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Vascular Plants of California
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Ranunculus glaberrimus


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
Ranunculus glaberrimus Hook.
NATIVE
Habit: Perennial herb 5--26 cm, stem prostrate or ascending, not bulbous-based, glabrous; roots basal, not tuberous. Leaf: basal, occasionally lower cauline persistent. Flower: receptacle glabrous; sepals 5, spreading, 5--8 mm, 3--7 mm wide, early-deciduous; petals 5--10, 8--13 mm, 5--12 mm wide. Fruit: body 1.4--2.2 mm, 1.1--1.8 mm wide, lenticular, wall thick, smooth, beak 0.4--1 mm, straight or curved, lanceolate to awl-shaped.

Unabridged Note: No other varieties.
Jepson eFlora Author: Alan T. Whittemore
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Previous taxon: Ranunculus flammula var. ovalis
Next taxon: Ranunculus glaberrimus var. ellipticus

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Citation for this treatment: Alan T. Whittemore 2012, Ranunculus glaberrimus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=40887, accessed on November 18, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 18, 2019.

Ranunculus glaberrimus
click for enlargement
© 2017 California Academy of Sciences
Ranunculus glaberrimus
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© 1977 Gary A. Monroe
Ranunculus glaberrimus
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© 2008 Steve Matson
Ranunculus glaberrimus
click for enlargement
© 1977 Gary A. Monroe
Ranunculus glaberrimus
click for enlargement
© 1977 Gary A. Monroe
Ranunculus glaberrimus
click for enlargement
© 2017 California Academy of Sciences

More photos of Ranunculus glaberrimus in CalPhotos



Geographic subdivisions for Ranunculus glaberrimus:
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map of distribution 1
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.