Ranunculus spp.
Family: Ranunculaceae
Ranunculus image
Max Licher  
Herbs , annual or perennial, from tuberous roots, caudices, rhizomes, stolons, or bulbous stem bases. Leaves basal, cauline, or both, simple, variously lobed or parted, or compound, all petiolate or distal leaves sessile; cauline leaves alternate (rarely a distal pair opposite in Ranunculus sect. Flammula ). Leaf blade reniform to linear, margins entire, crenate, or toothed. Inflorescences terminal or axillary, 2-50-flowered cymes to 25 cm or solitary flowers; bracts present or absent, small or large and leaflike, not forming involucre. Flowers bisexual, radially symmetric; sepals sometimes persistent in fruit, 3-5(-6), green or sometimes purple, yellow, or white, plane (base saccate in R . ficaria ), oblong to elliptic, ovate, or lanceolate, 1-15 mm; petals 0-22(-150), distinct, yellow, rarely white, red, or green, plane, linear to orbiculate, 1-26 mm; nectary present, usually covered by scale; stamens (5-)10-many; filaments filiform; staminodes absent between stamens and pistils; pistils 4-250, simple; ovule 1 per ovary; style present or absent. Fruits achenes, rarely utricles, aggregate, sessile, discoid, lenticular, globose, obovoid, or cylindric, sides sometimes veined; beak present or absent, terminal, straight or curved, 0-4.5 mm. x = 7, 8. Most Ranunculus species are poisonous to stock; when abundant, they may be troublesome to ranchers. A few species with acrid juice were formerly used as vesicatories. The genus is badly in need of biosystematic work. Apomixis and interspecific hybridization occur in several Old World groups of buttercups; some of the taxonomic complexity of the New World species probably results from these processes. Considerable disagreement exists among authors on the proper generic and infrageneric classification of Ranunculus . Most of the subgenera accepted here have been treated as separate genera at one time or another. All recent studies have been based on local or continental floras, however, and classifications proposed for one region may not work for the plants of other regions. Like most North American workers, I have followed the generic and infrageneric classification of L. D. Benson (1948), who gave by far the most thorough and best documented study of the problem. The genus and its subdivisions should be studied on a worldwide basis.

Image of Ranunculus acer
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Image of Ranunculus aconitifolius
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Image of Ranunculus aduncus
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Ranunculus
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Image of Ranunculus allegheniensis
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Image of Ranunculus allenii
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Image of Ranunculus amellus
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Image of Ranunculus austinae
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Image of Ranunculus bloomeri
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Image of Ranunculus bongardii
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Image of Ranunculus cortusifolius
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Ranunculus
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Image of Ranunculus earlei
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Image of Ranunculus glacialis
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Image of Ranunculus gmelini
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Ranunculus
Image of Ranunculus grandis
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Image of Ranunculus hederaceus
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Image of Ranunculus hesperoxys
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Ranunculus
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Ranunculus
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Ranunculus
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Image of Ranunculus lingua
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Ranunculus
Image of Ranunculus longilobus
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Image of Ranunculus marmorarius
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Image of Ranunculus mexiae
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Ranunculus
Image of Ranunculus monspeliacus
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Image of Ranunculus multifidus
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Image of Ranunculus nodiflorus
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Image of Ranunculus ocreatus
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Ranunculus
Image of Ranunculus ovalis
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Image of Ranunculus pacificus
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Image of Ranunculus peltatus
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Image of Ranunculus pulchellus
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Ranunculus
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Ranunculus
Image of Ranunculus rivularis
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Image of Ranunculus rubrocalyx
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Image of Ranunculus subcordatus
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Image of Ranunculus tenellus
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Image of Ranunculus texensis
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Image of Ranunculus trachycarpus
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Image of Ranunculus trichocarpus
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Image of Ranunculus turneri
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Image of Ranunculus unguiculatus
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Image of Ranunculus verecundus
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Image of Ranunculus wallichianus
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