Contains 18 accepted taxa overall.
Characteristics
Classification
Citation
RANUNCULUS Linnaeus, Sp. Pl. 548. 1753.
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TYPE: Ranunculus auricomus Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 104. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ranunculus abortivus | Kidneyleaf Buttercup | |||
| Ranunculus acris | Tall Buttercup, Bitter Buttercup | |||
| Ranunculus allegheniensis | Allegheny Buttercup, Mountain Crowfoot | |||
| Ranunculus arvensis | Corn Crowfoot, Hungerweed | |||
| Ranunculus bulbosus | Bulbous Buttercup | |||
| Ranunculus fascicularis | Thick-root Buttercup, Early Buttercup | |||
| Ranunculus hispidus | Hispid Buttercup, Hairy Buttercup | |||
| Ranunculus laxicaulis | Coastal Plain Spearwort | |||
| Ranunculus muricatus | Spinyfruit Buttercup | |||
| Ranunculus parviflorus | Small-flowered Buttercup, Stickseed Crowfoo | |||
| Ranunculus platensis | Prairie buttercup | |||
| Ranunculus pusillus | Low Spearwort | |||
| Ranunculus recurvatus var. recurvatus | Hooked Buttercup, Hooked Crowfoot | |||
| Ranunculus repens | Creeping Buttercup, Meg-many-feet | |||
| Ranunculus sardous | Sardinian Buttercup, Hairy Buttercup | |||
| Ranunculus sceleratus var. sceleratus | Cursed Buttercup, Celery-leaf Crowfoot | |||
| Ranunculus septentrionalis | Carolina Buttercup | |||
| Ranunculus trilobus | Threelobe Buttercup |
Identification Key
1. All leaf blades entire, undulate, to toothed (rarely lobed or compound)
2
1. At least some leaf blades distinctly lobed (sinuses at least ½ the blade length), divided, or compound, the basal ones sometimes unlobed or undivided
3
2. Petals 4-6, 2-6 mm long; achene 0.8-1 mm long
2. Petals 1-3, 1.5-2.5 mm long; achene 1-1.2 mm long
3. Basal leaves mostly crenate and unlobed
3. Basal leaves lobed, divided, or with coarse teeth
4
4. Flowers sessile, opposite the leaves
4. Flowers pedicellate, axillary
5
5. Fruiting head ellipsoid
5. Fruiting head globose
6
6. Petals 1-2 mm long; achene with hooked bristles
6. Petals 3-12 mm long; achene lacking bristles
7
7. Petals 7-12 mm long
8
7. Petals 3-8 mm long
10
8. Sepals reflexed along well-defined transverse fold 1-3 mm above base; styles laterally stigmatic; achene beak 0.4-0.7 mm long
8. Sepals spreading, sometimes reflexed from base with age; styles stigmatic only at the tip; achene beak 0.8-2.6 mm long
9
9. Stems erect or nearly erect, never rooting at nodes
9. Stems decumbent, sometimes rooting at nodes
10. Petals 3-5 mm long; achene face smooth
10. Petals 4-8 mm long; achene face tuberculate to spiny
11
11. Achene face with low rounded protuberuances; achene beak 0.3–0.7 mm
11. Achene face with spiny protuberances; achene beak 1–2.5 mm
12
12. Peduncle usually longer than the subtending leaf; achene faces but not margin covered with high sharp tubercles or low spines; achene beak ca. 1 mm long
12. Peduncle usually subequal to shorter than the subtending leaf; achene faces but not margin covered with long spines; achene beak 2–2.5 mm long
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||