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Margriet Wetherwax & Dieter H. Wilken, family description, key to genera

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.
± 60 genera, 1700 species: worldwide, especially northern temperate, tropical mountains; many ornamental (Adonis, Aquilegia, Clematis, Consolida, Delphinium, Helleborus, Nigella). some highly TOXIC (Aconitum, Actaea, Delphinium, Ranunculus). [Whittemore & Parfitt 1997 FNANM 3:85–271] Taxa of Isopyrum in TJM (1993) moved to Enemion; Kumlienia moved to Ranunculus. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Ranunculaceae


Alan T. Whittemore

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.
± 300 species: worldwide except lowland tropics; some ornamental. (Latin: small frog, from wet habitats)
Unabridged etymology: (Latin: diminutive of Rana, frog, from wet habitats)

Key to Ranunculus

R. orthorhynchus Hook.
Perennial herb 15–50(85) cm, ± erect or decumbent, not rooting at nodes. Leaf: basal, proximal cauline 2.8–12.5 mm, 2.5–14 cm wide, ultimate segments round to linear, entire to dentate or crenate, tip rounded to narrowly acute; distal cauline much-reduced, deeply parted or compound. Flower: receptacle bristly; sepals 5, reflexed 1–2 mm from base, 5–11 mm, 2–4 mm wide, early-deciduous; petals 5–6, 8–18 mm, yellow or red abaxially, yellow adaxially. Fruit: body 2.8–4.5 mm, disk-like, wall thick, smooth, beak 1.8–3.8(4.8) mm, straight, narrowly lanceolate to awl-shaped. [Online Interchange]

R. orthorhynchus var. orthorhynchus
Leaf: basal leaves narrowly ovate to semicircular, 1-ternate or -pinnate, leaflets 3–5, 1–2 × lobed or parted, segments elliptic to linear, entire to dentate-lobed, obtuse to narrowly acute. Flower: petals 4–6 mm wide, rounded, generally red abaxially. Fruit: beak 3–3.8(4.8) mm; aggregate 5–7 mm, hemispheric, occasionally spheric.
Meadows, marshy areas; < 2200 m. Northwestern California, High Cascade Range, High Sierra Nevada, Modoc Plateau; to Alaska. [Ranunculus orthorhynchus var. hallii Jeps.] Mar–Aug [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Ranunculus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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click for enlargement Ranunculus orthorhynchus var. orthorhynchus
See CalPhotos for additional images
2000 Gary A. Monroe

Geographic subdivisions indicated for the distribution of Ranunculus orthorhynchus var. orthorhynchus Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.