--2 × depth), beaked.
Species In Genus: +- 300 species: worldwide except lowland tropics; some ornamental. Etymology: (Latin: diminutive of Rana, frog, from wet habitats)
eFlora Treatment Author: Alan T. Whittemore
Species: Ranunculus aquatilisView Description 

Habit: Perennial herb (5)20--80 cm, aquatic or creeping on mud, rooting at nodes. Leaf: submersed or floating and submersed; submersed generally 3--6-dissected; stipules tapered, united. Flower: receptacle bristly; sepals 5, spreading or reflexed, 2--4 mm, 1--2 mm wide, early-deciduous; petals 5, 4--7 mm, 1--5 mm wide, white or white with yellow claws; style 0.2--1.2 mm. Fruit: 15--many, body 1--2 mm, 0.8--1.4 mm wide, lenticular, wall thick, transversely wrinkled, beak persistent, thread-like.


Ranunculus aquatilis var. diffusus With.
NATIVE
Leaf: floating and submersed dissected into thread-like segments. Fruit: body 1--1.8 mm, 0.8--1.2 mm wide, beak 0.2--1.2 mm.
Ecology: Ponds, lakes, streams, river edges; Elevation: < 3200 m. Bioregional Distribution: CA-FP, GB; Distribution Outside California: North America, Eurasia, Australia. Flowering Time: Mar--Sep
Synonyms: Ranunculus aquatilis var. capillaceus (Thuill.) DC.; Ranunculus aquatilis var. harrisii L.D. Benson; Ranunculus aquatilis var. longirostris (Godr.) G. Lawson; Ranunculus aquatilis var. subrigidus (W.B. Drew) Breitung; Ranunculus circinatus Sibth. var. subrigidus (W.B. Drew) L.D. Benson; Ranunculus longirostris Godr.; Ranunculus subrigidus W.B. Drew; Ranunculus trichophyllus Chaix; Ranunculus trichophyllus var. trichophyllus.
eFlora Treatment Author: Alan T. Whittemore
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Citation for this treatment: Alan T. Whittemore 2016. Ranunculus aquatilis var. diffusus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80687, accessed on July 27, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on July 27, 2016.


Ranunculus aquatilis var. diffusus
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© 2008 Keir Morse
Ranunculus aquatilis var. diffusus
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© 2007 Steve Matson
Ranunculus aquatilis var. diffusus
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© 2004 Carol W. Witham
Ranunculus aquatilis var. diffusus
click for enlargement
© 2009 Keir Morse
Ranunculus aquatilis var. diffusus
click for enlargement
© 2009 Keir Morse
Ranunculus aquatilis var. diffusus
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© 2009 Barry Breckling

More photos of Ranunculus aquatilis var. diffusus in CalPhotos


Geographic subdivisions for Ranunculus aquatilis var. diffusus:
CA-FP, GB;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.